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Symmetry Breaking Driven Ultralow Thermal Conductivity in Simple Diamond-Like Crystal 认领 引用
1
作者 Yulou Ouyang Ruoyu Wei +3 位作者 Rong Zeng Zhenkun Tang Zhongwei Zhang Jie Chen 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第5期380-393,共14页
Achieving ultralow lattice thermal conductivity(κl)in simple crystals remains challenging without complex chemistry or microanostructure engineering.In this work,we demonstrate that symmetry breaking is an effective ... Achieving ultralow lattice thermal conductivity(κl)in simple crystals remains challenging without complex chemistry or microanostructure engineering.In this work,we demonstrate that symmetry breaking is an effective approach to control thermal transport in diamond-like A(X-Y)2(A=Si,Ge;X/Y=C,B,N)simple crystals,ultimately leading to an ultralowκl.In particular,Ge(B-N)2exhibits an ultralowκl of 1.52 W·m-1·K-1at 300 K and 0.85 W·m-1·K-1at 800 K,comparable to that of amorphous materials.Based on Wigner theory of thermal transport,we decomposeκl into the population(particle-like)κp and the coherence(wave-like)κc contributions.By introducing symmetry breaking,the uniform bond-strength network is redistributed,which enhances anharmonic phonon scattering and shortens phonon lifetimes,leading to a reduction of up to 64%in room-temperatureκp in Ge(B-N)2compared with symmetry-preserved Ge(C-C)2.With the strong suppression of particle-like phonons,the wave-like contributions become increasingly important,with theκc/κp ratio reaching~90%at 800 K in Ge(B-N)2.This study provides a novel strategy for designing materials with tailored thermal conductivity,which has potential applications in the development of thermoelectric materials. 展开更多
关键词 diamond crystals control thermal transport symmetry breaking amorphous materialsbased complex chemistry ultralow lattice thermal conductivity l ultralow thermal conductivity thermal conductivity
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Ultrahigh Lattice Thermal Conductivity in 2D Magnetic VSi2N4Driven by Exceptional Stiffness 认领 引用
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作者 Zhunyun Tang Xiaoxia Wang +6 位作者 Shaogang Peng Tao Ouyang Jin Li Chaoyu He Mingxing Chen Junjie He Chao Tang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第6期140-140,141-146,I0132-I0137,共1页
Two-dimensional(2D)magnetic semiconductors are promising candidates for next-generation spintronic,memory,and logic devices.However,their practical deployment is often hindered by poor heat dissipation due to the low ... Two-dimensional(2D)magnetic semiconductors are promising candidates for next-generation spintronic,memory,and logic devices.However,their practical deployment is often hindered by poor heat dissipation due to the low lattice thermal conductivity(κL).Herein,we identify a 2D ferromagnetic semiconductor,VSi2N4,that exhibits an ultrahighκL.Using first-principles calculations combined with the MACE machine learning potential and the phonon Boltzmann transport equation,we reveal that the room-temperatureκL of VSi2N4 is about 317 W m−1 K−1.This value is one order of magnitude higher than that of most known 2D magnets and represents the highestκL reported in these materials.This superior thermal transport mainly originates from the large phonon group velocity and weak phonon-phonon scattering.Notably,even with the inclusion of four-phonon scattering,theκL reduction is merely approximately 8.3%,indicating limited high-order anharmonicity.Meanwhile,our analysis further reveals that theκL value of VSi2N4 significantly deviates from the conventional scaling trends established by Slack based on the number of atoms per unit cell and the average atomic mass.Nevertheless,a clear positive correlation is established with the Young’s modulus,underscoring mechanical stiffness as an effective descriptor for superior thermal transport in 2D systems.The exceptional stiffness of VSi2N4 is attributed to the strong bonding resulting from the highly localized charge distribution between the Si and N atoms.These findings presented in this work not only reveal VSi2N4 as a unique platform integrating robust ferromagnetism with outstanding heat dissipation,but also provide crucial guidance for the thermal manage-ment of future high-performance 2D magnetic materials. 展开更多
关键词 phonon group velocity VSi N mace machine learning potential d ferromagnetic semiconductorvsi n phonon boltzmann transport equationwe low lattice thermal conductivity l hereinwe heat dissipation D magnetic semiconductors
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Analytical equations for thermal and electrical conductivity prediction in as-cast magnesium alloys:A symbolic regression approach 认领 引用
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作者 Junwei Chen Jun Luan +3 位作者 Shuai Jiang Zhigang Yu Yunying Fan Kuochih Chou 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第1期490-504,共15页
The thermal and electrical conductivities of magnesium alloys are highly sensitive to composition and microstructure,with thermal conductivity varying by up to 20-fold across different as-cast alloy systems,making rap... The thermal and electrical conductivities of magnesium alloys are highly sensitive to composition and microstructure,with thermal conductivity varying by up to 20-fold across different as-cast alloy systems,making rapid and accurate prediction crucial for high-throughput screening and development of high-performance alloys.This study introduces a physics-informed symbolic regression approach that addresses the limitations of traditional methods,including the high computational cost of first-principles calculations and the poor interpretability of machine learning models.Comprehensive datasets comprising 1512 data points from 60 literature sources were analyzed,including thermal conductivity measurements from 52 alloy systems and electrical conductivity measurements from 36 systems.The derived symbolic regression model achieved Mean Absolute Percentage Errors(MAPEs)of 11.2%and 11.4%for thermal conductivity in low and high-component systems,respectively.When integrated with the Smith-Palmer equation,electrical conductivity predictions reached MAPEs of 15.6%and 16.4%.Independent validation on an entirely separate dataset of 554 data points from 53 additional literature sources,including 37 previously unseen alloy systems,confirmed model generalizability with MAPEs of 10.7%-15.2%.Shapley Additive Explanations(SHAP)analysis was employed to evaluate the relative importance of different features affecting conductivity,while equation decomposition quantified the contribution of individual functional terms.This methodology bridges data-driven prediction with mechanistic understanding,establishing a foundation for knowledge-based design of magnesium alloys with tailored transport properties. 展开更多
关键词 Electrical conductivity Interpretable modeling Magnesium alloys Symbolic regression Thermal conductivity
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Enhanced ionic conductivity and grain boundary conduction behavior of YSZ-LSGM heterostructure composite electrolyte for SOFCs 认领 引用
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作者 Cui Qiao Jie Yu +5 位作者 Guoqiang Lv Shaoyuan Li Jijun Lu Fengshuo Xi Zhongqiu Tong Wenhui Ma 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第6期1846-1857,I0006,共12页
Y0.15Zr0.85O1.93(YSZ)has emerged as a crucial solid electrolyte material for modern solid oxide fuel cells(SOFCs)and oxygen sensors,prized for its exceptionally high oxygen ionic conductivity.However,further ... Y0.15Zr0.85O1.93(YSZ)has emerged as a crucial solid electrolyte material for modern solid oxide fuel cells(SOFCs)and oxygen sensors,prized for its exceptionally high oxygen ionic conductivity.However,further enhancement of its oxygen ionic conductivity is essential to optimize SOFCs energy efficiency and mitigate high-temperature electrode degradation.Despite extensive efforts involving various doping strategies,this critical challenge remains unsolved.To address this issue,a novel YSZ-LSGM heterostructure composite electrolyte was developed by adding a minor La0.9Sr0.1Ga0.8Mg0.2O2.85(LSGM)phase into the YSZ phase,and its performance as an electrolyte was systematically evaluated.LSGM's high ionic conductivity promotes rapid oxygen ion transport across grain boundaries.The heterogeneous interface between YSZ and LSGM also favors oxygen ion transport,significantly enhancing both the grain boundary conductivity and the total ionic conductivity of the heterostructure composite.Remarkably,the YSZ-30 wt%LSGM composite demonstrates approximately 8 times in total conductivity(0.0008 S/cm at 750℃)compared to pure YSZ(0.0001 S/cm at 750℃).Most strikingly,the YSZ-30 wt%LSGM's grain boundary conductivity is around 24 times higher than the YSZ electrolyte's.These findings highlight the synergistic advantages of the heterostructure composite electrolyte,which combines the excellent compatibility of YSZ with the superior ionic conductivity of LSGM.This study not only provides a promising strategy for developing advanced composite electrolyte materials but also opens a new avenue for further research in high-performance SOFC technologies. 展开更多
关键词 YSZ-LSGM composite electrolyte Solid oxide fuel cells Ionic conductivity Grain boundary conduction Heterogeneous interface Rare earths
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Exploration of Interfacial Conductivity and Magnetism in Manganite/Cuprate Heterostructures 认领 引用
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作者 Bo Du Gangfan Chen +8 位作者 Yichi Zhang Guangyu Xi Jingyi Shen Yiwei Gu Yuan Liu Tianshuang Ren Chuanyu Shi Yanwu Xie Jie Wu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第2期210-216,共7页
Superconductivity emerging at the interface of heterostructures provides a unique platform to study and control superconductivity at the two-dimensional limit and offers a promising avenue for discovering new supercon... Superconductivity emerging at the interface of heterostructures provides a unique platform to study and control superconductivity at the two-dimensional limit and offers a promising avenue for discovering new superconducting materials.By adjoining an undoped cuprate layer,such as La2CuO4(LCO) and SrCuO2(SCO),with a hole-doped La1-xSrxMnO3(LSMO)layer,we systematically investigate the conductivity and magnetism of manganite/cuprate heterostructures while varying the LSMO doping level from 0.33 to 0.80 to tune LSMO from a ferromagnetic metal to an antiferromagnetic insulator.Driven by the difference in work functions,charges are transferred from the LSMO layer to the cuprate layer,thereby giving rise to a conducting interfacial layer when the LSMO layer is heavily doped.No signature of interface superconductivity is observed in any of the synthesized heterostructures,a behavior likely attributable to spin-polarized charge transfer and the competition between superconductivity and magnetism.Our findings provide valuable insights into the mechanism of interface superconductivity as well as guidelines for the search for emergent interfacial effects. 展开更多
关键词 doping level spin polarized charge transfer study control superconductivity interfacial conductivity magnetism superconducting materialsby manganite cuprate heterostructures undoped cuprate layersuch
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Superionic Conduction Through Lattice Engineering of Fluorites Stabilizing Periodic Oxygen Vacancy Network 认领 引用
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作者 Shahzad Rasool Muhammad Faisal Anwar +16 位作者 Sarfraz Nabeela Akbar Wei Zhou Shuo Wan Rizwan Raza Muhammad Afzal Li Sun Chenjie Lou Mingxue Tang Aristides D.Zdetsis Hind Himayyid Aljaddani Mohamed Elfleet Peter D.Lund Muhammad Imran Asghar Yifu Jing Qi Fan Bin Zhu 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2026年第3期536-545,共10页
Superionic conductors with an exceptionally high ionic conductivity are placed central in the development of next-generation energy conversion and storage technologies,yet their designing approach and materials remain... Superionic conductors with an exceptionally high ionic conductivity are placed central in the development of next-generation energy conversion and storage technologies,yet their designing approach and materials remain a persistent challenge.Here,we report an alternative cation-ordered Ce-Al(1:1)fluorite oxide(ACO)that stabilizes a periodic oxygen vacancy(Ov)network to build the required architecture.The resulting lattice-engineered configuration creates a uniform and flattened potential energy landscape with significantly reduced activation energy,capable of a superionic conductivity of 0.216 S cm⁻¹ and a fuel cell power density of 1086 mW cm⁻² at 500℃.Unlike conventional random ion hopping in doped oxides,the vacancy-ordered framework supports coherent,phonon-assisted and wave-like ion motion enabling dielectric-enhanced superionic conduction.These findings introduce a new family of superionic conductors,where lattice-level ordering of both cations and Ovs offers a scalable design strategy for high-performance efficient electrochemical systems. 展开更多
关键词 dielectric-enhanced superionic conduction lattice-engineered configuration periodic oxygen vacancy superionic conductors vacancy-ordered framework
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Thermal and Electrical Conductivities of Aluminum Up to 1000 eV:A First-Principles Prediction 认领 引用
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作者 Qianrui Liu Xiantu He Mohan Chen 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第7期55-58,I0024-I0036,共4页
Accurate prediction of the thermal and electrical conductivities of materials under extremely high temperatures is essential in high-energydensity physics.These properties govern processes such as stellar core dynamic... Accurate prediction of the thermal and electrical conductivities of materials under extremely high temperatures is essential in high-energydensity physics.These properties govern processes such as stellar core dynamics,planetary magnetic field generation,and laserdriven plasma evolution.However,first-principles methods like Kohn-Sham(KS)density functional theory(DFT)face challenges in predicting these properties due to prohibitively high computational costs.We propose a scheme that integrates the Kubo formalism with a mixed stochastic-deterministic DFT(mDFT)method,which substantially enhances efficiency in computing thermal and electrical conductivities of dense plasmas under extremely high temperatures.As a showcase,this approach enables ab initio calculations of the thermal and electrical conductivities of aluminum(Al)up to 1000 eV.Compared to traditional transport models,our first-principles results reveal significant deviations in the thermal and electrical conductivities of Al within the warm dense matter regime,underscoring the importance of accounting for quantum effects when investigating these transport properties of warm dense matter. 展开更多
关键词 kubo formali functional theory dft face thermal electrical conductivities laserdriven plasma evolutionhoweverfirst principles aluminum first principles prediction thermal conductivity stellar core dynamicsplanetary magnetic field generationand
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Generalized semi-analytical modeling of three-dimensional contact responses in piezoelectric semiconductors with conductive indenters 认领 引用
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作者 Ling WANG Huoming SHEN Yuxing WANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2026年第3期555-572,共18页
Piezoelectric semiconductor(PSC)materials exhibit strong electromechanical coupling affected by free carriers,which makes their contact behavior essential for sensors,actuators,and electronic devices.Analytical models... Piezoelectric semiconductor(PSC)materials exhibit strong electromechanical coupling affected by free carriers,which makes their contact behavior essential for sensors,actuators,and electronic devices.Analytical models for three-dimensional(3D)PSC contact problems are still scarce,especially for conductive indenters.This work develops a semi-analytical framework to study the 3D frictionless contact between a conductive indenter and a PSC half-space.Fundamental solutions under a unit force and a unit electric charge are derived,and the corresponding frequency response functions are combined with a discrete convolution-fast Fourier transform(DC-FFT)algorithm to achieve an efficient semi-analytical contact model.The numerical results demonstrate that an increase in the surface charge density reduces the indentation pressure and modifies the electric potential distribution.A higher steady carrier concentration enhances the screening effect,suppresses the electromechanical coupling,and shifts the system response toward purely elastic behaviors.The sensitivity analysis shows that the indentation depth is dominated by the elastic constants,while the electric potential is mainly affected by the piezoelectric coefficient.Although the analysis is carried out with spherical indenters,the model is not limited to a specific indenter shape.It provides an effective tool for investigating complex 3D PSC contact problems and offers useful insights into the design of PSC materials-based devices. 展开更多
关键词 contact mechanics semi-analytical method piezoelectric semiconductor(PSC) conductive indenter electromechanical response
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Down-Top Strategy Engineered Large-Scale Fluorographene/PBO Nanofibers Composite Papers with Excellent Wave-Transparent Performance and Thermal Conductivity 认领 引用 被引量：3
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作者 Yuhan Lin Lin Tang +4 位作者 Mingshun Jia Mukun He Junliang Zhang Yusheng Tang Junwei Gu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第1期935-951,共17页
With the miniaturization and high-frequency evolution of antennas in 5G/6G communications,aerospace,and transportation,polymer composite papers integrating superior wave-transparent performance and thermal conductivit... With the miniaturization and high-frequency evolution of antennas in 5G/6G communications,aerospace,and transportation,polymer composite papers integrating superior wave-transparent performance and thermal conductivity for radar antenna systems are urgently needed.Herein,a down-top strategy was employed to synthesize poly(p-phenylene benzobisoxazole)precursor nanofibers(prePNF).The prePNF was then uniformly mixed with fluorinated graphene(FG)to fabricate FG/PNF composite papers through consecutively suction filtration,hot-pressing,and thermal annealing.The hydroxyl and amino groups in prePNF enhanced the stability of FG/prePNF dispersion,while the increasedπ-πinteractions between PNF and FG after annealing improved their compatibility.The preparation time and cost of PNF paper was significantly reduced when applying this strategy,which enabled its large-scale production.Furthermore,the prepared FG/PNF composite papers exhibited excellent wave-transparent performance and thermal conductivity.When the mass fraction of FG was 40 wt%,the FG/PNF composite paper prepared via the down-top strategy achieved the wave-transparent coefficient(|T|2)of 96.3%under 10 GHz,in-plane thermal conductivity(λ∥)of 7.13 W m−1K−1,and through-plane thermal conductivity(λ⊥)of 0.67 W m−1K−1,outperforming FG/PNF composite paper prepared by the top-down strategy(|T|2=95.9%,λ∥=5.52 W m−1K−1,λ⊥=0.52 W m−1K−1)and pure PNF paper(|T|2=94.7%,λ∥=3.04 W m−1K−1,λ⊥=0.24 W m−1K−1).Meanwhile,FG/PNF composite paper(with 40 wt%FG)through the down-top strategy also demonstrated outstanding mechanical properties with tensile strength and toughness reaching 197.4 MPa and 11.6 MJ m−3,respectively. 展开更多
关键词 PBO nanofibers Fluorinated graphene Wave-transparency Thermal conductivity
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Textile‑Scale Liquid-Metal Fibers with Strain‑Invariant Conductivity Enable Absorption‑Enhanced EMI Shielding 认领 引用 被引量：1
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作者 Ruosong Li Ruyi Tao +6 位作者 Youpeng Huangfu Zhongyi Bai Liping Wei Yuan Yan Rui Zhang Daidi Fan Biao Zhao 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第8期663-679,共17页
Conventional conductive elastomeric composites,consisting of conductive fillers dispersed in elastomers,are widely used in soft electronics for strain sensing via resistance changes arising from filler separation duri... Conventional conductive elastomeric composites,consisting of conductive fillers dispersed in elastomers,are widely used in soft electronics for strain sensing via resistance changes arising from filler separation during elongation.However,they often exhibit substantial performance degradation under large strains.Liquid metals(LMs)have recently attracted significant attention owing to their unique fusion of metallic conductivity and fluidic properties.Here,we develop sheath-core fibers featuring a magnetic LM(MLM)core,formed by embedding Fe particles into eutectic gallium-indium alloy(EGaIn)dispersed in thermoplastic polyurethane(TPU),and coaxially wet-spun with an insulating TPU sheath.Subsequently,these MLM/TPU fibers are woven into horizontally and vertically interlaced textiles.This wet-spinning process,coupled with post-freeze-pressure activation,fuses Fe-EGaIn droplets into percolating networks,yielding exceptional conductivity(3.9×104 S m−1),extreme stretchability(482%elongation),and strain-invariant resistance(−6%at 100%strain).Particularly at 7 wt%Fe,the MLM/TPU composite serves as a magnetically responsive,reconfigurable conductor that enables tunable Joule heating(reaching 75.8℃ at 1.2 V),infrared stealth,and magnetically driven remote switching,while promoting absorption-dominated electromagnetic interference(EMI)shielding(33.82 dB with an absorptivity of 0.520).This study offers substantial promise for applications in wearable electronics,soft robotics,and EMI-shielding textiles. 展开更多
关键词 Magnetic liquid metal Flexible conductive fiber Electromagnetic interference shielding Joule heating
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Sub-nanometer resolution for anion conduction in a covalent-organic framework membrane:A hierarchical approach 认领 引用 被引量：1
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作者 Qiang Wang Zhiguo Qu Jianwen Jiang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第2期186-197,I0006,共12页
Ion conduction in covalent-organic framework(COF)membranes is vital for energy conversion and storage.Conventional phenomenological methods based on the Arrhenius equation offer micrometer-scale cognition of ion condu... Ion conduction in covalent-organic framework(COF)membranes is vital for energy conversion and storage.Conventional phenomenological methods based on the Arrhenius equation offer micrometer-scale cognition of ion conduction,whereas they ignore atomic details of ion-pore interactions and sophisticated conduction mechanisms,leaving gaps in high-resolution and bottom-up understanding of ion conduction in a nanoconfined space.In this study,we develop a hierarchical approach by holistically synergizing electronic structure calculations,first-principles molecular dynamics simulations,and thermodynamic integration methods to investigate the conduction of chloride(Cl-)and hydroxide(OH-)ions in a COF membrane.It is revealed that Cl-ion with symmetric charge distribution undergoes weak solvation and tight ion-pore binding,which results in a tortuous conduction pathway,a high energy barrier,and slow diffusion based on the vehicular mechanism.In remarkable contrast,OH-ion with heterogeneous charge distribution features strong solvation and weak ion-pore binding,and it jumps frequently via a smooth pathway and a low energy barrier.Moreover,OH-ion conduction follows a mixed vehicular and Grotthuss mechanism,causing highly mutable ion identity and number,as well as superior dynamics due to proton transfer.This hierarchical approach provides sub-nanometer resolution insights into ion conduction,guiding intelligent membrane design and performance regulation to control ion conduction for emerging applications. 展开更多
关键词 Anion conduction Grotthuss mechanism Vehicular mechanism Free energy barrier Covalent-organic frameworks
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Critical role of outside xylem hydraulic conductance in regulating stomatal conductance and water use efficiency in cotton across different planting densities 认领 引用
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作者 Yunrui Chen Dayong Fan +5 位作者 Ziliang Li Yujie Zhang Yang He Minzhi Chen Wangfeng Zhang Yali Zhang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第3期965-976,共12页
Hydraulic theory predicts a positive coupling between leaf hydraulic conductance(Kleaf)and stomatal conductance(gs);however,this theory has not been fully supported by observations,and underlying mechanisms are ... Hydraulic theory predicts a positive coupling between leaf hydraulic conductance(Kleaf)and stomatal conductance(gs);however,this theory has not been fully supported by observations,and underlying mechanisms are poorly understood.Partitioning Kleafinto inside-xylem(Kx)and outside-xylem(Kox)components offers a refined framework for elucidating the regulation of gs by leaf hydraulics.While optimal planting density may enhance water use efficiency(WUE)through modulation of gs,corresponding changes in leaf hydraulic properties and their influence on gas exchange remain unclear.We examined relationships among Kx,Kox,gs,leaf photosynthetic rate(AN),and WUE,and analyzed the structural determinants of Koxin cotton grown under eight planting densities:12,18,24,36,48,60,72,and 84 plants m–2.Results showed that as planting density increased,Kleafand AN remained stable,whereas Koxand gs declined significantly.Leaf thickness and the volume fraction of inter-cellular air space were key structural factors influencing Kox.Neither Kleafnor Kxcorrelated with AN or gs;however,Koxexhibited a significant positive correlation with gs.Furthermore,Koxwas negatively correlated with WUE.These findings indicate that Koxmodulates gs to minimize water loss without compromising AN,thereby enhancing WUE in cotton across varying planting densities. 展开更多
关键词 cotton leaf hydraulic conductance water use efficiency planting density mesophyll structure stomatal conductance
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Efficient Conductivity Enhancement of Flexible Polyaniline Films Induced by Ultrafast Photoexcitation 认领 引用
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作者 Jiawei Li Zhengjie Song +8 位作者 Xiangyu Chen Yunfan Yue Sheng Li Zhongle Zeng Jiakang Zhou Huan Wang Niannian Yu Xuewen Wang Qingjie Zhang 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2026年第2期489-495,共7页
Polyaniline(PANI)exhibits remarkable electrical conductivity and mechanical flexibility,rendering it widely applicable in flexible electronic devices.For instance,it serves as a channel layer material in Organic Elect... Polyaniline(PANI)exhibits remarkable electrical conductivity and mechanical flexibility,rendering it widely applicable in flexible electronic devices.For instance,it serves as a channel layer material in Organic Electrochemical Transistors(OECTs).In OECTs,the conductivity of the channel layer plays a pivotal role in dictating the switching speed and current-carrying capacity of the device.Proton acid doping represents an efficacious approach to enhancing the conductivity of polymers.However,the efficiency of direct doping of protic acid is low,thereby imposing limitations on the conductivity of polyaniline.In this study,ultrafast photoexcitation was implemented to efficiently improve the conductivity of camphor sulfonic acid(CSA)doped PANI films.Upon reaching a laser fluence of 166.2 mJ cm-2,the conductivity of PANI films experienced a remarkable increment of nearly four orders of magnitude,soaring to 117.6 S m-1,while its sheet resistance decreased to 170.9Ωsq-1.Meanwhile,fs-laser-treated PANI-CSA films exhibited excellent stability.The PANI-based OECT device was prepared,and the transconductance escalated from 0.113 to 0.503 mS,representing an increase exceeding fourfold.Our work provides a simple,eco-friendly,and sustainable processing technology for the preparation of high-performance PANI flexible conductive films,showing great application potential for flexible electronic devices. 展开更多
关键词 conducting polymer conductivity enhancement doping camphor sulfonic acid femtosecond laser PANI
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Doping-dependent optical properties in YBCO superconducting films via BaHfO3 nanocrystal addition 认领 引用
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作者 Shulun Han Yuanjie Ning +7 位作者 Jing Chen Yanqun Guo Zicong Yang Ping Zhu Zhigang Zeng Chuanbing Cai Xinmao Yin Lijun Tian 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第2期569-576,共8页
This study investigates the effect of BaHfO3(BHO)addition on the optical properties of YBa_2Cu3O7-δ(YBCO)superconducting thin films using spectroscopic ellipsometry.Through Raman spectroscopy and SEM analysi... This study investigates the effect of BaHfO3(BHO)addition on the optical properties of YBa_2Cu3O7-δ(YBCO)superconducting thin films using spectroscopic ellipsometry.Through Raman spectroscopy and SEM analysis,optimal 10-min Ar ion etching effectively removes surface a-axis-oriented grains and Ba–Cu–O impurities,enhancing surface quality.Optical conductivity analysis reveals a doping-dependent evolution:10%BHO doping maximizes free carrier density and interband transition efficiency,attributed to optimized Cu–O bond contraction and reduced lattice distortions.Higher doping induces defect clustering,carrier scattering,and redshifted transitions due to lattice expansion.Dielectric function and loss function analyses confirm enhanced plasmonic behavior and flux pinning at 10%doping,while excessive doping degrades electronic transitions.These results highlight the critical role of controlled BHO addition and surface treatment in tailoring the optical and superconducting properties of YBCO,offering insights into the interplay among doping,carrier dynamics,and electronic structure in high-temperature superconductors(HTS). 展开更多
关键词 high-temperature superconductivity YBCO films optical conductivity spectroscopic ellipsometry
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Rapidly fabricated carbon/carbon composites with a mesophase pitch binder and graphite flake filler with excellent EMI shielding and thermal conductivity 认领 引用
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作者 Luo Pengfei Tian Shan +1 位作者 Guo Fengjun Xiao Zhichao 《新型炭材料（中英文）》 SCIE EI CSCD 北大核心 2026年第3期597-611,I0006,I0007,共15页
Carbon/carbon(C/C)composites are ideal materials for electromagnetic interference(EMI)shielding and thermal management in the aerospace field because of their low density.However,traditional C/C composites primarily r... Carbon/carbon(C/C)composites are ideal materials for electromagnetic interference(EMI)shielding and thermal management in the aerospace field because of their low density.However,traditional C/C composites primarily rely on repeated densification to increase their EMI shielding effectiveness(SE),which not only increases density but also involves lengthy preparation cycles.We have constructed a unidirectional(1D)C/C composite using a matrix of mesophase pitch-derived carbon and graphite flakes,reinforced with mesophase pitch-based carbon fibers.Using a one-step consolidation process produced by spontaneous assembly during heating,the open pores and a continuous conductive network give the composite an EMI SE of up to 83.97 dB in the 8.2-12.4 GHz(X-band).The material also has a thermal conductivity of 191.84 W·m−1·K−1and an electrical conductivity of 6.50×104S·m−1along the fiber direction,together with a flexural strength exceeding 100 MPa,while having a bulk density of only 1.01 g·cm−3.This work therefore presents a short-cycle fabrication strategy for low-density C/C composites that integrate high EMI SE,efficient thermal management,and good mechanical properties. 展开更多
关键词 Carbon/carbon(C/C)composites Mesophase pitch Electromagnetic interference(EMI)shielding Thermal conductivity Electrical conductivity
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θ-TaN:Redefining the thermal conductivity limit of metallic materials 认领 引用
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作者 Miao-Ling Lin Ping-Heng Tan 《Journal of Semiconductors》 EI CAS CSCD 2026年第3期6-9,共4页
The relentless drive towards smaller,faster,and more pow-erful electronics has made thermal management a critical bot-tleneck for performance and reliability.For over a century,the thermal conductivity(κ)of metallic ... The relentless drive towards smaller,faster,and more pow-erful electronics has made thermal management a critical bot-tleneck for performance and reliability.For over a century,the thermal conductivity(κ)of metallic materials has long been considered to have an inherent upper limit for thermal conductivity,plateauing~400 W·m-1·K-1.This ceiling is rooted in fundamental physics:in typical metals,heat is primarily carried by electrons,and their transport is severely hampered by strong electron-phonon coupling and inherent lat-tice anharmonicity[1]. 展开更多
关键词 metallic materials thermal conductivity electron phonon coupling thermal conductivityplateauing electronic transport thermal management lattice anharmonicity
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Experimental study of early strength and hydraulic conductivity of cemented soils improved with soda residue and bentonite:Promoting solid waste recycling 认领 引用
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作者 Pengju GAO Xia WEI +2 位作者 Jianwen DING Sai ZHANG Chenhao LI 《ENGINEERING Structure and Civil Engineering》 SCIE EI CAS CSCD 2026年第6期1271-1282,共12页
The insufficient early strength and hydraulic conductivity of cemented soil can significantly impact the quality of deep cement mixing(DCM)walls,particularly in water-rich sandy silt regions.To enhance the early engin... The insufficient early strength and hydraulic conductivity of cemented soil can significantly impact the quality of deep cement mixing(DCM)walls,particularly in water-rich sandy silt regions.To enhance the early engineering performance of DCM walls,industrial by-products(IBPs)such as soda residue(SR),and other additives such as bentonite and water glass(WG)were used.Unconfined compression strength(UCS)and hydraulic conductivity tests were conducted to assess the strength and hydraulic conductivity of the improved cemented soil.Microstructural and mineralogical tests were performed to reveal the mechanisms of SR,bentonite,and WG.The results indicate that adding SR introduces sulfate and chloride ions into the reaction system,thereby promoting the formation of hydration products.However,when the SR content exceeds 8%,it leads to the precipitation of calcium carbonate,resulting in the formation of calcium hydroxide(CH)crystals,which reduces the 7 d UCS by 15.4%compared to 8%SR.The addition of bentonite increases the silica and aluminum content,promoting the formation of calcium silicate hydrate(C-S-H)and calcium aluminosilicate hydrate(C-A-S-H),while also filling the soil pores,reducing the early hydraulic conductivity of the cemented soil by 1.5 orders of magnitude(from 9.87×10−6to 5.28×10−7cm/s at 7 d with 7%bentonite).The addition of WG significantly enhances the early strength of the cemented soil,with an average increase of 12.5%(from 52.5%–60.0%to 62.5%–75.0%)in the 7 d strength performance ratio(n=qu7d/qu28d).This study contributes to improving the early engineering performance of DCM walls from economic and environmental perspectives,promoting the sustainable utilization of IBPs. 展开更多
关键词 cemented soil SR bentonite WG strength and hydraulic conductivity
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Enhancing the Ionic Conduction of Ceria-Based Electrolytes for LT-SOFCs via Entropy Engineering 认领 引用
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作者 Xiu-Xiu Li En-Yi Hu +4 位作者 Fa-Ze Wang Jun Wang Chen Xia Aleksandar Staykov Peter Lund 《Rare Metals》 SCIE EI CAS CSCD 2026年第1期616-628,共13页
Developing alternative electrolytes with enhanced ionic conductivity is crucial to reducing the operating temperature of solid oxide fuel cells(SOFCs)for broader applications.Entropy engineering offers many opportunit... Developing alternative electrolytes with enhanced ionic conductivity is crucial to reducing the operating temperature of solid oxide fuel cells(SOFCs)for broader applications.Entropy engineering offers many opportunities for material design,presenting a promising avenue to develop new electrolytes.In this work,two new ceria-based electrolytes,the medium-entropy Sm0.25La0.25Pr0.25Ce0.25O2-δ(SLPC25)and low-entropy Sm0.05La0.05Pr0.05Ce0.85O2-δ(SLPC5)are designed for low-temperature SOFCs using the entropy engineering strategy,with pure CeO2as a reference.It is found that higher configurational entropy leads to enriched oxygen vacancies in the two oxides and thus enhances the ionic transport,which is verified through material characterizations,density functional theory calculations,and cell performance tests.The medium-entropy SLPC25exhibits superior cell performance(836 mW cm-2)and improved ionic conductivity(0.09 S cm-1)at 520℃as compared to those of the low-entropy SLPC5 and CeO2.Further investigation confirms the hybrid proton-oxygen ion conduction and good fuel cell stability of the SLPC25 electrolyte.This study indicates that higher entropy enhances the ionic conductivity and cell performance of ceria-based electrolytes.The entropy engineering strategy used here holds significant potential to develop advanced electrolytes for low-temperature SOFCs. 展开更多
关键词 ceria electrolyte electrochemical performance entropy engineering ionic conductivity SOFCs
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N-3 of 1-methylimidazole:Enhancing proton conduction in COF under humidity conditions 认领 引用
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作者 Kun Zhang Lei Wu +7 位作者 Kaixi Lan Yanting Zhang Wenxin Zhang Huanhuan Li Guoji Huang Dongshuang Wu Long Chen Manni Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第6期691-694,共4页
The proton conduction mechanism of imidazole and its homologues within confined spaces has attracted much attention from researchers,which is highly beneficial for the development of novel proton exchange membranes.Tr... The proton conduction mechanism of imidazole and its homologues within confined spaces has attracted much attention from researchers,which is highly beneficial for the development of novel proton exchange membranes.Traditionally,the hydrogen at the 1-position(H-1)on the nitrogen(N-1)of imidazole is seen as the exclusive source of mobile protons.However,we suggest that the 3-position nitrogen atom(N-3)can also generate mobile protons under hydrous conditions.This is because N-3 can form hydrogen bonds with water,which are particularly robust in confined spaces,thereby enhancing proton ionization from water and facilitating proton transfer.Based on this concept,1-methylimidazole was introduced into a covalent organic framework(COF),resulting in a remarkable proton conductivity of 2.40×10–3S/cm at 70℃ and 100%relative humidity.This performance is on par with that of COFs doped with imidazole,demonstrating the key role of N-3…H2O interactions within the framework in producing mobile protons and facilitating proton diffusion.Furthermore,this challenges the conventional viewpoint that H-1 of imidazole is the sole contributor to proton concentration,offering a new strategy for the preparation of high-performance proton conductors. 展开更多
关键词 Covalent-organic frameworks(COFs) 1-Methylimidazole Imidazole Proton conduction H-bond interaction
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On AlNP/Mg-Zn-Cu cast composites with low expansion and high thermal conductivity 认领 引用
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作者 Shu-sen Wu Lu Chen +2 位作者 Shu-lin Lü Wei Guo Jian-yu Li 《China Foundry》 SCIE EI CAS CSCD 2026年第1期101-107,共7页
There is an urgent need to develop magnesium-matrix materials that exhibit both high thermal conductivity and low thermal expansion to ensure compatibility with chips.This study aims to develop a Mg-Zn-Cu alloy with h... There is an urgent need to develop magnesium-matrix materials that exhibit both high thermal conductivity and low thermal expansion to ensure compatibility with chips.This study aims to develop a Mg-Zn-Cu alloy with high thermal conductivity.Furthermore,it explores the preparation of AlNP/Mg-Zn-Cu composites featuring low coefficients of thermal expansion.The stir casting method was utilized to fabricate the composites and an investigation was conducted to examine their microstructure and thermal properties.Results indicate that the addition of AlNPreduces the thermal expansion coefficient while maintaining relatively high thermal conductivity.Specifically,the AlNP/Mg-0.5Zn-0.5Cu composite with 30wt.%AlNPachieves a thermal conductivity of 132.7 W·m-1·K-1and a thermal expansion coefficient of 18.5×10-6K-1,rendering it suitable for electronic packaging applications where thermal management is critical. 展开更多
关键词 thermal expansion thermal conductivity magnesium-matrix composites Mg-Zn-Cu alloy
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