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Semiconductor−Metal Nanocomposites. Photoinduced Fusion and Photocatalysis of Gold-Capped TiO2 (TiO2/Gold) Nanoparticles

Dawson, Amy, Kamat, Prashant V.·2001·The Journal of Physical Chemistry B
DOI 10.1021/jp0033263
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Abstract

Semiconductor/metal composite nanoparticles have been synthesized by chemically reducing HAuCl 4 on the surface of preformed TiO 2 nanoparticles. These gold-capped TiO 2 nanoparticles (particle diameter 10−40 nm) were stable in acidic (pH 2−4) aqueous solutions. At low [TiO 2 ]:[Au] ratio (<1:1), these composite nanoparticles are bigger in size (20−40 nm) and readily undergo aggregation. The TiO 2 /Au nanoparticles with TiO 2:Au ratio ≥1:10 were relatively stable to 532 nm laser irradiation. On the other hand 532 nm laser pulse excitation of aggregated nanoparticles ([TiO 2 ]:[Au] ≤ 1:1) led to morphological changes as they fused to produce large-size particles. Laser-induced melting/fusion was confirmed from the growth in the particle size as well as the disappearance of the aggregation absorption band. The process of melting and fusion occurred with an apparent rate constant of 1.25 × 10 9 s -1 . The role of the gold layer in promoting the photocatalytic charge transfer has been probed using thiocyanate oxidation at the semiconductor interface. More than 40% enhancement in the oxidation efficiency is seen with TiO 2 /Au nanoparticles capped with low concentration of the noble metal.

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Cited by

Metadata

Authors
Dawson, A., & Kamat, P. V.
Venue
The Journal of Physical Chemistry B
Publisher
American Chemical Society (ACS)
Published
2001-01-04
Volume
105
Issue
5
Pages
960-966
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
DOI
10.1021/jp0033263
OpenAlex
W2068513062
Cited by
463
References
1
FWCI
17.29
Type
journal article
Language
en
Open access
closed

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