Photodeposition of Pt on Colloidal CdS and CdSe/CdS Semiconductor Nanostructures

reportActive / Technical Report | Accession Number: ADA512991 | Open PDF

Abstract:

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.

Author(s):
Dukovic, Gordana ; Merkle, Maxwell G. ; Nelson, James H. ; Hughes, Steven M. ; Alivisatos, A. P.
Author Organization(s):
CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB
Supplementary Note:
Sponsored in part by DOE. DOI: 10.21236/ADA512991
Pagination:
0012

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
LBNL-969E
Contract/Grant Number(s):
FA9550-06-1-0488, DE-AC02-05CH11231
Monitor Series:
AFOSR/VA
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_1.2.3_Educating; JCA_5.3_Planning; JCA_1.2.7_Experimentation
Modernization Areas:
Microelectronics
Communities of Interest:
Advanced Electronics
Descriptor(s):
*NANOSTRUCTURES, *CADMIUM SULFIDES, *PLATINUM, *SEMICONDUCTORS, CADMIUM SELENIDES, NANOPARTICLES, DEPOSITION, PHOTOCHEMICAL REACTIONS, COLLOIDS
Field(s)/Group(s):
Physical Chemistry, Radiation and Nuclear Chemistry, Solid State Physics
Keyword(s):
*PHOTODEPOSITION, NANOCRYSTALS, HETEROSTRUCTURES, NANORODS, PHOTOCATALYSIS
Report Date:
2008 Sep 22
Creation Date:
2010 Feb 03