標題: Effect of plasma processing gas composition on the nitrogen-doping status and visible light photocatalysis of TiO2
作者: Chen, Chienchih
Bai, Hsunling
Chang, Chungliang
環境工程研究所
Institute of Environmental Engineering
公開日期: 25-十月-2007
摘要: The atmospheric pressure plasma enhanced nanoparticle synthesis (APPENS) process is applied to produce nitrogen (N) doped titania (TiO2) photocatalysts. With TTIP (titanium tetraisopropoxide; Ti(OC3H7)(4)) and water vapors as precursors, the effect of plasma and annealing gas composition on the N-doping status is identified by a cross comparison of the chemical shift of N atoms with those of Ti and O atoms. The activities of various types of N-doped photocatalysts are evaluated via the conversion of isopropyl alcohol (IPA). The results show that the N-doped TiO2 particles with O-x-Ti-N-y and -(NO) dopants are produced via N-2 plasma gas followed by air or N2 annealing gases. They have better visible and UV photocatalytic activities compared to the pure TiO2 photocatalysts prepared under O-2/Ar plasma and annealing gases. On the other hand, the N-doped TiO2 photocatalyst produced under N-2/O-2/Ar plasma gas and then annealed with pure N2 gas tends to have an additional dopant of -(NO2), but its photocatalytic activity is even worse than those of the pure TiO2 photocatalysts. The results reveal that the Ox-Ti-Ny and -(NO) dopants may have positive effects on the visible light photocatalytic activity while the -(NO2) dopant tends to have a negative effect on the visible light photocatalytic activity.
URI: http://dx.doi.org/10.1021/jp0716233
http://hdl.handle.net/11536/10223
ISSN: 1932-7447
DOI: 10.1021/jp0716233
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 111
Issue: 42
起始頁: 15228
結束頁: 15235
顯示於類別:期刊論文


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