Gases sorption and oxygen photodesorption on/from solid-state fullerene and fullerene-like adsorbents

摘要

The results of study of sorption properties of fullerene and fullerene-like nanostructures with respect to molecular oxygen, nitrogen and helium are given. The influence of experimental conditions (time, gas pressure, temperature and structure of sample) on these properties is investigated. At an irradiation of fullerenes and others fullerene-like adsorbents by light of a laser or a pulse lamp an output in a gas phase of oxygen, adsorbed by these samples, was observed. At interaction photoexited fullerene and adsorbed oxygen there is a transfer of excitation to oxygen and the essential part of oxygen in a gas phase was in the exited singlet states. These effects are confirmed by experimental observation of luminescence pulses on the wavelengths 0.762 and 1.268 microns with specific pulse duration. The processes of formation and quenching of singlet oxygen at pulse photoexcitation and photodesorption are considered. The fullerene and fullerene-like coatings on glass, ceramic, and porous metal surfaces were investigated. Spectral and temporary distributions of singlet oxygen luminescence for various adsorbents surfaces were studied. The influence of adsorbents surfaces cooling of on singlet oxygen amount obtained in a gas phase and on luminescence intensity has been investigated. On the base of investigations of physical principles of the singlet oxygen generation during interaction of the oxygen molecules with the solid-state photoexcited fullerenes and carbon nanostructures was proposed and realized the prototype of the singlet oxygen generator for the fullerene-oxygen-iodine laser, working in the pulsed mode.