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Titolo:
Structural and chemical modifications in Cu-supported C-60 thin films exposed to an atmosphere of air or iodine
Autore:
Katz, EA; Faiman, D; Shtutina, S; Froumin, N; Polak, M; Isakina, AP; Yagotintsev, KA; Strzhemechny, MA; Strzhemechny, YM; Zaitsev, VV; Schwarz, SA;
Indirizzi:
Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, Ben Gurion Natl Solar Energy Ctr, IL-84990 Sede Boqer, Israel Ben Gurion Univ Negev Sede Boqer Israel IL-84990 4990 Sede Boqer, Israel Ben Gurion Univ Negev, Dept Phys, IL-81405 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-81405 1405 Beer Sheva, Israel Ben Gurion Univ Negev, Dept Mat, IL-81405 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-81405 1405 Beer Sheva, Israel Natl Acad Sci Ukraine, Verkin Inst Low Temp Phys & Engn, UA-310164 Kharkov, Ukraine Natl Acad Sci Ukraine Kharkov Ukraine UA-310164 -310164 Kharkov, Ukraine CUNY Queens Coll, Dept Phys, Flushing, NY 11367 USA CUNY Queens Coll Flushing NY USA 11367 Dept Phys, Flushing, NY 11367 USA
Titolo Testata:
PHYSICA B
fascicolo: 1-4, volume: 304, anno: 2001,
pagine: 348 - 356
SICI:
0921-4526(200109)304:1-4<348:SACMIC>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERSTITIAL SITES; DOPED C-60; SOLID C60; INTERCALATION; TRANSITION; FULLERENE; OXYGEN; SUPERCONDUCTIVITY; CONDUCTIVITY; DEPOSITION;
Keywords:
fullerene; thin films; crystal structure; diffusion; phase transition;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Katz, EA Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, Ben Gurion Natl Solar Energy Ctr, IL-84990 Sede Boqer, Israel Ben Gurion Univ NegevSede Boqer Israel IL-84990 Boqer, Israel
Citazione:
E.A. Katz et al., "Structural and chemical modifications in Cu-supported C-60 thin films exposed to an atmosphere of air or iodine", PHYSICA B, 304(1-4), 2001, pp. 348-356

Abstract

Structural and chemical changes in C-60 thin films, grown on a Cu substrate and exposed to air or I-2 atmosphere, at room temperature, were monitoredby X-ray diffraction., Auger electron and X-ray photoelectron spectroscopy. Exposure to air is demonstrated to result not only in oxygen diffusion but also in a counter diffusion of the metal from the substrate into the C-60matrix. In particular, 10 months of air-exposure led to the presence of Cuand O atoms at all depths over the sample and the formation of a complex which we refer to as CuxOyC60. The new phase is quasi-stable at room temperature, but a relatively short thermal annealing at 150 degreesC destroys it and restores the initial C-60 FCC lattice. After 10 min of exposure of the Cu-supported C-60 films to an I-2 atmosphere the Cu sub-layer disappears completely and macroscopic amounts of a stable CuI phase are formed over the entire thickness of the C-60 film. To explain the results a model of chemically-induced counter electro-diffusion is proposed. We propose the possibleusefulness of this counter diffusion approach for tailoring C-60-based materials doped with various compounds in the form of both phase-separated composites and solid solutions (intercalated fullerides). (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 01/10/20 alle ore 00:54:56