用化学气相沉积法在泡沫镍模板上生长石墨烯,获得三维石墨烯泡沫(graphenefoam, GF),并用PDMS 填充石墨烯泡沫,制备出GF/PDMS 柔性复合材料,进而研究了应力对三维石墨烯复合材料导电性能的影响. 结果表明:在弯曲情形下,GF/PDMS 复合材料的电阻相对变化率随弯曲曲率的增加而增加,且曲率较小时电阻的相对变化率增加较快,曲率较大时电阻的相对变化率增加缓慢;在拉伸情形下,GF/PDMS 复合材料的电阻相对变化率随拉伸应变的增大而增大,其平均应变灵敏度约为6, 说明GF/PDMS 复合材料在柔性导体和应力传感材料的应用上具有巨大的潜力.
A three-dimensional graphene foam and poly dimethyl siloxane (GF/PDMS) composite was fabricated by infiltrating PDMS into 3D GF. It was synthesized by chemical vapor deposition (CVD) with nickel foam as a template. Research of the strain effect on electrical conductivity of three-dimensional grapheme composites indicates that the relative change rate of resistance of the composites increases with the increaseof bending curvature under bending stress. The relative change rate increases quickly with a small bending curvature while slowly with a big curvature. Under tensile strain, the relative change rate of resistance of the composites increases with the increaseof tensile stress. Average strain sensitivity is about 6. The above results show that the GF/PDMS composite is potentially applicable to flexible conductors and stress sensing materials.
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