热膨胀石墨烯表面化学镀纳米镍

Preparation of a Ni/graphene nanocomposite by an electroless plating method

以热膨胀还原所制石墨烯为载体,采用超声辅助-化学镀法制得石墨烯担载Ni纳米复合材料。利用X射线衍射仪和透射电子显微镜和能谱仪分析其微观结构及元素组成,研究其化学镀镍的反应机理。结果表明,随施镀时间的延长,Ni纳米颗粒以Pd为自催化活性中心,逐步附着在石墨烯表面上,并随Pd纳米颗粒的分布情况而富集在石墨烯边缘及皱褶区域;Sn纳米颗粒对化学镀镍贡献较小,以致化学镀镍后仍有部分残留。可见,在石墨烯表面进行化学镀镍时,Pd对Ni纳米颗粒的生长成核起定位和催化作用。

Thermally reduced graphene oxide was pretreated consecutively in solutions of SnC12 in HC1 and PdC12 in HC1. The re- suiting material was then plated with nickel nanoparticles under sonication to prepare Ni/graphene nanocomposites. XRD, TEM and EDS were used to investigate the microstructure, elemental composition and the chemical plating mechanism. Results show that Sn nanoparticles are distributed evenly on the reduced graphene oxide. Pd nanoparticles are located preferentially at the edges of gra- phene sheets and at wrinkles in them, and are also found on some Sn nanoparticles. Ni nanoparticles are formed on the Pd nanoparti- cles and act as active centers for Ni growththat results in covering most of the graphene sheet after plating. Keywords： Graphene; Mechanism; Electroless plating; Ni nanoparticle