INIFTA   05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
In-situ Optical and Structural Studies on Photoluminesence Quenching in CdSe/CdS/Au Heterostructures
Autor/es:
ARNAUD DEMORTIERE; 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
Revista:
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2014 vol. 136 p. 2342 - 2350
ISSN:
0002-7863
Resumen:
We report here detailed in situ studies of nucleation and growth of Au on CdSe/CdS nano rods 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 nano rods 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−sulfur sites at the surface of semiconductor nanoparticles. This dominant process was overlooked in previous end-point studies on semiconductor/metal heterostructures.