文献类型：期刊文献

英文题名：Real-time monitoring for the morphological variations of single gold nanorods

作者：Xie, Tao[1,2];Jing, Chao[1,2];Ma, Wei[1,2];Ding, Zhifeng[3];Gross, Andrew James[4];Long, Yi-Tao[1,2]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China;[3]Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada;[4]Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England

年份：2015

卷号：7

期号：2

起止页码：511

外文期刊名：NANOSCALE

收录：;EI(收录号：20145100334280);WOS:【SCI-EXPANDED(收录号:WOS:000347245500018)】；

基金：This research was supported by 973 Program (2013CB733700), National Science Fund for Distinguished Young Scholars (21125522), and the National Natural Science Foundation of China (21327807, 21421004). Y.-T. Long thanks the support by Shanghai Science and Technology Committee (12JC1403500) and Eastern Scholar at Shanghai Institutions of Higher Learning.

语种：英文

外文关键词：Etching - Nanoribbons - Plasmons - Metal nanoparticles - Rayleigh scattering - High resolution transmission electron microscopy - Nanorods

摘要：The morphological characteristics of metal nanoparticles, particularly the shape, play an essential role in the optical, physical and chemical properties. In this work, we reported a transverse etching process to investigate the morphological variations of single gold nanorods (GNRs). Dark-field microscopy and Rayleigh scattering spectroscopy were used as complementary technologies to track the transverse etching process. Dark-field imaging with high spatial and temporal resolution could easily monitor the transverse etching process of GNRs in situ and in real time. Interactions between the scattering spectrum and the morphological variations were judiciously calculated within the dipole approximation by the Drude function. The calculated peak shift of GNRs (Delta lambda(max) = 17 nm) was obtained via the ratio of the long axis and short axis (aspect ratio) of GNRs from transmission electron microscopy. The average scattering peak shift (Delta lambda(max) = 22 nm) from Rayleigh scattering spectroscopy was in good agreement with the calculated peak shift. Monitoring the morphological variations of single GNRs enables us to track the transverse etching of GNRs at arbitrary time. This promises to be a useful method for the study of different nanomaterials and their spectral properties.