Influence of Surface Defects and Size on Photochemical Properties of SnO₂ Nanoparticles

Materials
Mahdi IlkaSe-Hun Kwon

Abstract

We report the successful synthesis of surface defective small size (SS) SnO₂ nanoparticles (NPs) by adopting a low temperature surfactant free solution method. The structural properties of the NPs were analyzed using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The presence of surface defects, especially oxygen vacancies, in the sample were characterized using micro-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and photoluminescence emission. The Brunauer⁻Emmet⁻Teller (BET) nitrogen adsorption⁻desorption isotherms demonstrated the superior textural properties (high surface area and uniform pore size) of SS SnO₂ compared to large size (LS) SnO₂. A comparable study was drawn between SS SnO₂ and LS SnO₂ NPs and a significant decrease in the concentration of surface defects was observed for the LS sample. The results showed that surface defects significantly depend upon the size of the NPs. The surface defects formed within the band gap energy level of SnO₂ significantly participated in the recombination process of photogenerated charge carriers, improving photochemical properties. Moreover, the SS SnO₂ showed superior photoelectrochemical (P...Continue Reading

References

Apr 28, 2007·Accounts of Chemical Research·Markus Niederberger
Mar 23, 2011·Chemical Communications : Chem Comm·Mingyang XingBaozhu Tian
Jul 13, 2012·ACS Applied Materials & Interfaces·Junpeng WangYing Dai
Oct 18, 2012·Chemical Society Reviews·Frank E Osterloh
Jun 28, 2013·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Suparna Sadhu, Amitava Patra
Apr 30, 2014·Journal of the American Chemical Society·Fengcai LeiYi Xie
Jan 24, 2017·ACS Applied Materials & Interfaces·Susanta BeraSunirmal Jana

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