In Situ Optical and Structural Studies on Photoluminesence Quenching in CdSe/CdS/Au Heterostructures
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- 作者：Arnaud Demortière ; Richard D. Schaller ; Tao Li ; Soma Chattopadhyay ; Galyna Krylova ; Tomohiro Shibata ; Paula C. dos Santos Claro ; Clare E. Rowland ; Jeffrey T. Miller ; Russell Cook ; Byeongdu Lee ; Elena V. Shevchenko
- 刊名：Journal of the American Chemical Society
- 出版年：2014
- 出版时间：February 12, 2014
- 年：2014
- 卷：136
- 期：6
- 页码：2342-2350
- 全文大小：630K
- ISSN：1520-5126
文摘
We report here detailed in situ studies of nucleation and growth of Au on CdSe/CdS nanorods using synchrotron SAXS technique and time-resolved spectroscopy. We examine structural and optical properties of CdSe/CdS/Au heterostructures formed under UV illumination. We compare the results for CdSe/CdS/Au heterostructures with the results of control experiments on CdSe/CdS nanorods exposed to gold precursor under conditions when no such heterostructures are formed (no UV illumination). Our data indicate similar photoluminescence (PL) quenching and PL decay profiles in both types of samples. Via transient absorption and PL, we show that such behavior is consistent with rapid (faster than 3 ps) hole trapping by gold鈥搒ulfur sites at the surface of semiconductor nanoparticles. This dominant process was overlooked in previous end-point studies on semiconductor/metal heterostructures.