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Cyanide-free preparation of gold nanowires: controlled crystallinity, crystallographic orientation and enhanced field emission
- Lyu, Shuangbao, Lei, Dang Yuan, Liu, Wenqiang, Yao, Huijun, Mo, Dan, Chen, Yonghui, Hu, Peipei, Sun, Youmei, Liu, Jie, Duan, Jing Lai
- RSC advances 2015 v.5 no.41 pp. 32103-32109
- crystal structure, electric potential difference, electrochemistry, gold, nanogold, nanopores, nanowires, temperature
- The environmentally friendly preparation of nanomaterials with controlled structural features represents a development trend of nanoscience and nanotechnology. In this work, using a cyanide-free bath, gold nanowires with controlled crystallinity and preferred crystallographic orientation have been prepared by electrochemical deposition in home-made polycarbonate ion track-etched templates. Single-crystal and polycrystal gold nanowires with preferred orientations along the  and  directions have been obtained by selecting fabrication parameters. The influence mechanisms of nanopore diameter, applied voltage, and deposition temperature on structural properties are proposed. In addition, single-crystal nanowires with  preferred orientation show enhanced field emission, which may be attributed to their single-crystal structure and the lower work function of loosely packed crystal planes.