氧化石墨烯/超细银粒子复合物的制备及其光电性能

Preparation and Photoelectric Performance of Graphene Oxide/Ultrafine Silver Composite

超细银粉在太阳能电池正面电极领域有广阔的应用前景,其粒径分布、分散性、表面态与其性能息息相关。本文通过在液相还原法合成超细银粉的后期引入氧化石墨烯(GO),利用溶液状态下二者相对活性的表面的相互作用获得了性能优良的银粉。通过X射线衍射(XRD)、拉曼光谱(Raman)和扫描电子显微镜(SEM)等手段对所得复合超细银粉进行结构及形貌表征,结果显示该法获得的银粉分散性较好、尺寸分布较窄。进而,利用紫外-可见光谱探讨了GO与银粒子之间的相互作用。而且研究发现:固定硝酸银溶液的浓度,随着GO含量的增加,银粉的导电性能先升高后降低,当GO的质量分数为2.5%时,导电性能更好。这为超细银粉在实际中的应用提供重要数据和有益参考。

Ultrafine silver powder has shown wide applications in the fields of communication,electronics and front electrode of solar cells.Its size distribution,dispersion and surface state have close relationship with its performance.In this paper,in order to obtain ultrafine silver composite with narrow size distribution,good dispersibility and high conductivity,graphene oxide(GO)was introduced in the later period of silver particles synthesized by liquid phase reduction.The structure and morphology of the composite silver powder were characterized by X-ray diffraction,Raman spectroscopy,and scanning electron microscopy.The results show that the ultrafine silver powders obtained by this method possess good dispersion and narrow size distribution.Furthermore,the interaction between GO and silver particles was explored by UV-visible spectroscopy.It is also found that by fixing the concentration of silver nitrate solution,and increasing the content of GO,the conductivity of silver powder first increases,and then decreases.When the mass percentage of GO is 2.5%,due to more effective contact among silver particles,its interfacial resistance is lower and photocurrent is higher.It will provide important data and valuable reference for the application of ultrafine silver.