石墨烯化学镀铜及其对石墨烯/铜基复合材料组织性能的影响

Study of electroless plating Cu by reduced graphene oxide and the effects on the microstructures and properties of RGO/Cu composites

以还原氧化石墨烯（reduced graphene oxide,RGO）和CuSO4·5H2O为主要原料,通过化学镀法得到铜包覆RGO复合粉体,再与铜粉混合得到含有不同质量分数RGO（0.2%、0.4%、0.6%、0.8%）的RGO/Cu粉末混合料,经压制及烧结得到RGO/Cu复合材料。通过X射线衍射仪（X-ray diffraction,XRD）、拉曼光谱仪（Raman spectroscopy,RS）和场发射扫描电镜（field emission scanning electron microscope,FESEM）等对RGO/Cu复合材料的微观组织和相关性能进行测试分析,并与由未镀铜处理的RGO所制备的RGO/Cu复合材料的组织性能进行对比。结果表明,经化学镀处理的RGO在RGO/Cu复合材料中分布较均匀,而未镀铜处理的RGO在基体中发生明显的团聚。RGO/Cu复合材料的导电导热性随石墨烯加入量的增加有所下降,但石墨烯的加入可有效提高RGO/Cu复合材料的力学性能,且由镀铜RGO所制备的RGO/Cu复合材料的性能要优于由未处理RGO所制备的RGO/Cu复合材料的性能。此外,RGO加入量对复合材料性能也有明显影响,当添加RGO质量分数为0.4%时,由镀铜RGO所制备的RGO/Cu复合材料的综合性能达到最好,其电导率达95.01%IACS,热导率达415.5W·（m·K）-1,而压缩屈服强度和抗拉强度分别为156.73 MPa和268.62 MPa,较相同工艺条件制备的纯铜的屈服强度（75 MPa）和抗拉强度（234.64 MPa）提升了109%和14.48%。

The copper-coated reduced graphene oxide(RGO) composite powders were obtained by electroless plating method in this paper, using RGO and Cu SO4·5 H2 O as the main raw materials. The mixed RGO/Cu powders were obtained by added RGO in different mass fractions(0.2%, 0.4%, 0.6%, 0.8%). RGO/Cu composite materials were prepared by pressing and sintering. Compared with the RGO/Cu composite materials without copper-coated on RGO, the microstructures and performances of RGO/Cu composite materials were tested and analyzed by X-ray diffraction, Raman spectroscopy, and field emission scanning electron microscope. The results show that, the copper-coated RGO powders disperse uniformly in the RGO/Cu composites, while the copper-uncoated RGO agglomerates seriously in the Cu matrix. The mechanical properties of composites improve with the addition of RGO, while the electrical and thermal conductivity of the RGO/Cu composites decrease with the increase of RGO content. Properties of the RGO/Cu composites prepared by copper-coated RGO are better than those of RGO/Cu composites prepared by the Cu-unplated RGO. The maximum comprehensive performances of RGO/Cu composites prepared by copper-coated RGO in RGO mass fraction of 0.4% are obtained, and the compressive yield strength and tensile strength reach 156.73 and 268.62 MPa, respectively, which increase by 109% and 14.48%, compared with the pure copper yield strength(75 MPa) and tensile strength(234.64 MPa) obtained in the same conditions, the electrical conductivity reaches 95.01% IACS and the thermal conductivity is 415.5 W·(m·K)-1.