AC MEASUREMENTS ON TIN OXIDE SENSORS TO IMPROVE SELECTIVITIES AND SENSITIVITIES

被引：138

作者：

WEIMAR, U ^{[1
]}

GOPEL, W ^{[1
]}

机构：

[1] UNIV TUBINGEN,CTR INTERFACE ANAL & SENSORS,D-72076 TUBINGEN,GERMANY

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 1995年 / 26卷 / 1-3期

关键词：

TIN OXIDE; 2-; 3-; 4-PROBE CURRENT-VOLTAGE MEASUREMENTS (D.C.); AC MEASUREMENTS; CONDUCTANCE; IMPEDANCE; GAS SENSOR;

D O I：

10.1016/0925-4005(94)01547-U

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In the experimental section of this paper different d.c. and a.c, setups are described to measure and characterize the conduction properties in SnO2 as a typical semiconducting oxide gas sensor. The use of different contact arrangements and monitoring at different frequencies make it possible to discriminate between different contributions to the overall conduction in SnO2. These include electronic contributions from contacts, surfaces, grain boundaries and the bulk as well as ionic contributions from adsorbed gas species. The electrical characterization makes it possible to describe them by means of a band scheme and equivalent circuits, Finally, specific results are reported to monitor CO, NO2 and H-2. These illustrate that the selectivity and sensitivity to monitor different gases can be improved significantly in frequency-dependent measurements.

引用

页码：13 / 18

页数：6

共 15 条

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[7] Schierbaum K.D., Kirner U., Geiger J., Gopel W., Schottky-barrier and conductivity gas sensors based upon Pd/SnO2 and Pt/TiO2, Sensors and Actuators B, 4, pp. 87-94, (1991)
[8] Schierbaum K.D., Weimar U., Gopel W., Technologies of SnO2-based chemical sensors: comparison between polycrystalline, thin film, and thick film structures, Conf. Proc. Sensor '91, Nürnberg, Germany, 4, pp. 123-138, (1991)
[9] Schierbaum K.D., Weimar U., Gopel W., Comparison of ceramic, thick film, and thin film chemical sensors based upon SnO2, Sensors and Actuators B, 7, pp. 709-716, (1992)
[10] Schierbaum K.D., Geiger J., Weimar U., Gopel W., Specific palladium and platinum doping for SnO2-based thin film sensor arrays, Sensors and Actuators B, 13-14, pp. 143-147, (1993)

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