Triangular Au-Ag framework nanostructures prepared by multi-stage replacement and their spectral properties

作     者：易早 张建波 陈艳 陈善俊 罗江山 唐永建 吴卫东 易有根 YI Zao;ZHANG Jian-bo;CHEN Yan;CHEN Shan-jun;LUO Jiang-shan;TANG Yong-jian;WU Wei-dong;YI You-gen

作者机构：中南大学物理科学与技术学院长沙410083 中国工程物理研究院激光聚变研究中心绵阳621900 四川大学原子与分子物理研究所成都610065 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2011年第21卷第9期

页      面：2049-2055页

核心收录：

学科分类：07[理学] 0806[工学-冶金工程] 070205[理学-凝聚态物理] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0813[工学-建筑学] 0703[理学-化学] 0814[工学-土木工程] 0702[理学-物理学] 

基　　金：Project(10804101)supported by the National Natural Science Foundation of China Project(2007CB815102)supported by the National Basic Research Program of China Project(2007B08007)supported by the Science and Technology Development Foundation of Chinese Academy of Engineering Physics,China 

主　　题：triangular Au-Ag framework nanostructures multi-stage galvanic replacement reaction surface plasmon resonance surface-enhanced Raman scattering 

摘      要：Triangular Au-Ag framework nanostructures （TFN） were synthesized via a multi-step galvanic replacement reaction （MGRR） of single-crystalline triangular silver nanoplates in a chlorauric acid （HAuCl4） solution at room temperature. The morphological, compositional, and crystal structural changes involved with reaction steps were analyzed by using transmission electron microscopy（TEM）, energy-dispersive X-ray spectrometry （EDX）, and X-ray diffraction. TEM combined with EDX and selected area electron diffraction confirmed the replacement of Ag with Au. The in-plane dipolar surface plasmon resonance （SPR） absorption band of the Ag nanoplates locating initially at around 700 nm gradually redshifted to 1 100 nm via a multi-stage replacement manner after 7 stages. The adding amount of HAuCl4 per stage influenced the average redshift value per stage, thus enabled a fine tuning of the in-plane dipolar band. A proposed formation mechanism of the original Ag nanoplates developing pores while growing Au nanoparticles covering this underlying structure at more reaction steps was confirmed by exploiting surface-enhanced Raman scattering （SERS）.