Zhang Qi, Qin Zhenbo, Luo Qin, Wu Zhong, Liu Lei, Shen Bin, Hu Wenbin
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China.
Collaborative Innovation Center for Advanced Ship and deep-Sea Exploration, Shanghai, 200240, China.
Sci Rep. 2017 May 2;7(1):1338. doi: 10.1038/s41598-017-01439-3.
A reduced graphene oxide/copper (RGO/Cu) composite was fabricated by a surfactant free, electroless co-deposition technique. The graphene oxide (GO) sheets were reduced and RGO homogeneous distributed into the copper matrix. On the basis of nanoindentation, the presence of RGO and the increase of its content in matrix significantly raised the hardness of RGO/Cu composites. Here, the relevant strengthening effect and mechanisms involved in RGO-reinforced Cu composites were systematically evaluated. Especially, the addition of RGO in Cu matrix led to the compressive micro-strain, and the resulted distortion of the lattice parameter was calculated based on Cohen's method. However, excessive addition of GO in the electrolyte could decrease the mechanical performance due to agglomeration of RGO. Apparently, the optimal concentration for GO dispersion in co-deposition solution was deserved to discuss. After a serious of relative experiments, we could get a conclusion that this method provided a new pathway for embedded graphene into the metal matrix to improve the mechanical properties of RGO-reinforced materials.
采用无表面活性剂的化学共沉积技术制备了还原氧化石墨烯/铜（RGO/Cu）复合材料。氧化石墨烯（GO）片层被还原，且RGO均匀分布于铜基体中。基于纳米压痕测试，RGO的存在及其在基体中含量的增加显著提高了RGO/Cu复合材料的硬度。在此，系统评估了RGO增强铜复合材料的相关强化效果及作用机制。特别是，RGO添加到铜基体中导致了压缩微应变，并基于科恩方法计算了晶格参数的畸变。然而，电解液中过量添加GO会由于RGO的团聚而降低力学性能。显然，共沉积溶液中GO分散的最佳浓度值得探讨。经过一系列相关实验，我们可以得出结论，该方法为将石墨烯嵌入金属基体以改善RGO增强材料的力学性能提供了一条新途径。
