MASS-SPECTROMETRIC INVESTIGATION OF THE AGGREGATION AND COALESCENCE OF FULLERENES IN C-60-MODIFIED POLY(N-VINYLCARBAZOLE) BY UV-LASER ABLATION

The phenomena of aggregation and coalescence of fullerenes in the UV-l aser ablation time-of-flight mass spectrometric investigation of C-60- modified poly(N-vinylcarbazole) both in the positive and in the negati ve ion channels have been observed. The results indicate that in C-60 chemically modified PVK (C-60-PVK) copolymer the nascent fullerene fra gments ruptured from main chain can easily coalesce into large fullere nes through collisions, whereas in the C-60-doped PVK the aggregation and coalescence of C-60 were relative weak due to nonbounding action a nd incomplete charge transfer behavior between C-60 and PVK. Furthermo re, the photoinduced electron transfer behavior between C-60 and carba zole units in the C-60 chemically modified poly(N-vinylcarbazole) in b enzonitrile by laser flash photolysis at 355 nm has also been investig ated. Efficiency of the anion radical of C-60 in copolymer at 1080 nm is higher than that of the C-60-doped poly (N-vinylcarbazole) polymers . The formation of a C-60 radical anion may be ascribed to photoinduce d electron transfer between C-60 pendanted on the main chain backbone and the inter-, and intrachain carbazole units in the copolymer. (C) 1 997 John Wiley & Sons, Inc.