ISSN:
1572-879X
Schlagwort(e):
Scanning tunneling microscopy (STM)
;
scanning tunneling spectroscopy (STS)
;
silver catalysts
;
Pt catalysts
;
STM study of Ag and Pt catalysts
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract Scanning tunneling microscopic studies of silver catalysts dispersed on highly oriented pyrolitic graphite (HOPG) with 2, 5 and 10 wt% metal loading prepared by wet impregnation and hydrogen reduction show spherical crystallites, with the 2 wt% catalysts having an average crystallite size of ∼ 2 nm and the 5 and 10 wt% catalysts with size distributions of 2–5 and 4–12 nm respectively. The Ag catalysts prepared by NaBH4 reduction show a narrower size distribution. Pt/HOPG catalysts with 2 and 5 wt% metal loading prepared by wet-impregnation and hydrogen reduction show large (2–11 nm) raft-like crystallites; small crystallites (∼ 1 nm) could be obtained by NaBH4 reduction. Tunneling spectroscopic measurements reveal the nonmetallic nature of crystallites on the surface of Ag(2 wt%)/HOPG as well as Pt/HOPG prepared by NaBH4 reduction.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00812129
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