A computational study of a\xa0chemical gas sensor\xa0utilizing Pd\u2013rGO composite\xa0on\xa0SnO2 thin\xa0film\xa0for the detection of NOx

S Akshya,A Vimala Juliet

doi:10.1038/s41598-020-78586-7

Abstract

In this paper we discussed, nitrogen oxides gas sensors are designed and simulated using the MEMS-based tool of COMSOL Multiphysics software. Pd–rGO composite films were designed and their NOx sensing characteristics were investigated in this study by comparing with/without active layers. Transition metal SnO2 deals with four different active materials i.e., Pure SnO2, SnO2–Pd, SnO2–rGO, and SnO2–Pd/rGO film was controlled by altering the active materials during the active layer deposition. The deposition of Pd/rGO active material is integrated into the SnO2 thin film. The response of the nanocomposite materials on the NOx gas sensor at a low temperature below 100 °C was significantly improved. Moreover, we investigate the optimization from different active layer response for NOx by applying power in watt and milliwatt to the interdigitated electrode on the Sn substrate. The determination is tense to finalize the suitable materials that to detect more response for nitrogen oxides i.e., Pd/rGO layer shows better performance when compared with other active layers for the sensing of nitrogen oxides is in proportion to the power in the range of 0.6–4.8 W at (1–8) Voltage range. This advanced research will enable a new class of portable NOx gas sensors to be constructed with millimeter size and microwatt power.

Highlights

Chemical gas sensors hinge on oxide matters are among the majority of shapes for the modelling of sensors
A S nO2 thin film provides an effective material for NOx gas sensing incorporating with actives layers and the tin dioxide film for reduction of power consumption, low to 0.6–4.8 W when the active layers of the sensor are interacting with nitrogen and oxygen gas molecules at particular temperature
Chemical gas sensor sensible enthalpy is obtained by measuring the changes in sensitivity when a load is applied to the chemical gas sensor with respect to temperature

Summary

Introduction

Chemical gas sensors hinge on oxide matters are among the majority of shapes for the modelling of sensors. Electrical potential, current sensing have been observed based on nitrogen oxides molecules adsorbed on the surface of gas sensor and electrons mobility. The chemical gas sensors based tin oxide thin films and deposited with/without active materials of palladium, reduced graphene oxide were deposited by a newly developed technique.

Results

Conclusion