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Titolo:
The nucleation and growth of gold on silica
Autore:
Luo, K; Kim, DY; Goodman, DW;
Indirizzi:
Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA Texas A&M Univ College Stn TX USA 77842 t Chem, College Stn, TX 77842 USA Hallym Univ, Dept Chem, Seoul, South Korea Hallym Univ Seoul South Korea allym Univ, Dept Chem, Seoul, South Korea
Titolo Testata:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
fascicolo: 1-2, volume: 167, anno: 2001,
pagine: 191 - 198
SICI:
1381-1169(20010220)167:1-2<191:TNAGOG>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
ULTRATHIN METAL-FILMS; ELECTRONIC-STRUCTURE; MODEL CATALYSTS; BINDING-ENERGIES; OXIDE SURFACES; CLUSTERS; AU; PARTICLES; SIO2; XPS;
Keywords:
nucleation; silica; auger electron spectroscopy;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Goodman, DW Texas A&M Univ, Dept Chem, POB 30012, College Stn, TX 77842 USA Texas A&M Univ POB 30012 College Stn TX USA 77842 TX 77842 USA
Citazione:
K. Luo et al., "The nucleation and growth of gold on silica", J MOL CAT A, 167(1-2), 2001, pp. 191-198

Abstract

The nucleation and growth of Au clusters supported on SiO2/Mo(1 1 0) has been studied by X-ray photoelectron spectroscopy (XPS), low energy ion scattering (LEIS), and temperature programmed desorption (TPD). Stoichiometric ultra-thin SiO2 films were synthesized and characterized by Auger electron spectroscopy (AES) and XPS. At 300 K, the growth mode of Au at fractional monolayer coverages is quasi-two-dimensional (2D); at higher coverages, three-dimensional (3D) growth was found with no evidence of a significant chemical interaction between gold and silica. Annealing Au/SiO2/Mo(1 1 0) to 1000K led to sintering of the gold clusters. The desorption activation energies for Au coverages <0.2 monolayer equivalents were determined by TPD to be significantly lower than the sublimation energies found for higher coverages of Au clusters and for bulk gold. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 23/09/20 alle ore 05:44:14