Abstract
alpha-MnO2 nanoparticles were hydrothermally synthesized and characterized for their various physicochemical properties using different techniques. The average diameter of the nanoparticles was observed to be 70 +/- 5 nm along with well-resolved inter-planar spacing of 0.241 nm corresponding to (211) plane for alpha-MnO2 crystal phase. Working electrode for ethanol gas sensing fabricated by using alpha-MnO2 nanoparticles showed gas response of 30.6 at optimized temperature of 300 degrees C. The corresponding response and recovery times were 30 s and 40 s, respectively for 200 ppm ethanol at 300 degrees C. (C) 2020 Elsevier B.V. All rights reserved.