Advances in functional guest materials for resistive gas sensors

Abstract

The introduction of functional guest materials is an effective way to improve the sensing performance of resistive gas sensors.

Enhanced CO2 Sensing by Oxygen Plasma-Treated Perovskite–Graphene Nanocomposites

“…Apart from humidity interference, selectivity is a well-known issue in resistive sensors, typically characterized by a lack of specificity toward gas compounds. 51 For instance, CsPbBr 3 NCs decorating graphene, without exposure to oxygen plasma, have been also employed for the detection of volatile organic compounds such as benzene and toluene. 52 These selectivity issues potentially prevent the effective implementation of resistive gas sensors in commercial devices.…”

Recent Advances of Graphene Quantum Dots in Chemiresistive Gas Sensors

“…The gas sensing mechanism of pure GQDs is usually attributed to adsorption and desorption of sensing species on the surface and edges of GQDs as donors or acceptors, resulting in changes in conductivity of GQDs [68,121]. The physical structures of a chemiresistor sensor are illustrated in Figure 6, where the changes in conductivity of sensing materials occur [131][132][133][134]. A tubular gas sensor consists of a ceramic tube, a Ni-Cr heater, gold signal electrodes, Pt wires, a sensing film, and a base.…”

The heterostructure topology of a chemiresistive sensor based on hexagonal BaTiO3 and 2D SnO for toluene detection

“…Usually, they do not show a high response towards the less reactive, stable, higher molecular weights, and aromatic gases. [35][36][37] The p-type MOSs can solve this problem because they act as excellent catalysts for oxidizing several reducing gases with negligible reactivity. 38,39 Thus, combined n-and p-type hybrid oxide semiconductor materials are favorable for expanding their application in gas sensing, which will have a significant impact in the gas sensing industry.…”