Metal oxide semiconductors for gas sensing

Abstract

The usage of the gas sensor has been increasing very rapidly in the industry and in daily life for various potential applications. In the recent years, metal oxide semiconductors (MOS) become the primary choice for designing highly sensitive, stable, and low‐cost real‐life applications‐based gas sensors due to their inherent physical and chemical properties. Researchers have proposed numerous sensing mechanisms to explain the functionality of MOS‐based gas sensors. In this review, we have comprehensively covered different sensing mechanisms used for MOS. We have also discussed different parameters affecting the sensitivity and selectivity of the gas sensors. Moreover, the different techniques used to enhance the gas sensing response of MOS‐based sensors are also extensively covered. And finally, we give our prospective on recent opportunities and challenges on the future applications of MOS‐based gas sensors.

Nanocomposites of ZnO Nanostructures and Reduced Graphene Oxide Nanosheets for NO2 Gas Sensing

“…After rGO modification, additional peaks of hydroxyl and carboxyl groups were observed in O 1s and C 1s spectra at 533.3 and 288.2 eV, respectively (Figure 4d,e). According to the Lerf−Klinowski model, the structure of GO comprises of two distinct regions, lightly functionalized predominantly sp 2 -hybridized carbon atoms and the highly oxygenated sp 3 -hybridized carbon atoms. According to this model, hydroxyl and epoxide groups decorate the basal plane of the sheet, while carboxylates are present on the edges.…”

“…Metal-oxide semiconductor (MOS)-based gas sensors have gained wide popularity over the years since their first development in 1960 by Seyama et al due to their broad spectrum of electronic, chemical, and physical properties that are highly sensitive to the chemical environment . Among them, ZnO is extensively investigated due to its wide band gap (3.37 eV), distinctive optical, electrical, and piezoelectric properties, diverse nanoscale morphologies, − high stability, and excellent biocompatibility . Nanostructures are particularly studied owing to their high specific surface area, miniaturized integration, tunable surface reactivity, better chemical stability, etc. , Despite the numerous advantages of MOS, poor selectivity, stability, and sluggish response kinetics hinder their practical benefits.…”

Printable metal oxide nanostructures based chemiresistive non-biological analyte sensors

“…For the non-biological analytes sensing characteristics of the different MOs can be presented, focusing on strategies such as metal doping (Au, Ag, Pd, Pt) [56,57], nanohybrid structure [58], nanocomposite [58], heterojunction composites (n-n, p-p, n-p) [59,60], defects in nanomaterials, and different morphologies [61] that are applied to enhance their sensing characteristics.…”

Fabrication of conifer-like TiSnO2 nanorods for sensing H2S gas at room temperature

“…Numerous literature reviews have been published regarding the use of metal oxide semiconductors (MOSs) for H 2 S gas sensing. [7][8][9][10][11] MOSs have emerged as the most widely employed materials for H 2 S gas detection due to their exceptional properties, including facile fabrication, compact size, lightweight, and cost-effectiveness. 12 Among MOSs, tin oxide (SnO 2 ) has garnered signicant attention and has been extensively investigated in various shapes and morphologies for H 2 S gas sensing applications.…”