Carbon monoxide gas sensing using zinc oxide film deposited by spray pyrolysis

7th International Conference on Key Engineering Materials

材料科学;工业技术

Leano, J.M.G.^1 ; Villapando, J.M.L.A.^1 ; Balaaldia, A.E.^1 ; Gianan, G.^2 ; Manalo, F.K.B.^1 ; Florido, E.A.^2

San Pablo City Science High School, San Pablo City, Philippines^1

Institute of Mathematical Sciences and Physics, University of the Philippines Los Banos, Laguna

4031, Philippines^2

关键词: Current-voltage relationship;    Electrical characterization;    Gas concentration;    Linear relationships;    Parts per millions;    Precursor solutions;    Sensor characteristics;    Zinc acetate precursor;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/201/1/012051/pdf
DOI  :  10.1088/1757-899X/201/1/012051

来源: IOP

【 摘 要 】

This study was aimed to determine the carbon monoxide (CO) gas sensing ability of zinc oxide (ZnO) film fabricated by spray pyrolysis on glass substrate heated at 3000C using 0.2 M zinc acetate precursor solution. The temperature of the precursor solution was maintained at room temperature. Carbon monoxide gas was synthesized by mixing the required amount of formic acid and excess sulfuric acid in the ratio of 1:6 to produce CO gas concentrations of 100, 200, 300, 400, and 500 parts per million (ppm) v/v. There were five trials for each concentration. The films produced exhibited good sensor characteristics such as high linearity in current voltage relationship and voltage response versus concentration. Electrical characterization using the four-point probe showed a linear relationship between current and voltage with resistivity of 0.49 ohm-cm and R2value of 0.994 The zinc oxide film exhibited a sensitivity of 0.19 Volt per 100 ppm of CO gas and linearity R2value of 0.993.