Title: | Effect of plasma processing gas composition on the nitrogen-doping status and visible light photocatalysis of TiO2 |
Authors: | Chen, Chienchih Bai, Hsunling Chang, Chungliang 環境工程研究所 Institute of Environmental Engineering |
Issue Date: | 25-Oct-2007 |
Abstract: | 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 |
Journal: | JOURNAL OF PHYSICAL CHEMISTRY C |
Volume: | 111 |
Issue: | 42 |
Begin Page: | 15228 |
End Page: | 15235 |
Appears in Collections: | Articles |
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