Ultrathin platinum nanoparticles encapsulated in a graphite lattice-prepared by a sonochemical approach

Citation
J. Walter et al., Ultrathin platinum nanoparticles encapsulated in a graphite lattice-prepared by a sonochemical approach, CHEM MATER, 13(5), 2001, pp. 1828-1833
Citations number
31
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
CHEMISTRY OF MATERIALS
ISSN journal
0897-4756 → ACNP
Volume
13
Issue
5
Year of publication
2001
Pages
1828 - 1833
Database
ISI
SICI code
0897-4756(200105)13:5<1828:UPNEIA>2.0.ZU;2-Q
Abstract
H2PtCl6 was intercalated into natural graphite by applying ultrasound to a mixture of graphite, H2PtCl6, CCl4, and SOCl2 for 3 days. X-ray diffraction data showed that the host lattice was partly intercalated by H2PtCl6. A mi xture consisting of a third and fourth stage together with unreacted graphi te was observed. The intercalation compound was suspended in acetone with h ydrogen flowing through while the sonication took place for 2 days. Transmi ssion electron microphotographs showed highly dispersed nanoparticles in a narrow size range inside the carbon lattice. X-ray photoelectron spectrosco py gave evidence that these particles are platinum metal (Pt-0). Particle t hickness estimated by X-ray diffraction indicated an average particle thick ness of two layers. Selected-area electron diffraction microphotographs sho wed a pattern that could be hexagonally indexed. A (2 x alpha (graphite)) s uperstructure was observed for those quasi-two-dimensional aggregates forme d by self-organization. This indicates a templating effect due to the carbo n lattice.