Room Temperature Chemiresistor H2S Gas Sensor based on ZnS/PbS Core-Shell Quantum Dots

Abstract

This paper investigates the response of chemiresistor gas sensor at room temperature with ZnS/PbS core-shell quantum dots as a gas-sensitive layer to detect hydrogen sulfide as a toxic gas, which is a product of decaying organic matter, refineries, and several industrial processes such as extracting crude oil. The dark current of the sensor is simulated and calculated by COMSOL Multiphysics software. The sensor's response to different concentrations of hydrogen sulfide gas and how it changes over time is measured experimentally. Finally, over 2 minutes, the sensor's response to 300 ppm of hydrogen sulfide gas was 2062, an excellent response in gas sensors against target gas.