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Surface graphitization analysis of cerium-polished HFCVD diamond films with micro-raman spectra 认领 引用 被引量：1
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作者 王树彬 孙玉静 田莳 《Journal of Rare Earths》 SCIE EI CAS 2008年第3期362-366,共5页
The etching technique using Ce is a convenient and fast method for polishing and shaping diamond films. In this study, the influence of polishing parameters such as polishing temperature and time on the surface crysta... The etching technique using Ce is a convenient and fast method for polishing and shaping diamond films. In this study, the influence of polishing parameters such as polishing temperature and time on the surface crystallinity and phase composition of diamond films was thoroughly investigated via the analysis of Raman spectra such as FWHM and ID/IG. Moreover, the issue on the graphitization of diamond after polishing with Ce was further researched through the detailed study of the depth distribution of Raman data including FWHM and ID/IG, and a result completely different from the hot-iron metal polished ones was obtained. The results showed that polished diamond films had considerably higher diamond content than those before polishing, and not a bit of graphitization was found in the polished ones, owing to a higher solubility of carbon in rare earth metal Ce than that in transition metals, and the original crystallinity of the films polished with Ce did not deteriorate. 展开更多
关键词 diamond films polishing cerium surface graphitization rare earths
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Effect of surface oxidation on the interfacial and mechanical properties in graphite/epoxy composites composite bipolar plates 认领 引用
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作者 Dongmei Yao Junsheng Zheng +5 位作者 Liming Jin Xiaomin Meng Zize Zhan Runlin Fan Cong Feng Pingwen Ming 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第11期539-542,共4页
Epoxy resin-reinforced graphite composites have found extensive application as bipolar plates in fuel cells for stationary power supplies,valued for their lightweight nature and exceptional durability.To enhance the i... Epoxy resin-reinforced graphite composites have found extensive application as bipolar plates in fuel cells for stationary power supplies,valued for their lightweight nature and exceptional durability.To enhance the interfacial properties between graphite and epoxy resin(EP),surface oxidation of graphite was carried out using diverse functional groups.Experimental assessments illustrated that the composites with graphite oxide resulted in heightened mechanical strength and toughness compared to pristine graphite,which could be attributed to the excellent interface connection.Moreover,these composites displayed remarkable conductivity while simultaneously retaining their mechanical attributes.Furthermore,molecular dynamics simulations outcomes unveiled that the inclusion of oxygen-containing functional groups on the graphite surface augmented the interfacial energy with EP,and the interface morphology between graphite and resin exhibited heightened stability throughout the stretching process.This simple and effective technique presents opportunities for improving composites interfaces,enabling high load transfer efficiency,and opens up a potential path for developing strong and tough composite bipolar plates for fuel cells. 展开更多
关键词 G/EP interface strength and toughness Epoxy resin-reinforced graphite composites Composite bipolar plates Molecular dynamics simulations Surface oxidation of graphite
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Effect of the graphitic degree of carbon supports on the catalytic performance of ammonia synthesis over Ba-Ru-K/HSGC catalyst 认领 引用 被引量：8
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作者 Wei Jiang Ying Li +3 位作者 Wenfeng Han Yaping Zhou Haodong Tang Huazhang Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2014年第4期443-452,共10页
A series of high surface area graphitic carbon materials （HSGCs） were prepared by ball-milling method. Effect of the graphitic degree of HSGCs on the catalytic performance of Ba-Ru-K/HSGC-x （x is the ball-milling t... A series of high surface area graphitic carbon materials （HSGCs） were prepared by ball-milling method. Effect of the graphitic degree of HSGCs on the catalytic performance of Ba-Ru-K/HSGC-x （x is the ball-milling time in hour） catalysts was studied using ammonia synthesis as a probe reaction. The graphitic degree and pore structure of HSGC-x supports could be successfully tuned via the variation of ball-milling time. Ru nanoparticles of different Ba-Ru-K/HSGC-x catalysts are homogeneously distributed on the supports with the particle sizes ranging from 1.6 to 2.0 nm. The graphitic degree of the support is closely related to its facile electron transfer capability and so plays an important role in improving the intrinsic catalytic performance of Ba-Ru-K/HSGC-x catalyst. 展开更多
关键词 high surface area graphitic carbon materials （HSGCs） supported Ru catalysts ammonia synthesis graphitic degree ball-roJlling
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Exploring copperβ-diketiminate complexes for heterogeneous ammonia oxidation anchored on graphitic surfaces via CH–πandπ–πinteractions 认领 引用
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作者 Josep A.Gutiérrez-Orgaz Marco Nicaso +6 位作者 Anna M.Beiler Marta Martínez-Belmonte Jordi Benet-Buchholz Mireia Segado-Centellas Xavier Sala Carles Bo Antoni Llobet 《Inorganic Chemistry Frontiers》 SCIE EI CAS CSCD 2025年第22期7234-7249,共16页
Ammonia is a compelling candidate for a carbon-free energy carrier,offering potential applications as both a hydrogen vector and a fuel.Unlocking these applications requires the development of efficient ammonia oxidat... Ammonia is a compelling candidate for a carbon-free energy carrier,offering potential applications as both a hydrogen vector and a fuel.Unlocking these applications requires the development of efficient ammonia oxidation catalysts.Building on recent work with a fluorinated Cu(I)β-diketiminate catalyst for homogeneous ammonia oxidation,we present the first examples of hybrid electrodes employing firstrow metal complexes and supramolecular anchoring for heterogeneous ammonia oxidation.In this study,we developed innovative synthetic methodologies to produce a family ofβ-diketiminate ligands and complexes. 展开更多
关键词 graphitic surfaces interactions supramolecular anchoring firstrow metal complexes diketiminate complexes hybrid electrodes copper heterogeneous ammonia oxidation
Surface Graphite Degeneration in Ductile Iron Castings for Resin Molds 认领 引用 被引量：4
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作者 Iulian Riposan Mihai Chisamera +1 位作者 Stelian Stan Torbjorn Skaland 《Tsinghua Science and Technology》 EI CAS 2008年第2期157-163,共7页
The objective of this paper is to review the factors influencing the formation of degenerated graphite layers on the surfaces of ductile iron castings for chemical resins-acid molding and core-making systems and how t... The objective of this paper is to review the factors influencing the formation of degenerated graphite layers on the surfaces of ductile iron castings for chemical resins-acid molding and core-making systems and how to reduce this defect. In the resin mold technique the sulphur in the P-toluol sulphonic acid （PTSA）, usually used as the hardener, has been identified as one factor causing graphite degeneration at the metalmold interface. Less than 0.15% S in the mold （or even less than 0.07% S） can reduce the surface layer depth. Oxygen may also have an effect, especially for sulphur containing systems with turbulent flows in the mold, water-bearing no-bake binder systems, Mg-Silica reactions, or dross formation conditions. Despite the lower level of nitrogen in the iron melt after magnesium treatment （less than 90 ppm）, nitrogen bearing resins have a profound effect on the frequency and severity of surface pinholes, but a limited influence on surface graphite degeneration. 展开更多
关键词 ductile iron castings surface graphite degeneration resin mold sulphur oxygen nitrogen
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Self-templated covalent functionalization of graphitic surfaces with a quasi-periodic pattern 认领 引用
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作者 Yuanzhi Xia Johannes Seibel Steven De Feyter 《Aggregate》 CAS 2022年第4期121-130,共10页
Patterned covalent functionalization of graphitic surfaces(GSs)is of interest in the development of devices and nanocomposite materials.In contrast to the strategies using external templates or control for realizing p... Patterned covalent functionalization of graphitic surfaces(GSs)is of interest in the development of devices and nanocomposite materials.In contrast to the strategies using external templates or control for realizing patterned covalent functionalization of GSs,here,we present a self-templated strategy by exploiting the synergistic effects of chemical and physical functionalization of GSs.Therefore,a diazonium salt is reduced by potassium iodide(KI)in dimethyl sulfoxide while the solution is in contact with a GS,resulting in its spatially heterogeneous,that is,chemical and physical,functionalization.This heterogeneous functionalization leads to a quasiperiodic pattern of striped corrals with three equivalent orientations in the covalent layer.The formation of the striped corrals is ascribed to physisorbed domains formed by self-assembled N2,which is produced in situ during the reduction of the diazonium salt,preventing the covalent functionalization. 展开更多
关键词 diazonium chemistry graphitic surfaces patterned covalent functionalization quasi-periodic patterning self-templated strategy
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