Journal
CHEMPHYSCHEM
Volume 10, Issue 8, Pages 1270-1273Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200900001
Keywords
chemisorption; gold; nanoparticles; photoemission spectroscopy; silica
Funding
- Korea government (MOST) [R01-2007-000-10280-0]
- Korea Ministry of Knowledge Economy
- Korean Government (MOEHRD, Basic Research Promotion Fund [KRF-2006-312-C00513]
- National Research Foundation of Korea [2006-312-C00513, R01-2007-000-10280-0, 2008-56529, 2007-0053237] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The size-dependent variation of the. electronic and chemical properties of Au nanoparticles formed on native Si oxide surfaces is investigated using. synchrotron radiation photoemission spectroscopy and ultraviolet photoelectron spectroscopy. The adsorption reactivity toward butanethiol adsorption initially increases with decreasing particle size; however, the reactivity of Au nanoparticles becomes gradually lower below a size of similar to 0.8 nm. The photoemission spectral changes suggest a metal-insulator transition, accompanied by negative charge transfer from the nanoparticles to the support, which may be the source of the chemical inertness of small Au nanoparticles.
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