Oxygen plasma treatment for improving graphene distribution and mechanical properties of graphene/copper composites
Oxygen plasma treatment for improving graphene distribution and mechanical properties of graphene/copper composites
复制标题
氧等离子体处理改善石墨烯/铜复合材料的石墨烯分布和机械性能
DOI：
10.1016/j.msea.2018.08.064
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发表时间：
2018-09-26
期刊：
影响因子：
6.4
通讯作者：
Li, Yuan-bo
中科院分区：
文献类型：
--
作者：
Chu, Ke;Liu, Ya-ping;Li, Yuan-bo
目前的石墨烯/金属复合材料大多局限于使用氧化石墨烯(GO)的情况，GO含有很高的缺陷。本工作以高质量的石墨烯纳米片(GNPs)为原料，制备了GNP/铜复合材料。采用氧等离子体处理方法对GNPs进行表面功能化处理，接枝了大量的含氧官能团，但对石墨烯结构没有明显的破坏。结果表明，经等离子体处理的纳米颗粒(P-GNPs)不仅在乙醇/水中具有良好的分散性，而且与铜粉的静电亲和力增强，得到了GNP分布均匀、界面结合良好的纳米颗粒/铜复合材料。在GNP含量为1%时，P-GNP/Cu复合材料的屈服强度显著提高，达到188 Mpa，断裂伸长率达到21%，显著高于未处理GNP的复合材料(158 Mpa，12%)。强度的提高可以用荷载传递机制来解释，并与修正的剪力滞模型的预测基本一致。P-GNP/Cu复合材料具有良好的塑性是由于其具有良好的位错存储能力。因此，氧等离子体处理为改善石墨烯分布和改善石墨烯/金属复合材料的力学性能提供了一种普遍而有效的策略。
Current graphene/metal composites are mostly limited to the cases of using graphene oxide (GO) which contains a high level of defects. In this work, the high-quality graphene nanoplatelets (GNPs) were used as starting graphene material to prepare the GNP/Cu composite. Oxygen plasma treatment was employed to conduct the surface functionalization of GNPs by grafting the considerable oxygen-functional groups but without noticeably damaging the graphene structure. It was found that the plasma-treated GNPs (P-GNPs) exhibited not only a good dispersability in ethanol/water, but also an enhanced electrostatic affinity with Cu powder, resulting in the PGNP/Cu composite with a uniform GNP distribution and a good interfacial bonding. At 1 vol% GNP loading, the P-GNP/Cu composite presented a largely enhanced yield strength of 188 MPa with a relatively high failure elongation of 21%, significantly outperforming the composite with untreated GNPs (158 MPa, 12%). The enhanced strength could be explained by the load transfer mechanism and agreed approximately with the prediction of a modified shear-lag model. The good ductility was attributed to the prominent dislocation storage capability of P-GNP/Cu composite. Therefore, the oxygen plasma treatment provides a general and effective strategy to improve graphene distribution and mechanical properties of graphene/metal composites.