Influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2-δ nanocrystals | Zendy

Z. DohčevićMitrović | Zendy; V. D. Araújo | Zendy; Marko Radović | Zendy; Sonja Aškrabić | Zendy; Guilherme Costa | Zendy; Maria Inês Basso Bernardi | Zendy; Dejan M. Djokić | Zendy; Bojan Stojadinović | Zendy; Marko G. Nikolić | Zendy

Open Access

Influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2-δ nanocrystals

Author(s) -

Z. DohčevićMitrović,

V. D. Araújo,

Marko Radović,

Sonja Aškrabić,

Guilherme Costa,

Maria Inês Basso Bernardi,

Dejan M. Djokić,

Bojan Stojadinović,

Marko G. Nikolić

Publication year - 2020

Publication title -

processing and application of ceramics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.326

H-Index - 15

eISSN - 2406-1034

pISSN - 1820-6131

DOI - 10.2298/pac2002102d

Subject(s) - materials science , photoluminescence , tetragonal crystal system , doping , raman spectroscopy , nanocrystal , photocatalysis , cobalt , absorption edge , rutile , luminescence , band gap , oxygen , photochemistry , analytical chemistry (journal) , nanotechnology , chemical engineering , crystallography , optoelectronics , crystal structure , optics , chemistry , catalysis , biochemistry , physics , engineering , organic chemistry , metallurgy , chromatography

Ultrafine pure and cobalt doped SnO2-δ nanocrystals (Sn1-xCoxO2-δ, 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-δ 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-δ 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. [Project of the Serbian Ministry of Education, Science and Technological Development]

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