文献类型：期刊文献

英文题名：Real-Time Plasmonic Monitoring of Single Gold Amalgam Nanoalloy Electrochemical Formation and Stripping

作者：Wang, Jun-Gang[1,2];Fossey, John S.[4];Li, Meng[1,2,3];Xie, Tao[1,2];Long, Yi-Tao[1,2]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Dept Chem, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, State Environm Protect Key Lab Risk Assessment &, Shanghai 200237, Peoples R China;[4]Univ Birmingham, Sch Chem, Birmingham B1S 2TT, W Midlands, England

年份：2016

卷号：8

期号：12

起止页码：8305

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20161602264844);WOS:【SCI-EXPANDED(收录号:WOS:000373519500081)】；

基金：Financial support from Chinese National Foundation of Natural Science Research (21327807), National Science Found for Creative Research Groups (21421004), and 973 Program (2013CB733700) is gratefully acknowledged. The CASE network is thanked for networking opportunities.62 J.S.F. thanks ECUST for a Guest Professorship, the Royal Society for an Industry Fellowship, and the University of Birmingham for support.

语种：英文

外文关键词：plasmon; single nanoparticle; gold amalgam nanoalloy; dark-field spectroelectrochemistry; electrochemical stripping

摘要：Direct electrodeposition of mercury onto gold nanorods on an ITO-substrate, without reducing agents, is reported. The growth of single gold amalgam nanoalloy particles and subsequent stripping was monitored in real-time monitoring by plasmonic effects and single-nanoparticle dark-field spectroelectrochemistry techniques. Time-dependent Scattering spectral information conferred insight into the growth and stripping mechanism of a single nanoalloy particle. Four critical stages were observed: First, rapid deposition of Hg atoms onto Au nanorods; second, slow diffusion of Hg atoms into Au nanorods; third, prompt stripping of Hg atoms from Au nanorods; fourth, moderate diffusion from the inner core of Au nanorods. Under high Hg2+ concentrations, homogeneous spherical gold amalgam nanoalloys were obtained. These results demonstrate that the morphology and composition of individual gold amalgam nanoalloys can be precisely regulated electrochemically. Moreover, gold amalgam nanoalloys with intriguing optical properties,, such as modulated plasmonic lifetimes and,quality factor Q could be obtained. This may offer opportunities to extend applications in photovoltaic energy conversion and chemical sensing.