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Fabrication of graphene/Cu Composite by Chemical Vapor Deposition and Effects of graphene layers on Resultant Electrical Conductivity

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Journal of Harbin Institute of Technology(New Series) 2024年第1期31卷 16-25页

作者： Xinyue Liu Yaling Huang Yuyao Li Jie Liu Quanfang Chen Department of Electrical Engineering Southwest Jiaotong UniversityChengdu 610031China

graphene(Gr)has unique properties including high electrical conductivity;Thus,graphene/copper(Gr/Cu)composites have attracted increasing attention to replace traditional Cu for electrical applications. However,the problem of how to control graphene to form desired Gr/Cu composite is not well solved. This paper aims at exploring the best parameters for preparing graphene with different layers on Cu foil by chemical vapor deposition(CVD)method and studying the effects of different layers graphene on Gr/Cu composite’s electrical conductivity. graphene grown on single-sided and double-sided copper was prepared for Gr/Cu and Gr/Cu/Gr composites. The resultant electrical conductivity of Gr/Cu composites increased with decreasing graphene layers and increasing graphene volume fraction. The Gr/Cu/Gr composite with monolayer graphene owns volume fraction of less than 0.002%,producing the best electrical conductivity up to59.8 ×10^(6)S/m,equivalent to 104.5% IACS and 105.3% pure Cu foil.

关键词： chemical vapor deposition(CVD) Gr/Cu Gr/Cu/Gr graphene layers graphene volume fraction electrical conductivity

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Platinum nanoparticles coated by graphene layers: A low-metal loading catalyst for methanol oxidation in alkaline media

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Journal of Energy Chemistry 2020年第1期29卷 81-88,I0004页

作者： Camelia Berghian-Grosan Teodora Radu Alexandru R.Biris Monica Dan Cezara Voice Fumiya Watanabe Alexandru S.Biris Adriana Vulcu National Institute for Research and Development of Isotopic and Molecular Technologies 67-103 Donat StreetCluj-Napoca 400293Romania Center for Integrative Nanotechnology Sciences University of Arkansas at Little Rock2801 S.University Ave.Little RockAR 72204USA

Platinum catalysts play a major role in the large scale commercialization of direct methanol fuel cells(DMFC).Here,we present a procedure to create a nanostructural graphene-platinum(Gr Pt)composite containing a small amount(5.3 wt%)of platinum nanoparticles coated with at least four layers of *** composite,as Gr Pt ink,was deposited on a glassy carbon electrode and its electrocatalytic activity in a methanol oxidation reaction(MOR)was evaluated in a 1 M CH3OH/1 M NaOH *** results indicated an enhanced catalytic performance of GrPt towards MOR in alkaline media compared with the Pt/C *** energy-loss spectroscopy and X-ray photoelectron spectroscopy(recorded before and after the electrochemical assays)were employed to analyze the changes in the chemical composition of the nanomaterial and to explain the transformations that took place at the electrode *** findings suggest that growing of graphene on platinum nanoparticles improve the catalytic performance of platinum-graphene composites towards MOR in alkaline media.

关键词： Low-platinum loading electrocatalyst graphene layers Methanol oxidation Electrocatalysis Alkaline fuel cell

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A comprehensive analysis of various structural parameters of Indian coals with the aid of advanced analytical tools

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International Journal of Coal Science & Technology 2016年第2期3卷 123-132页

作者： B. Manoj Department of Physics Christ University BangaloreKarnataka 560027 India

An exhaustive structural analysis was carried out on three Indian coals （ranging from sub-bituminous to high volatile bituminous coal） using a range of advanced characterization tools. Detailed investigations were carded out using UV-Visible spectroscopy, X-ray diffraction, scanning electron microscopy coupled energy dispersive spectroscopy, Raman spectroscopy and Fourier transform infrared spectroscopy. The X-ray and Raman peaks were deconvoluted and analyzed in details. Coal crystallites possess turbostratic structure, whose crystallite diameter and height increase with rank. The tJdC ratio plotted against aromaticity exhibited a decreasing trend, confirming the graphitization of coal upon leaching. It is also found that, with the increase of coal rank, the dependency of I20/I26 on La is saturated, due to the increase in average size of sp2 nanoclusters. In Raman spectra, the observed G peak （1585 cm^-1） and the D2 band arises from graphitic lattices. In IR spectrum, two distinct peaks at 2850 and 2920 cm i are attributed to the symmetric and asymmetric -CH2 stretching vibrations. The intense peak at - 1620 cm^-1, is either attributed to the aromatic ring stretching of C=C nucleus.

关键词： Coal structure Spectroscopic tools X-ray diffraction graphene layers

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