Use of CNT/Co3O4-SnO2 in a Carbon Monoxide Sensor Operatingat Room Temperatures
Sensing materials of Co3O4-SnO2 system were prepared hydrothermal method. The prepared samples were characterized using temperature program reduction (TPR) technique. The resulting Co3O4-SnO2 material was used as a semiconductor p-type CO sensor. The mixture with a Co3O4-SnO2 ratio of 1:4 had the highest sensor response among various ratios of Co3O4-SnO2 at the working temperature. Various metals Au, Ag, Au and Pt were adding on the surface of Co3O4-SnO2 revealed no enhancement of the sensor response of the sensor. Doping 0.1% CNT into Co3O4-SnO2 enhanced the CO response of undoped Co3O4-SnO2. Addition of CNT increased the adsorption ability of the blended material and enhanced the sensor response. The sensor response was tested under CO concentrations ranging from 20 to 1000 ppm.
Keywords: CNT/CO3O4-SNO2; CO SENSOR; SENSOR RESPONSE; TPR
Document Type: Research Article
Publication date: 01 December 2008
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