Effect of heat treatment on Langmuir-Blodgett films of a C60 adduct

A thermal dissociation method was employed to fabricate the Langmuir-Blodge tt (LB) films of C60. A C60 adduct with an amphiphilic anthracene bearing a carboxylic soup (C60-AN) was synthesized as the precursor molecule. C60-AN formed a monolayer at the air-water interface. The monolayers were transfe rred on solid substrates to form LB films using a horizontal lifting method . The LB films were subjected to heat treatments and their structural chang e was investigated by using UV-visible and LR spectroscopies. Most of the C 60-AN molecules were dissociated to C60 and amphiphilic anthracenes at 100 degreesC followed by the exclusion of the anthracene moiety from the LB fil ms. The thermal dissociation proceeded more at higher temperatures. At 200 degreesC, the dissociation proceeded completely, although a certain form of hydrocarbon remained in the LB films. All the materials disappeared when t he films were heated above 350 degreesC.