Enhanced H2S gas sensing properties of Mn doped ZnO nanoparticles—an impedance spectroscopic investigation
Abstract
H2S is a toxic gas and causes wide range of health issues by breathing it. Thus, detection of H2S in ppm level with suitable device is very important. Undoped and Mn doped ZnO NPs were synthesised using sol-gel technique and spin coated on alumina substrate to form as a thin film for gas sensing applications. The sensor response was evaluated by the change in an impedance of the film in the absence and presence of H2S gas. The impedance results revealed that the 4% Mn doped ZnO nanoparticles are found to be enhanced sensitivity and selectivity towards H2S than Undoped ZnO nanoparticles and other Mn doped nanoparticles. Response and recovery towards 5 ppm H2S at 150 °C operating temperature is observed for the 4 wt% Mn doped ZnO nanoparticles are ∼22 s and 19 s respectively. Meanwhile 4% Mn doped ZnO showed good selectivity towards H2S against common interfering gases.
- Publication:
-
Materials Research Express
- Pub Date:
- July 2019
- DOI:
- 10.1088/2053-1591/ab0eef
- Bibcode:
- 2019MRE.....6g5009S
- Keywords:
-
- ZnO-Mn2+ ion;
- nanomaterials;
- photoluminescence;
- H2S gas sensor;
- impedance spectroscopy