Wen Xiaogang, Wang Shuhua, Xie Yutao, Li Xiao-Yuan, Yang Shihe
Department of Chemistry, Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
J Phys Chem B. 2005 May 26;109(20):10100-6. doi: 10.1021/jp050126o.
We report on the successful synthesis of silver sulfide (Ag(2)S) nanowires by a simple and mild gas-solid reaction approach. For the nanowire synthesis, a preoxidized silver substrate is exposed to an atmosphere of an O(2)/H(2)S mixture at room temperature or slightly above. The resulting Ag(2)S nanowires are phase pure with a monoclinic crystal structure and have diameters of a few tens of nanometers and lengths up to 100 mum. The influence of reaction conditions on the diameter, length, and morphology of the Ag(2)S nanowires has been studied by a number of structural and spectroscopic techniques. The nanowire growth mechanism on the Ag substrate has been discussed, which is likely characterized by continuous deposition at the tip. Additionally, we demonstrate thinning and cutting of individual Ag(2)S nanowires with electron beams and laser beams, which are potentially useful for nanowire manipulation and engineering.
我们报道了通过一种简单温和的气固反应方法成功合成硫化银（Ag₂S）纳米线。对于纳米线的合成，将预氧化的银基底在室温或略高于室温的条件下暴露于O₂/H₂S混合气氛中。所得的Ag₂S纳米线为单相纯物质，具有单斜晶体结构，直径为几十纳米，长度可达100μm。通过多种结构和光谱技术研究了反应条件对Ag₂S纳米线的直径、长度和形貌的影响。讨论了在银基底上纳米线的生长机制，其可能的特征是在尖端连续沉积。此外，我们展示了用电子束和激光束对单个Ag₂S纳米线进行细化和切割，这对于纳米线的操纵和工程应用可能是有用的。
