Photodeposition of Pt on Colloidal CdS and CdSe/CdS Semiconductor Nanostructures
CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB
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In this communication, we report on the photodeposition of Pt on colloidal CdS and CdSeCdS coreshell nanocrystals. Among the II-VI semiconductors, CdS is of particular interest because it has the correct band alignment for water photolysis and has been demonstrated to be photocatalytically active. We have found that the photoexcitation of CdS and CdSeCdS in the presence of an organometallic Pt precursor leads to deposition of Pt nanoparticles on the semiconductor surface. Stark differences are observed in the Pt nanoparticle location on the two substrates, and the photodeposition can be completely inhibited by the modification of the semiconductor surface. Our results suggest that tuning of the semiconductor band structure, spatial organization and surface chemistry should be crucial in the design of photocatalytic nanostructures.
- Physical Chemistry
- Radiation and Nuclear Chemistry
- Solid State Physics