Engineering of facets, band structure, and gas-sensing properties of hierarchical Sn2+-Doped SnO2 nanostructures

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Hongkang Wang
  • Kunpeng Dou
  • Tak Fu Hung
  • Feihu Zhang
  • Jiaqiang Xu

Detail(s)

Original languageEnglish
Pages (from-to)4847-4853
Journal / PublicationAdvanced Functional Materials
Volume23
Issue number38
Online published9 Apr 2013
Publication statusPublished - 11 Oct 2013

Abstract

Hierarchical SnO2 nanoflowers, assembled from single-crystalline SnO2 nanosheets with high-index (113) and (102) facets exposed, are prepared via a hydrothermal method using sodium fluoride as the morphology controlling agent. Formation of the 3D hierarchical architecture comprising of SnO2 nanosheets takes place via Ostwald ripening mechanism, with the growth orientation regulated by the adsorbate fluorine species. The use of Sn(II) precursor results in simultaneous Sn2+ self-doping of SnO 2 nanoflowers with tunable oxygen vacancy bandgap states. The latter further results in the shifting of semiconductor Fermi levels and extended absorption in the visible spectral range. With increased density of states of Sn2+-doped SnO2 selective facets, this gives rise to enhanced interfacial charge transfer, that is, high sensing response, and selectivity towards oxidizing NO2 gas. The better gas sensing performance over (102) compared to (113) faceted SnO2 nanostructures is elucidated by surface energetic calculations and Bader analyses. This work highlights the possibility of simultaneous engineering of surface energetics and electronic properties of SnO2 based materials. Flower-like hierarchical SnO2 nanostructures are assembled from single-crystalline SnO2 nanosheets with high-index (113) and (102) exposed facets. Sn2+ self-doping leads to formation of tunable oxygen vacancy bandgap states and extended absorption in the visible spectral range. This work highlights the possibility of simultaneous engineering of surface energetics and electronic properties of SnO2 based materials. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Research Area(s)

  • band structure calculations, doping, gas sensing properties, morphology control, SnO2 nanostructures

Citation Format(s)

Engineering of facets, band structure, and gas-sensing properties of hierarchical Sn2+-Doped SnO2 nanostructures. / Wang, Hongkang; Dou, Kunpeng; Teoh, Wey Yang; Zhan, Yawen; Hung, Tak Fu; Zhang, Feihu; Xu, Jiaqiang; Zhang, Ruiqin; Rogach, Andrey L.

In: Advanced Functional Materials, Vol. 23, No. 38, 11.10.2013, p. 4847-4853.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal