Influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2- nanocrystals.
DOHCEVIC-MITROVIC, Zorana D.; ARAÚJO, Vinicius D.; RADOVIC, Marko; A?KRABIC, Sonja; COSTA, Guilherme R.; BERNARDI, Maria Inês Basso; DJOKIC, Dejan M.; STOJADINOVIC, Bojan; NIKOLIC, Marko G.
DOHCEVIC-MITROVIC, Zorana D.; ARAÚJO, Vinicius D.; RADOVIC, Marko; A?KRABIC, Sonja; COSTA, Guilherme R.; BERNARDI, Maria Inês Basso; DJOKIC, Dejan M.; STOJADINOVIC, Bojan; NIKOLIC, Marko G.
Abstract: Ultrafine pure and cobalt doped SnO2- nanocrystals (Sn1-xCoxO2- , 0 x 0.05) were synthesized by microwave-assisted hydrothermal method. The as-prepared nanocrystals have single phase tetragonal rutile structure. With increase of Co content (x > 0.01), Co entered into SnO2 lattice in mixed Co2+/Co3+ state. Pronounced blue shift of the band gap with cobalt doping originated from the combined effect of quantum confinement and Burnstain-Moss shift. Raman and photoluminescence study revealed oxygen deficient structure of SnO2- for which the prevalent defects are in the form of in-plane oxygen vacancies. Co-doping induced decrease of in-plane oxygen vacancy concentration and luminescence quenching. SnO2- exhibited significantly better photocatalytic activity under UV light irradiation, than Co-doped samples due to better UV light absorption and increased concentration of in-plane oxygen vacancies which, as shallow donors, enable better electron-hole separation and faster charge transport.
@article={002997904,author = {DOHCEVIC-MITROVIC, Zorana D.; ARAÚJO, Vinicius D.; RADOVIC, Marko; A?KRABIC, Sonja; COSTA, Guilherme R.; BERNARDI, Maria Inês Basso; DJOKIC, Dejan M.; STOJADINOVIC, Bojan; NIKOLIC, Marko G.},title={Influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2- nanocrystals},journal={Processing and Application of Ceramics},note={v. 14, n. 2, p. 102-112},year={2020}}