Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 243, Issue 2, Pages 326-330Publisher
ACADEMIC PRESS INC
DOI: 10.1006/jcis.2001.7861
Keywords
Pt; nanoclusters; thiol; amine; XPS; ligand effect
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Platinum nanoclusters of average size 1.3 nm, modified with alkylamine, and alkylthiol, were prepared by a simple phase-transfer method using a small Pt nanocluster stabilized by glycol and OH- as a building block. Transmission electron microscopy, thermogravimetric analysis, H-1 NMR, and X-ray photoelectron spectroscopy analyses were carried out on these metal nanoclusters. It was observed that the Pt 4f binding energies in the same-sized Pt nanoclusters modified with alkylamine, alkylthiol, PVP, PVA, or PPh3 increase by 0.5-0.8 eV relative to those of bulk Pt. The shifts in the binding energies are caused by a size effect of the small Pt core and a ligand effect from the modifiers. By deducing the small size effect, the ligand effect on the Pt 4f binding energies was studied. (C) 2001 Academic Press.
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