Liu Jianbo, Feng Lili, Hu Zhijian, Hu Xiaona, Hou Shuai, Wen Tao, Liu Wenqi, Zhang Ke, Zhu Xing, Ji Yinglu, Wang Qi, Guo Yuting, Wu Xiaochun
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, China.
J Nanosci Nanotechnol. 2013 Feb;13(2):1006-10. doi: 10.1166/jnn.2013.6089.
A feasible way is developed to prepare Au core/Au-Ag alloy shell nanorods (Au@Au(x)Ag(1-x) NRs) based on co-reduction of gold and silver ions under the guidance of Au NRs templates. Alloy nanorods with a wide composition range (x tunable from 0 to 1) are obtained. The Ag+/Au3+ ratios are found to affect the detailed morphology of the endcaps, which is responsible for the abnormal red-shift of localized surface plasmon resonance (SPR) mode. In consensus with theoretical prediction, dielectric sensitivity of the alloy NRs is mainly determined by the maximum of the LSPR band. Due to the change in electron structure, the alloy shells exhibit lower SERS activities than pure Ag shell.
基于在金纳米棒（Au NRs）模板的引导下金离子和银离子的共还原，开发了一种制备金核/金 - 银合金壳纳米棒（Au@Au(x)Ag(1 - x) NRs）的可行方法。获得了具有广泛组成范围（x可从0调至1）的合金纳米棒。发现Ag⁺/Au³⁺比例会影响端帽的详细形态，而端帽形态决定了局域表面等离子体共振（SPR）模式的异常红移。与理论预测一致，合金纳米棒的介电敏感性主要由LSPR带的最大值决定。由于电子结构的变化，合金壳表现出比纯银壳更低的表面增强拉曼散射（SERS）活性。
