Sn-doped Zinc Oxide Thin Films for Methanol

Sensors & Transducers

Rajarshi Krishna NATH¹  Siddhartha Sankar NATH¹ 

[1] Department of Physics, Assam University Silchar, Silchar-788018, Assam, India;

关键词: ZnO:Sn;    Thin film;    Spray pyrolysis;    Methanol vapour;   

DOI  :  

来源: DOAJ

【 摘 要 】

Sn doped zinc oxide (ZnO:Sn) thin films have been prepared by chemical spray pyrolysis technique with dopant concentration (Sn/Zn at %) from 0 to 1.5 at %. The structural, morphological, optical and electrical properties of the films are explored and then tested for methanol sensing. The resistivity of the films decreases with Sn doping up to 0.5 at %, while at higher doping concentration the disorder produced in the lattice causes an increase in resistivity of the films. Exposure of methanol decreases the resistance of the films. The response of the film is measured for both ZnO and ZnO:Sn films at different operating temperature (200-350 0C) and concentration (ppm) of methanol in air. It is observed that ZnO:Sn films are more sensitive to methanol than undoped ZnO film. The maximum response (~53 %) is observed for 0.5at % ZnO:Sn film to 500 ppm of methanol in air at 300 0C. Further the films have shown faster response and recovery times at higher operating temperatures.

【 授权许可】

Unknown