Capped semiconductor colloids: Synthesis and photochemistry of CdS capped SnO2 nanocrystallites |
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| Authors: | Robert Kennedy Ignacio Martini Greg Hartland and Prashant V Kamat |
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| Institution: | (1) Department of Chemistry, University of Notre Dame, 46556 Notre Dame, IN, USA;(2) Radiation Laboratory, University of Notre Dame, 46556 Notre Dame, IN, USA |
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| Abstract: | Cds-capped SnO2 (CdS@SnO2) and SiO2 (CdS@SiO2) colloids of 50–80 ? in diameter have been prepared in aqueous medium. Significant quenching of CdS emission is observed
in the CdS@SnO2 system as the electrons are injected from the excited CdS shell into the SnO2 core. Photoinduced charge separation in this system also results in transient bleaching in the 450 nm region. Picosecond
laser flash photolysis studies of composite semiconductor nanoclusters that highlight the effect of the metal oxide core on
the photophysical properties of the outer CdS shell are described.
Contribution No. 3961 from the Notre Dame Radiation Laboratory, USA |
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| Keywords: | CdS-capped SnO2 and SiO2 colloids composite semiconductor systems emission properties molecular devices |
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