Dip-coating decoration of Ag₂O nanoparticles on SnO₂ nanowires for high-performance H₂S gas sensors

Abstract

Ag2O nanoparticles decorated on the surface of on-chip growth SnO2 nanowires by a dip-coating method possessed excellent sensing performance for H2S gas.

The gas-sensing performance of a core–shell SnO2-based chemiresistive MEMS sensor for H2S detection under vacuum

“…Ag 2 O, a p-type narrow band-gap semiconductor (1.3 eV) with a work function of 5.0 eV, was decorated on SnO 2 NPs, forming n–p–n junctions. 26 It is worth noting that the high conductivity of Ag 2 S, comparable to that of a conductor, can result in a significant reduction in resistance when a pure Ag 2 O gas sensor directly detects H 2 S gas at varying concentrations. This hindered electron current, aggravating the SnO 2 conductivity decline.…”

Enhanced acetone gas-sensing characteristics of Pd–NiO nanorods/SnO2 nanowires sensors

“…The growth process was maintained for 15 min; (4) aer nishing the growth process of SnO 2 nanowires the furnace was cooled down naturally to room temperature. 13,15,18,36…”

“…5,9 For n-type semiconductors, SnO 2 nanowires are currently the most widely used material for detecting of various gases thanks to its advanced characteristics and low cost. 9 SnO 2 can sense to many gases or vapors at moderate temperatures [10][11][12][13][14][15][16][17][18][19] because it has a high reactivity caused by the natural non-stoichiometry. 10,11,14 Surface chemical reactions determine the gas-sensing properties; hence, an increasing number of studies focus on surface decoration to boost sensor sensitivity.…”

Hydrothermal Synthesis of SnO2 with Different Morphologies as Sensing Materials for HCHO Detection

“…As the concentration increases, the compound generates a strong, irritating smell and is volatile and toxic to humans and other animals. 1,2 According to the World Health Organization (WHO) guidelines, we will feel nausea and dizziness upon long-term exposure to the HCHO gas. 3,4 Therefore, it is necessary to install a formaldehyde gas sensor in the environment.…”

“…Formaldehyde (HCHO) is a colorless hazardous gas and is not easily detectable at low concentrations. As the concentration increases, the compound generates a strong, irritating smell and is volatile and toxic to humans and other animals. , According to the World Health Organization (WHO) guidelines, we will feel nausea and dizziness upon long-term exposure to the HCHO gas. , Therefore, it is necessary to install a formaldehyde gas sensor in the environment. Now metal oxide-semiconductor (MOS) gas sensors have been used to detect harmful gases because of their low consumption, better long-term stability, and high response …”