PHOTOCHEMICAL TRANSFORMATION OF C-60 AND C-70 FILMS

被引:223
作者
EKLUND, PC
RAO, AM
ZHOU, P
WANG, Y
机构
[1] Department of Physics and Astronomy, Center for Applied Energy Research, University of Kentucky, Lexington
基金
美国国家科学基金会;
关键词
FULLERENES; OPTICAL PROPERTIES; OXYGEN; POLYMERS;
D O I
10.1016/0040-6090(94)05704-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Thin solid films of C-60 and C-70 have been found to be sensitive to UV-visible light. In the absence of oxygen, which acts as a triplet state quencher, C-60 and C-70 have been observed to phototransform from a toluene-soluble to a toluene-insoluble state. This phototransformation has been studied via Raman and FTIR spectroscopies, UV-visible transmission spectroscopy and laser desorption mass spectroscopy. The results of these experiments have been interpreted as evidence for a phototransformation from a van der Waals solid to one in which the fullerenes are linked by covalent bonds. For C-60, it is proposed that a transformation to a polymeric solid has occurred, whereas a similar flux of UV-visible light applied to C-70 is proposed to lead to a random dimerization of the lattice and a much smaller population of higher oligomers. For both phototransformed C-60 and C-70, the covalent bonds between fullerenes can be broken thermally and the phototransformed material returns to the pristine, toluene-soluble state. UV-visible light can also be used to photochemically assist the diffusion of dioxygen into the interstitial voids in the solid C-60 and C-70 lattices. For C-60, a photochemical enhancement of the O-2 diffusion rate by a factor of similar to 10 is observed by alpha particle backscattering, leading to a stoichiometry of similar to C60O2. Similar to C-60-polyfullerene, C-60(O-2)(x) is also toluene insoluble. As a result, these C-60-based films might find photolithographic applications.
引用
收藏
页码:185 / 203
页数:19
相关论文
共 78 条
[1]  
ADAMS GB, UNPUB
[2]   ORDER-DISORDER TRANSITION IN POLYCRYSTALLINE-C60 FILMS [J].
AKERS, K ;
FU, KJ ;
ZHANG, P ;
MOSKOVITS, M .
SCIENCE, 1993, 259 (5098) :1152-1154
[3]   RAMAN STUDIES OF PHOTOCHEMICAL-REACTIONS IN FULLERENE FILMS [J].
AKSELROD, L ;
BYRNE, HJ ;
THOMSEN, C ;
MITTELBACH, A ;
ROTH, S .
CHEMICAL PHYSICS LETTERS, 1993, 212 (3-4) :384-390
[4]  
[Anonymous], 1970, PHOTOPHYSICS AROMATI
[5]   PHOTOPHYSICAL PROPERTIES OF C60 [J].
ARBOGAST, JW ;
DARMANYAN, AP ;
FOOTE, CS ;
RUBIN, Y ;
DIEDERICH, FN ;
ALVAREZ, MM ;
ANZ, SJ ;
WHETTEN, RL .
JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (01) :11-12
[6]   INTERCALATION OF MOLECULAR-SPECIES INTO THE INTERSTITIAL SITES OF FULLERENE [J].
ASSINK, RA ;
SCHIRBER, JE ;
LOY, DA ;
MOROSIN, B ;
CARLSON, GA .
JOURNAL OF MATERIALS RESEARCH, 1992, 7 (08) :2136-2143
[7]   (ETA-2-C70)IR(CO)CL(PPH3)2 - THE SYNTHESIS AND STRUCTURE OF AN ORGANOMETALLIC DERIVATIVE OF A HIGHER FULLERENE [J].
BALCH, AL ;
CATALANO, VJ ;
LEE, JW ;
OLMSTEAD, MM ;
PARKIN, SR .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1991, 113 (23) :8953-8955
[8]   VIBRATIONAL RAMAN AND INFRARED-SPECTRA OF CHROMATOGRAPHICALLY SEPARATED C60 AND C70 FULLERENE CLUSTERS [J].
BETHUNE, DS ;
MEIJER, G ;
TANG, WC ;
ROSEN, HJ ;
GOLDEN, WG ;
SEKI, H ;
BROWN, CA ;
DEVRIES, MS .
CHEMICAL PHYSICS LETTERS, 1991, 179 (1-2) :181-186
[9]   VIBRATIONAL SPECTROSCOPY OF C-60 AND C-70 TEMPERATURE-DEPENDENT STUDIES [J].
CHASE, B ;
HERRON, N ;
HOLLER, E .
JOURNAL OF PHYSICAL CHEMISTRY, 1992, 96 (11) :4262-4266
[10]   SORPTION OF HELIUM BY FULLERITE CRYSTALS AND FILMS [J].
CHEN, CP ;
MEHTA, S ;
FU, LP ;
PETROU, A ;
GASPARINI, FM ;
HEBARD, A .
PHYSICAL REVIEW LETTERS, 1993, 71 (05) :739-742