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

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

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 Co...

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Main Authors: Zorana D. Dohčević-Mitrović, Vinicius D. Araújo, Marko Radović, Sonja Aškrabić, Guilherme R. Costa, Maria Ines B. Bernardi, Dejan M. Djokić, Bojan Stojadinović, Marko G. Nikolić
Format: Article
Language:English
Published: University of Novi Sad 2020-05-01
Series:Processing and Application of Ceramics
Subjects:
sno2 nanopowders
wet-chemical synthesis
defects
optical properties
photocatalysis
Online Access:http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2048%2002.pdf
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spelling doaj-b33261c32f3143f787dac2ad39e531f72020-11-25T03:18:20ZengUniversity of Novi SadProcessing and Application of Ceramics1820-61312406-10342020-05-0114210211210.2298/PAC2002102DInfluence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2-δ nanocrystalsZorana D. Dohčević-Mitrović0Vinicius D. Araújo1Marko Radović2 Sonja Aškrabić3Guilherme R. Costa4Maria Ines B. Bernardi5 Dejan M. Djokić6Bojan Stojadinović7Marko G. Nikolić8Nanostructured Matter Laboratory, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, SerbiaNanoA-UACSA, Universidade Federal Rural de Pernambuco, UFRPE, Cabo de Santo Agostinho, PE, BrazilUniversity of Novi Sad, Group for Nano and Microelectronics, Biosense Institute, Novi Sad, SerbiaNanostructured Matter Laboratory, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, SerbiaInstituto de Física de São Carlos, Universidade de São Paulo, USP, 13560-970, São Carlos – SP, BrasilInstituto de Física de São Carlos, Universidade de São Paulo, USP, 13560-970, São Carlos – SP, BrasilNanostructured Matter Laboratory, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, SerbiaNanostructured Matter Laboratory, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, SerbiaInstitute of Physics Belgrade, University of Belgrade, P.O. Box 68, Pregrevica 118, 11080 Belgrade, SerbiaUltrafine 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.http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2048%2002.pdfsno2 nanopowderswet-chemical synthesisdefectsoptical propertiesphotocatalysis
collection DOAJ
language English
format Article
sources DOAJ
author Zorana D. Dohčević-Mitrović
Vinicius D. Araújo
Marko Radović
Sonja Aškrabić
Guilherme R. Costa
Maria Ines B. Bernardi
Dejan M. Djokić
Bojan Stojadinović
Marko G. Nikolić
spellingShingle Zorana D. Dohčević-Mitrović
Vinicius D. Araújo
Marko Radović
Sonja Aškrabić
Guilherme R. Costa
Maria Ines B. Bernardi
Dejan M. Djokić
Bojan Stojadinović
Marko G. Nikolić
Influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2-δ nanocrystals
Processing and Application of Ceramics
sno2 nanopowders
wet-chemical synthesis
defects
optical properties
photocatalysis
author_facet Zorana D. Dohčević-Mitrović
Vinicius D. Araújo
Marko Radović
Sonja Aškrabić
Guilherme R. Costa
Maria Ines B. Bernardi
Dejan M. Djokić
Bojan Stojadinović
Marko G. Nikolić
author_sort Zorana D. Dohčević-Mitrović
title Influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2-δ nanocrystals
title_short Influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2-δ nanocrystals
title_full Influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2-δ nanocrystals
title_fullStr Influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2-δ nanocrystals
title_full_unstemmed Influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine SnO2-δ nanocrystals
title_sort influence of oxygen vacancy defects and cobalt doping on optical, electronic and photocatalytic properties of ultrafine sno2-δ nanocrystals
publisher University of Novi Sad
series Processing and Application of Ceramics
issn 1820-6131
2406-1034
publishDate 2020-05-01
description 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.
topic sno2 nanopowders
wet-chemical synthesis
defects
optical properties
photocatalysis
url http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2048%2002.pdf
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