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Open AccessArticle

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

by Mahdi Ilka 1, Susanta Bera 1,2,3 and Se-Hun Kwon 1,2,3,*
1
School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
2
Global Frontier R&D Center for Hybrid Interface Materials, Pusan National University, Busan 46241, Korea
3
Institute of Materials Technology, Pusan National University, Busan 46241, Korea
*
Author to whom correspondence should be addressed.
Materials 2018, 11(6), 904; https://doi.org/10.3390/ma11060904
Received: 19 April 2018 / Revised: 14 May 2018 / Accepted: 24 May 2018 / Published: 28 May 2018
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 (PEC) and photocatalytic activities compared to the LS SnO2. The presence of a comparatively large number of surface defects due to its high surface area may enhance the photochemical activity by reducing the recombination rate of the photogenerated charges. View Full-Text
Keywords: low temperature solution method; SnO2 nanoparticles; surface defects; photoelectrochemical activity; photocatalytic activity low temperature solution method; SnO2 nanoparticles; surface defects; photoelectrochemical activity; photocatalytic activity
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MDPI and ACS Style

Ilka, M.; Bera, S.; Kwon, S.-H. Influence of Surface Defects and Size on Photochemical Properties of SnO2 Nanoparticles. Materials 2018, 11, 904.

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