Fabrication of SnO₂@SnS₂heterostructure with enhanced visible light photocatalytic activity

Abstract

SnO2@SnS2 heterojunction structures have been successfully fabricated by hydrothermal oxidation of SnS2 nanoparticles in H2O2 aqueous solution. The structure and photodegradation activity of the SnO2@SnS2 heterojunction were characterized. Results indicated that SnO2@SnS2 nanocomposite exhibited enhanced photocatalytic activities compared to pure SnS2 and SnO2 under visible-light irradiation. Based on the analysis of the related energy structures, a coupled band gap structure mode was proposed. It is believed that the tight heterojunction structure and the coupled band gap structure play important roles in facilitating interfacial electron transfer and in reducing self-radiative recombination of charges.