https://scholars.lib.ntu.edu.tw/handle/123456789/425158
Title: | Single-step synthesis of al-doped tio <inf>2</inf> nanoparticles using non-transferred thermal plasma torch | Authors: | Tsai, Cheng Yen HSING-CHENG HSI Bai, Hsunling Fan, Kuo Shuh |
Issue Date: | 1-Jan-2012 | Publisher: | IOP PUBLISHING LTD | Journal Volume: | 51 | Journal Issue: | 1 PART 2 | Source: | Japanese Journal of Applied Physics | Abstract: | Al-doped TiO 2 nanoparticles possessing visible-light photocatalytic activity were fabricated with an atmospheric-pressure thermal plasma system via a single-step direct combination of vaporized Ti, Al, and O 2 . Pure Ti and Al 2 O 3 powders and ultrahigh-purity O 2 were used as the precursors. The experimental results showed that the size of synthesized TiO 2 was between 10 and 105 nm. Nevertheless, the nanoparticles with sizes smaller than 50nm accounted for approximately 80% of the total number. The observed size reduction appeared to be the suppression on particle growth due to the introduction of Al species into TiO 2 crystal. The largest specific surface area of the Al-doped TiO 2 was 44m2g -1 . The anatase phase was noticeably decreased with increasing the Al2O3 addition. The absorption spectra of Al-doped TiO 2 shifted from UV to visible-light region with respect to an increase in Al 2 O 3 addition. Oxygen in the formed TiO 2 was found to be in TiO 2 crystal lattice and in surface hydroxyl groups. Both Ti4+ and Ti3+ existed in the formed TiO 2 . However, the Ti3 amount significantly increased with increasing Al 2 O 3 addition due to Al/Ti substitution and the resulted oxygen vacancy. © 2012 The Japan Society of Applied Physics. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/425158 | ISSN: | 00214922 | DOI: | https://api.elsevier.com/content/abstract/scopus_id/84863407905 10.1143/JJAP.51.01AL01 |
Appears in Collections: | 環境工程學研究所 |
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