A computational study of a chemical gas sensor utilizing Pd–rGO composite on SnO2 thin film for the detection of NOx

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.

A toy model of a catalytic filter in series with a gas sensor

“…Generally, mathematical models of catalytically filtered gas sensors could be useful for screening catalysts, recognition elements for the sensor, operating temperatures, and residence times of gas in the filter. This is in line with recent efforts to computationally-design (non-filtered) gas sensors [48,[53][54][55].…”

Highly responsive and selective ppb-level NO2 gas sensor based on porous Pd-functionalized CuO/rGO at room temperature

“…20 Although a lot of studies of constructing highly-efficient NO 2 gas sensors were carried out on the composite applications of rGO-decorated MOS-based nanomaterials coupled with Pd catalysts, the working temperature and sensitivity of the reported gas sensor were entirely unsatisfactory. [21][22][23][24] Inspired by these, it is predicted that the Pd-functionalized CuO/rGO nanocomposite can efficiently enhance the properties of sensors for detecting NO 2 gas. Additionally, the hydrothermal method is a simple and effective route to prepare gas-sensing materials at low cost, and was used in our previous studies.…”

Effect of Defects on Optical, Electronic, and Interface Properties of NiO/SnO2 Heterostructures: Dual-Functional Solar Photocatalytic H2 Production and RhB Degradation

“…On the other hand, SnO 2 with excellent electrical conductivity and chemical stability suffers from a wide bandgap, poor sensitivity, and a long response time, making it impractical to operate alone for application in various fields. 14 In previous studies, heterojunction formation with foreign compounds such as noble metals was the most employed strategy for gas sensors to enhance SnO 2 performance. 15,16 In the current work, first, a big disadvantage of SnO 2 (H 2 O adsorption) was eliminated by NiO doping.…”