以TiCl3为钛源,采用溶胶一凝胶法,在500℃(1h)烧结获得非金属离子(硫)掺杂TiO2的纳米粉体,利用XRD,FT-IR,UV-vis,ESEM,Zeta电位,XRF,TPD等表征S/TiO2结构特性.结果表明,硫掺杂有利于其向金红石相转变,低掺杂浓度(2at%)时,硫主要以S4+形式存在,当掺杂量为25at%时,部分掺杂硫以S2-形式替代O2-,由于两者间的电负性差异,导致表面上Ti3+、Ti4+周围的电子云密度增加,从而提高样品对氧气的吸附活性,使其表面的富余电子向吸附氧转移,提高了氧敏特性.S/TiO2敏感体表面的吸附氧以氧分子形式脱附(≤550℃),而在高温(≥600℃)下主要以SO2形式脱附.
参考文献
[1] | Du J;Choy K .Electrostatic spray assisted vapour deposi-tion of TiO2-based films[J].Solid State Ionics,2004,173:119-124. |
[2] | Sharma R K;Bhatnagar M C;Sharma G L .Mechanism of highly sensitive and fast response Cr doped TiO2 oxygen gas sensor[J].Sensors and Actuators B:Chemical,1997,45:209-215. |
[3] | 范信强,潘海波,黄金陵,陈耐生.Mo6+掺杂TiO2纳米材料的表面性能及氧敏特性[J].功能材料与器件学报,2005(04):489-491. |
[4] | Meixner H;Lampe U .Metal oxide sensors[J].Sensors and Actuators B:Chemical,1996,33:198-202. |
[5] | Zakrzewska K .Gas sensing mechanism of TiO2-based thin films[J].Vacuum: Technology Applications & Ion Physics: The International Journal & Abstracting Service for Vacuum Science & Technology,2004(2):335-338. |
[6] | Guo PF;Pan HB .Selectivity of Ti-doped In2O3 ceramics as an ammonia sensor[J].Sensors and Actuators, B. Chemical,2006(2):762-767. |
[7] | Irie H;Watanabe Y;Hashimoto K .Nitrogen-concentra-tion dependence on photocatalytic activity of TiO2-xNx powders[J].Journal of Physical Chemistry B,2003,107:5483-5486. |
[8] | Reddy KM;Baruwati B;Jayalakshmi M;Rao MM;Manorama SV .S-, N- and C-doped titanium dioxide nanoparticles: Synthesis, characterization and redox charge transfer study[J].International Journal of Quantum Chemistry,2005(11):3352-3358. |
[9] | Sulfur-doping of rutile-titanium dioxide by ion implantation: Photocurrent spectroscopy and first-principles band calculation studies[J].Journal of Applied Physics,2003(9):5156-5160. |
[10] | Yang Q;Xie C;Xu Z et al.Synthesis of highly active sulfate-promoted rutile titania nanoparticles with a re-sponse to visible light[J].Journal of Physical Chemistry B,2005,109:5554-5560. |
[11] | Ho WK;Yu JC;Lee SC .Low-temperature hydrothermal synthesis of S-doped TiO2 with visible light photocatalytic activity[J].International Journal of Quantum Chemistry,2006(4):1171-1176. |
[12] | Kan Takeshita;Akira Yamakata;Taka-aki Ishibashi;Hiroshi Onishi;Kazumoto Nishijima;Teruhisa Ohno .Transient IR absorption study of charge carriers photogenerated in sulfur-doped TiO_2[J].Journal of Photochemistry and Photobiology, A. Chemistry,2006(2/3):269-275. |
[13] | Tsutomu Umebayashi;Tetsuya Yamaki;Sigeru Tanaka;Keisuke Asai .Visible light-induced degradation of methylene blue on S-doped TiO_2[J].Chemistry Letters,2003(4):330-331. |
[14] | T. Umebayashi;T. Yamaki;H. Itoh;K. Asai .Band gap narrowing of titanium dioxide by sulfur doping[J].Applied physics letters,2002(3):454-456. |
[15] | Chi-Hwan Han;Sang-Do Han;Ishwar Singh;Thierry Toupance .Micro-bead of nano-crystalline F-doped SnO_2 as a sensitive hydrogen gas sensor[J].Sensors and Actuators, B. Chemical,2005(2):264-269. |
[16] | 周武艺,曹庆云,唐绍裘,罗颖.硫掺杂对纳米TiO2的结构相变及可见光催化活性的影响[J].中国有色金属学报,2006(07):1233-1238. |
[17] | Nyquist R A;Kagel R O.Infrared spectra of inorganic compounds (3800-45cm-1)[M].Academic Press,Inc,1971 |
[18] | Ohno T;Akiyoshi M;Umebayashi T et al.Preparation of S-doped TiO2 photocatalysts and their photocatalytic ac-tivities under visible light[J].Applied Catalysis A:General,2005,265:115-121. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%