A Comparative XAFS Study of Gold-thiolate Nanoparticles and Nanoclusters

Tiopronin-capped gold nanoparticles and gold nanoclusters of sizes 3.0 and 1.5 nm, respectively, were investigated with XAFS at the gold L3-edge. The specific EXAFS fitting procedure is discussed for obtaining reliable fit parameters for each system. The difficulties and challenges faced when analys...

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Bibliographic Details
Published in:Journal of physics. Conference series 2013-01, Vol.430 (1), p.12029-6
Main Authors: Chevrier, D M, Chatt, A, Sham, T K, Zhang, P
Format: Article
Language:English
Subjects:
Fittings
Gold
Luminescence
Nanoclusters
Nanoparticles
Nanostructure
Physics
Titanium dioxide
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Summary:Tiopronin-capped gold nanoparticles and gold nanoclusters of sizes 3.0 and 1.5 nm, respectively, were investigated with XAFS at the gold L3-edge. The specific EXAFS fitting procedure is discussed for obtaining reliable fit parameters for each system. The difficulties and challenges faced when analysing EXAFS data for gold nanoparticles and nanoclusters are also mentioned. Fitting results for gold nanoparticles reveal a small amount of surface Au-thiolate interactions with a large Au-Au metal core. For gold nanoclusters, only a one-shell fit was obtainable. Instead of Au-Au metal core, long-range interactions are expected for gold nanoclusters. Tiopronin-capped gold nanoclusters are proposed to be polymeric in nature, which helps explain the observed red luminescence.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/430/1/012029