Experimental Validation of the Importance of Thermally Stable Bulk Reduction States in TiO2 for Gas Sensor Applications

doi:10.6023/A12030002

Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (13): 1477-1482.DOI: 10.6023/A12030002 Previous Articles Next Articles

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热稳定体相还原态对二氧化钛气敏应用重要性的实验证实

邹晓新^a,b, 李国栋^b, 邹永存^b, 王培培^b, 苏娟^a,b, 赵君^b, 王宇宁^b, 陈接胜^a

a 上海交通大学化学化工学院上海 200240;
b 吉林大学无机合成与制备化学国家重点实验室长春 130012

投稿日期:2012-02-28 发布日期:2012-03-30
通讯作者: 陈接胜 E-mail:chemcj@sjtu.edu.cn
基金资助:
项目受国家自然科学基金(No. 91022019)和国家重点基础研究计划(No. 2011CB808703)资助.

Experimental Validation of the Importance of Thermally Stable Bulk Reduction States in TiO₂ for Gas Sensor Applications

Zou Xiaoxin^a,b, Li Guodong^b, Zou Yongcun^b, Wang Peipei^b, Su Juan^a,b, Zhao Jun^b, Wang Yuning^b, Chen Jiesheng^a

a School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
b State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China

Received:2012-02-28 Published:2012-03-30
Supported by:
Project supported by the National Natural Science Foundation of China (91022019) and the National Basic Research Program of China (2011CB808703).

The relationship between bulk-reduction states and gas-sensing properties of TiO₂ was predicted previously, but has not been validated yet experimentally. Herein, we present a chemical approach for the preparation of TiO₂ nanoparticles with thermally stable bulk reduction states using porous amorphous titania as precursor. UV/vis diffuse reflectance, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) confirm that the stable bulk reduction states are the thermally stable Ti³⁺ ions and electron-trapped oxygen vacancies. O₂-temperature programmed desorption (O₂-TPD) measurements demonstrate that the presence of the bulk reduction states can obviously enhance the oxygen adsorption on titania surfaces. Furthermore, the bulk-reduced nanomaterial exhibits not only enhanced sensitivity and ultrafast response/ recovery (＜3 s) for the detection of organic vapors (ethanol, methanol and acetone), but also excellent selectivity to CO against CH₄ and H₂. The sensing performance testing results confirm the importance of bulk reduction states in TiO₂ sensors for the first time, and the enhanced gas-sensing performances for bulk-reduced TiO₂ materials can be related to the enhanced oxygen absorption on TiO₂ surfaces.

Key words: titanium dioxide, gas sensor, bulk reduction states, oxygen adsorption, nanomaterial

Cite this article

Zou Xiaoxin, Li Guodong, Zou Yongcun, Wang Peipei, Su Juan, Zhao Jun, Wang Yuning, Chen Jiesheng. Experimental Validation of the Importance of Thermally Stable Bulk Reduction States in TiO₂ for Gas Sensor Applications[J]. Acta Chimica Sinica, 2012, 70(13): 1477-1482.

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热稳定体相还原态对二氧化钛气敏应用重要性的实验证实

Experimental Validation of the Importance of Thermally Stable Bulk Reduction States in TiO₂ for Gas Sensor Applications

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