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http://dx.doi.org/10.9713/kcer.2018.56.4.585

Characteristics of Nano-structured SiO2:Zn Hollow Powders Prepared in the Micro Drop Fluidized Reactor (MDFR) Process  

Yang, Si Woo (Department Chemical Engineering and Applied Chemistry, Chungnam National University)
Kang, Yong (Department Chemical Engineering and Applied Chemistry, Chungnam National University)
Kang, Ho (Ever Green Tech.)
Publication Information
Korean Chemical Engineering Research / v.56, no.4, 2018 , pp. 585-591 More about this Journal
Abstract
Characteristics of nano-structured $SiO_2:Zn$ hollow powders prepared in the micro drop fluidized reactor process were investigated with respect to bandgap energy and surface activity. The $SiO_2:Zn$ hollow powders were successfully prepared continuously in the one step process with reasonable production efficiency, with varying the amount of THAM (tris(hydroxymethyl)-aminomethane) additive and concentration of $Zn^{2+}$ ions. The doping of $Zn^{2+}$ ions into $SiO_2$ lattice led to the reduction of bandgap energy by forming the acceptor level of $Zn^{2+}$ below the conduction band of $Si^{4+}$ ions. The hollow shape also contributed to reduce the bandgap energy of $SiO_2:Zn$ powders. The doping of $Zn^{2+}$ ions into $SiO_2$ hollow powders could enhance the surface activity by forming SiO-H stretching and oxygen vacancies at the surface of $SiO_2:Zn$ powders.
Keywords
$SiO_2:Zn$ powders; Micro drop fluidized reactor; Hollow powders; Optical property;
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Times Cited By KSCI : 4  (Citation Analysis)
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