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http://dx.doi.org/10.9713/kcer.2019.57.2.259

Tuning of Electro-optical Properties of Nano-structured SnO2:Ga Powders in a Micro Drop Fluidized Reactor  

Lim, Dae Ho (Greenhouse Gas Laboratory, Korea Institute of Energy Research)
Yang, Si Woo (Department of Chemical Engineering, Chungnam National University)
Yoo, Dong June (Department of Chemical Engineering, Chungnam National University)
Lee, Chan Gi (Advanced Materials & Processing Center, Institute for Advanced Engineering)
Kang, Yong (Department of Chemical Engineering, Chungnam National University)
Publication Information
Korean Chemical Engineering Research / v.57, no.2, 2019 , pp. 259-266 More about this Journal
Abstract
Tuning of electro-optical properties of nano-structured $SnO_2:Ga$ powders in a micro drop fluidized reactor (MDFR) was highly effective to enhance the activities of powders to be used as sensor materials. The tuning was conducted continuously in a facile one-step process during the formation of powders. The microscopic hydrodynamic forces affected the band gap structure and charge transfer of $SnO_2:Ga$ powders through the oxygen and interfacial tin vacancies by providing plausible pyro-hydraulic conditions, which resulted in the decrease in the electrical resistance of the materials. The analyses of room-temperature photoluminescence (PL) spectra and FT-IR exhibited that the tuning could improve the surface activities of $SnO_2:Ga$ powders by adjusting the excitation as well as separation of electrons and holes, thus maximizing the oxygen vacancies at the surface of the powders. The scheme of photocatalytic mechanism of $SnO_2:Ga$ powders was also discussed.
Keywords
$SnO_2:Ga$ powder; One-step continuous process; Pyro-hydraulic reaction; Fluidized reactor; Chemical sensing;
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