CO Sensing Properties of TiO2 Based on the p-n Transition Induced by Carbon Monoxide at High Temperatures

doi:10.3724/SP.J.1077.2012.00458

Abstract

Abstract:

Rutile TiO₂ based semiconductor-type sensors were investigated for sensing CO within the temperature range from 600℃ to 800℃. The sensor showed p-type behavior to CO (20-2000 mg/m³) when tested in oxygen concentrations varied from 10% to 2% between 600℃ and 700℃. The response of the sensor decreased significantly as the temperature increased from 600℃ to 700℃ approaching to one. However, when the temperature was above 750℃, an n-type behavior of the sensor to CO was observed. This n-type response further increased when the temperature increased to 800℃. AC impedance was employed to study the conduction behaviors of the TiO₂ thick film in both varied oxygen concentrations and CO environment at 800℃. The results indicate that the change of the oxygen ion/vacancy concentrations in the bulk TiO₂ is probably the reason for the p-n conduction transition induced by CO.

Key words: TiO₂, p-n conduction transition, high temperature CO sensors, impedance spectrum

CLC Number:

TQ174

ZHANG Jian-Wei, SUN Fang-Jie, LI Xiao-Gan, YU Jun, WANG Jing, YAN Wei-Ping, TANG Zhen-An. CO Sensing Properties of TiO₂ Based on the p-n Transition Induced by Carbon Monoxide at High Temperatures[J]. Journal of Inorganic Materials, 2012, 27(5): 458-462.

Figures/Tables 6

Fig. 1 (a) XRD pattern and (b) SEM image of the surface of the TiO2 thick film

Fig. 2 (a) Sensitivity of TiO2 sensor to CO at different temperatures from 600℃ to 800℃; (b) p-n conduction transition observed at 745℃

Fig. 3 Two probe DC resistance of TiO2 thick film in various gas environments

Table 1 Comparison of resistances of the TiO2 thick film obtained by using the two-probe DC method and AC impedance in various gas environments

Resistance/ (×10⁵, Ω)	O₂or CO
Resistance/ (×10⁵, Ω)	25%	12.5%	5%	1832 mg/cm³CO in 5%O₂
R_dc	3.91	4.11	4.30	2.28
R_ac	3.43	3.59	3.89	2.36
R_dc-R_ac	0.48	0.52	0.41	-0.08

Fig. 4 AC impedance spectra of the TiO2 thick film in various gas environments

Fig. 5 Response curve of the TiO2 sensor to CO in different oxygen concentrations at 800℃

References 17

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CO Sensing Properties of TiO₂ Based on the p-n Transition Induced by Carbon Monoxide at High Temperatures

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