PREPARATION AND SURFACE OBSERVATION BY SCANNING PROBE MICROSCOPE OF C-60-CONTAINING POLYIMIDE LANGMUIR-BLODGETT-FILM

Langmuir-Blodgett (LB) film of C-60-containing polyimide were prepared via the corresponding polyamic acid alkyl amine salt (the precursor o f polyimide) LB film using the precursor method. Absorption bands in b oth the precursor and polyimide LB films deposited on quartz plate wer e observed at 208, 261 and 340 nm, which were typical absorption of C- 60. Changing of carbonyl absorption from the precursor polyamic acid a lkyl amine salt to polyimide, and removal of the long alkyl chain were elucidated by Fourier transform infrared spectroscopy (FTIR) spectra. The atomic force microscope (AFM) images of the precursor monolayer f ilm indicated the flat surface, whereas islands attributed to the self -aggregated alkyl chain were observed in the friction force microscope (FFM) image of the same area of AFM. After imidization by heating the precursor monolayer film at 160 degrees C for 3 h, holes with the dep th of 1.8 nm were seen at the place of the aggregated alkyl chain in t he precursor monolayer. (C) 1997 Elsevier Science S.A.