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http://dx.doi.org/10.3740/MRSK.2008.18.7.389

Synthesis and Photocatalytic Activity of Ag Spot-coated TiO2-SrO Composite Powders  

Han, Jae-Kil (Department of Surface & Nano Technology, Songdo Techno Park)
Kim, Hyeong-Chul (Department of Computer Aided Mechanical Design, Incheon City College)
Hong, Won-Seok (Environmental System Center, Korea Institute of Machinery and Materials)
Choi, Sung-Chang (Department of Surface & Nano Technology, Songdo Techno Park)
Publication Information
Korean Journal of Materials Research / v.18, no.7, 2008 , pp. 389-393 More about this Journal
Abstract
Nano-sized $TiO_2$-60 wt% SrO composite powders were synthesized by a sol-gel method using titanium isopropoxide and $Sr(OH)_2\;{\cdot}\;8H_2O$ as precursors. 3, -5, -7 wt%Ag spot-coated $TiO_2$-60 wt% SrO composite powders were synthesized by a Ag electroless deposition method using $TiO_2$-60 wt% SrO composite powders calcined at $1050^{\circ}C$, which mainly exhibited the $SrTiO_3$phase. However, a small number of rutile $TiO_2$, $Sr_2TiO_4$ and $SrO_2$ phases were also detected. In the Ag spot-coated powders synthesized by electroless deposition, nano-sized particles about 5-25 nm in diameter adhered to the $TiO_2$-60 wt% SrO composite powders. The photocatalytic activity of Ag spot-coated $TiO_2$-SrO and $TiO_2$-SrO composite powders for degradation of phenol showed that all of $TiO_2$-SrO composite powders were highly active under UV light irradiation. 7 wt%Ag spot-coated $TiO_2$-60wt.%SrO composite powders had a relatively higher photocatalytic activity than did $TiO_2$-SrO composite powders under visible light.
Keywords
nanoparticle; photoactivity; sol-gel method;
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