Xiong Shenglin, Xi Baojuan, Zhang Kang, Chen Yifei, Jiang Jianwen, Hu Jiangyong, Zeng Hua Chun
Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore.
Sci Rep. 2013;3:2177. doi: 10.1038/srep02177.
Triangular Ag nanoprisms are a type of most-studied noble-metal nanostructures over the past decade owing to their special structural architecture and outstanding optical and catalytic properties for a wide range of applications. Nevertheless, in contrast to active research for the synthesis of phase-pure Ag nanoprisms, no asymmetric heterodimers containing Ag prisms have been developed so far, probably due to lack of suitable synthetic methods. Herein, we devise a simple ion-exchange method to synthesize Ag2S/Ag heterodimers at room temperature, through which Ag nanoprisms with controllable size and thickness can be fabricated. Formation chemistry and optical properties of the heterodimers have been investigated. These semiconductor/metal heterodimers have exhibited remarkable bactericidal activity to E. coli cells under visible light illumination.
在过去十年中，三角形银纳米棱柱是研究最多的一类贵金属纳米结构，这归因于其特殊的结构架构以及在广泛应用中出色的光学和催化性能。然而，与合成纯相银纳米棱柱的积极研究相比，迄今为止尚未开发出含银棱柱的不对称异二聚体，这可能是由于缺乏合适的合成方法。在此，我们设计了一种简单的离子交换方法，可在室温下合成Ag2S/Ag异二聚体，通过该方法能够制备出尺寸和厚度可控的银纳米棱柱。我们对异二聚体的形成化学和光学性质进行了研究。这些半导体/金属异二聚体在可见光照射下对大肠杆菌细胞表现出显著的杀菌活性。
