UV light activation of TiO2 for sensing formaldehyde: How to be sensitive, recovering fast, and humidity less sensitive

Abstract Using a novel platform with the ability of high throughput resistance measurement (HT-RM), the responses of UV light activated TiO 2 for formaldehyde sensing were studied. A way to let TiO 2 be sensitive, recovering fast, and humidity less sensitive for formaldehyde sensing under UV light activation by moderate temperature heating was proposed. The performance of TiO 2 for formaldehyde sensing under different humidity was also presented. The results showed that, 60 °C was the optimum sensing temperature to show high gas responses and low humidity dependence of sensor resistance. The concentration–resistance calibration curves to formaldehyde was established at working temperature of 60 °C. The concentration of formaldehyde could be detected under 0.1 ppm with the C–R calibration curves. 30 repeat measurements of 100 ppm formaldehyde measured under humidity of 18.24 mg/L at working temperature of 60 °C showed stable responses. The results in this paper present a promising way to use light activated TiO 2 as a gas sensing material with high performances.

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