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J. Korean Ceram. Soc. > Volume 50(1); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(1): 50.
doi: https://doi.org/10.4191/kcers.2013.50.1.50
박막 산화티타늄과 Sr4Al14O25 축광체를 조합한 복합소재의 벤젠가스에 대한 광촉매 반응
김승우, 김정식
서울시립대학교 신소재공학과
The Photocatalytic Reaction of the Thin Film TiO2-Sr4Al14O25 Phosphors for Benzene Gas
Seung-Woo Kim, Jung-Sik Kim
Department of Materials Science and Engineering, The University of Seoul
Phosphorescent materials coated with titanium dioxide were fabricated and photocatalytic reactions between these materials and VOCs gases were examined. A thin film (approx. 100 nm) of nanosized $TiO_2$ was deposited on the $Sr_4Al_{14}O_{25}$ : $Eu^{2+}$, $Dy^{3+}$, $Ag^+$ phosphor using low-pressure chemical vapor deposition (LPCVD). The characteristics of the photocatalytic reaction were examined in terms of the decomposition of benzene gas using a gas chromatography (GC) system under ultraviolet (${lambda}$ = 365 nm) and visible light (${lambda}$ > 420 nm) irradiation. $TiO_2$-coated $Sr_4Al_{14}O_{25}$ : $Eu^{2+}$, $Dy^{3+}$, $Ag^+$ phosphor showed different photocatalytic behavior compared with pure $TiO_2$. $TiO_2$-coated phosphorescent materials showed a much faster photocatalytic decomposition of benzene gas under visible irradiation compared to the pure $TiO_2$ for which the result was practically negligible. This suggests that the extension of the absorption wavelength to visible light occurred through energy band bending by a heterojunction at the interface of the $Sr_4Al_{14}O_{25}-TiO_2$ composite. Also, the $Sr_4Al_{14}O_{25}-TiO_2$ composite showed the photocatalytic decomposition of benzene in darkness due to the photon light emitted from the $Sr_4Al_{14}O_{25}$ phosphors.
Key words: Chemical vapor deposition (CVD), Photocatalyst, $TiO_2$, $Sr_4Al_{14}O_{25}-TiO_2$ composite, VOCs
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