PREPARATION AND HIGH VISIBLE-LIGHT-INDUCED PHOTOCATALYTIC ACTIVITY OF CDSE AND CDSE-C_(60) NANOPARTICLES

摘要

Semiconductor oxides have been widely used in optical coating and microelectronics devices; their use to purify contaminants in air and water has been recognized more recently [1]. Photocatalytic reactions in semiconductors, such as splitting of water and decomposition of waste materials, have received special attention because of their possible application to the conversion of solar energy into chemical energy and to pollution control using solar energy [2]. In these investigations, various semiconductor materials such as TiO2, CdS, ZnS, ZnO, and WO3 have been used to study photocatalytic reduction of pollution in water [3], Photosensitization of stable, large-band gap semiconductors such as SnO2, TiO2, and ZnO in visible light using semiconducting photosensitizers such as CdS, CdSe, and CdTe has been a long-sought, ongoing goal in the area of photoelectrochemical solar-energy conversion. Fullerenes contain an extensively conjugated three-dimensional n system and can be described as having a closed-shell configuration consisting of 30 bonding molecular orbitals with 60 π-electrons. This material is also suitable for efficient electron-transfer reduction because of the minimal changes in structure and solvation associated with electron transfer [4], Cadmium selenide (CdSe) is an n-type semiconductor. Its bandgap energy is reported to be in the range from 1.65 to 1.8 eV. CdSe has been found to be suitable for various optoelectronic applications such as light-emitting diodes, laser diodes, catalysis, solar cells, and biological labeling.