Korean Chemical Engineering Research, Vol.57, No.2, 259-266, 2019
Tuning of Electro-optical Properties of Nano-structured SnO2:Ga Powders in a Micro Drop Fluidized Reactor
Tuning of electro-optical properties of nano-structured SnO2: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 SnO2: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 SnO2: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 SnO2:Ga powders was also discussed.
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