A novel and sensitive formaldehyde gas sensor utilizing thermal desorption coupled with cataluminescence

作者：Li Shaofang; Li Fengping; Rao Zhiming^*

来源：Sensors and Actuators B: Chemical , 2010, 145(1): 78-83.

DOI：10.1016/j.snb.2009.11.021

• Formaldehyde
• TD/CTL
• Gas sensor
• TiO(2)-Y(2)O(3)

A highly sensitive gas sensor based on thermal desorption coupled with cataluminescence (TD/CTL) using TiO(2)-Y(2)O(3) (mass ratio 1:3) as a probe was firstly proposed for the determination of formaldehyde in air. Quantitative analysis was performed at an optimal adsorbent of active carbon, thermal desorption temperature of 140 degrees C, catalytic temperature of 195 degrees C, a wavelength of 490 nm and a flow rate of 280 mL/min. The linear range of CTL intensity versus concentration of formaldehyde was 0.026-1.30 mg/m(3) (r=0.9990, n = 7), and the detection limit (3 sigma) was 0.01 mg/m(3). There was no or weak response to foreign substances, such as benzene, ethanol, chloroform, carbon tetrachloride, toluene, dimethylbenzene and n-hexane. This proposed formaldehyde gas sensor showed the high sensitivity, rapid response, good stability, and allowed on-line monitoring of formaldehyde in air.

• 出版日期2010-3-4
• 单位闽南师范大学