Electrical and mechanical properties of poly(dopamine)-modified copper/reduced graphene oxide composites
| Autor: | Eric Borguet, Laszlo Frazer, Yao Zhao, Haoqi Li, Dmitriy A. Dikin, Zhengfeng Jia, Fei Ren, Bosen Qian |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Oxide chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Metal chemistry.chemical_compound symbols.namesake law Powder metallurgy General Materials Science Composite material Graphene Mechanical Engineering 021001 nanoscience & nanotechnology Copper 0104 chemical sciences chemistry Mechanics of Materials visual_art visual_art.visual_art_medium symbols Particle 0210 nano-technology Raman spectroscopy Dispersion (chemistry) |
| Zdroj: | Journal of Materials Science. 52:11620-11629 |
| ISSN: | 1573-4803 0022-2461 |
| DOI: | 10.1007/s10853-017-1307-z |
| Popis: | Surface oxidation is frequently encountered in powder metallurgy of metals and alloys, and it leads to a reduction in their electrical conductivities. Therefore, it is highly desired to remove the naturally occurring oxide layer from the particles surface and to prevent its subsequent formation. A new approach was proposed in this study, where copper particles were mixed with graphene oxide (GO) sheets in an aqueous solution containing dopamine (DA) molecules. It was expected that polymerization of the DA molecules on the surface of the copper particle could promote both a reduction of surface oxide layer and the adhesion of GO sheets to the particles surface. The powder system was then washed, heat-treated in inert atmosphere and compressed at room temperature to form compacts. Electron microscopy revealed nearly ideal dispersion of GO sheets within the copper matrix. X-ray photoelectron spectroscopy showed a shift from Cu2+ to Cu+ and metallic copper in the coated and heat-treated samples, and Raman spectroscopy pointed to the increased amount of sp 2 carbon as a result of the heat treatment. All DA/GO-coated and heat-treated compacts exhibited significantly higher electrical conductivity than those that have been made from pure copper powder or were not been heat-treated. Also, indentation measurements showed an increase in microhardness in samples with the shortest, 10 min, coating time and heat-treated at the highest, 600 °C, temperature. |
| Databáze: | OpenAIRE |
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