A new route to self-assembled tin dioxide nanospheres: Fabrication and characterization

Zhengtao Dang, Bö Peng, Dong Chen, Fangqiong Tang, Anthony J. Muscat

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

Nearly monodispersed self-assembled tin dioxide (SnO2) nanospheres with intense photoluminescence (PL) were synthesized using a new wet chemistry technique. Instead of coprecipitating stannous salts, bulk tin (Sn) metal was oxidized at room temperature in a solution of hydrogen peroxide and deionized water containing polyvinylpyrrolidone (PVP) and ethylenediamine (EDA). SnO2 nanocrystals were produced with diameters of ∼3.8 nm that spontaneously self-assembled into uniform SnO2 nanospheres with diameters of ∼30 nm. Analysis was performed by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, selected area electron diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, UV-vis absorption spectroscopy, PL spectroscopy, and fluorescence lifetime measurements. The SnO2 nanospheres displayed room-temperature purple luminescence with an intense band at 394 nm (∼3.15 eV) and a high quantum yield of ∼ 15%, likely as a result of emission from the surface states of SnO2/PVP complexes. The present study could open a new avenue to large-scale synthesis of self-assembled functional oxide nanostructures with technological applications as purple emitters, biological labels, gas sensors, lithium batteries, and dye-sensitized solar cells.

Original languageEnglish (US)
Pages (from-to)11089-11095
Number of pages7
JournalLangmuir
Volume24
Issue number19
DOIs
StatePublished - Oct 7 2008

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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