Aggregation of fullerene, C60, in benzonitrile

Nath, Sukhendu ; Pal, Haridas ; Palit, Dipak K. ; Sapre, Avinash V. ; Mittal, Jai P. (1998) Aggregation of fullerene, C60, in benzonitrile Journal of Physical Chemistry B, 102 (50). pp. 10158-10164. ISSN 1089-5647

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp9824149

Related URL: http://dx.doi.org/10.1021/jp9824149

Abstract

C60 solutions in benzonitrile have been found to show concentration dependent optical absorption behaviour. At lower concentrations (<100 µ M) the UV-vis absorption characteristics of C60 in benzonitrile are exactly similar to those in benzene and decalin. At higher concentrations (>100 µ M), however, the C60 solutions in benzonitrile show very broad absorption tail, extending beyond 900 nm. At higher concentrations the solutions are also visually opaque. From picosecond laser flash photolysis experiments it is seen that the triplet quantum yield of C60 in benzonitrile at higher concentrations (~400 µ M) is much less than unity and increases with the dilution while in decalin and benzene it is always close to unity and independent of the C60 concentration. Dynamic light scattering experiments indicate the presence of particles of mean size of about 250 nm in C60 solutions in benzonitrile with concentration >100 µ M, while in <100 µ M solutions no such particles have been observed. Such particles are also not observed for C60 solutions in benzene and decalin, even up to ~500 µ M. Scanning electron microscopy also shows particles of size ~250 nm. It is inferred that C60 forms aggregates in benzonitrile at concentrations >100 µ M and that the aggregated and the monomeric form of C60 are in equilibrium.

Item Type:Article
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ID Code:25582
Deposited On:04 Dec 2010 12:07
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