CuxO Nanostructure-Based Gas Sensors for H2S Detection: An Overview

Abstract

H2S gas is a toxic and hazardous byproduct of the oil and gas industries. It paralyzes the olfactory nerves, with concentrations above 100 ppm, resulting in loss of smell; prolonged inhalation may even cause death. One of the most important semiconducting metal oxides for the detection of H2S is CuxO (x = 1, 2), which is converted to CuxS upon exposure to H2S, leading to a remarkable modulation in the resistance and appearance of an electrical sensing signal. In this review, various morphologies of CuxO in the pristine form, composites of CuxO with other materials, and decoration/doping of noble metals on CuxO nanostructures for the reliable detection of H2S gas are thoroughly discussed. With an emphasis to the detection mechanism of CuxO-based gas sensors, this review presents findings that are of considerable value as a reference.

Delafossite CuGaO2-Based Chemiresistive Sensor for Sensitive and Selective Detection of Dimethyl Disulfide

“…27−29 Previous studies indicate copper-based materials such as CuO, CuAlO 2 , and CuCrO 2 show excellent selectivity to H 2 S (a highly reactive VSCs gas) due to the sulfuration of the weak covalent Cu−O bond. 20,21,30 CuGaO 2 shows similar structural and electrical properties with those of CuAlO 2 and CuCrO 2 , which inspires us to investigate the VSCs sensing characteristics of CuGaO 2 . Herein, hexagonal-platelet p-type CuGaO 2 nanoparticles, synthesized by a hydrothermal method, have been proposed as a novel material for DMDS monitoring.…”

“…As a member of the delafossite CuMO 2 compound family, CuGaO 2 exhibits a layered structure alternately stacked with one layer as the close-packed monovalent Cu atoms and the other as edge-shared Ga III O 6 octahedra . CuGaO 2 is a promising photocatalyst, due to suitable band edges, high carrier mobility, and exceptional long-term stability. − Previous studies indicate copper-based materials such as CuO, CuAlO 2 , and CuCrO 2 show excellent selectivity to H 2 S (a highly reactive VSCs gas) due to the sulfuration of the weak covalent Cu–O bond. ,, CuGaO 2 shows similar structural and electrical properties with those of CuAlO 2 and CuCrO 2 , which inspires us to investigate the VSCs sensing characteristics of CuGaO 2 . Herein, hexagonal-platelet p-type CuGaO 2 nanoparticles, synthesized by a hydrothermal method, have been proposed as a novel material for DMDS monitoring.…”

Achieving One Part Per Billion Hydrogen Sulfide (H2S) Level Detection through Optimizing Composition and Crystallinity of Gold-Decorated Tungsten Trioxide (Au-WO3) Nanofibers

“…Hydrogen sulfide (H 2 S) is a colorless gas distinguished by its “rotten egg” odor. Its corrosive, flammable, and explosive properties signify substantial risks that underscore the imperative for meticulous management and secure storage to ensure safety . Low level exposure of H 2 S may lead to eye or throat irradiation, memory impairment, and dizziness, etc .…”

“…Its corrosive, flammable, and explosive properties signify substantial risks that underscore the imperative for meticulous management and secure storage to ensure safety. 1 Low level exposure of H 2 S may lead to eye or throat irradiation, memory impairment, and dizziness, etc. 2 The United States Occupational Safety and Health Administration (US-OSHA) states that the personal exposure limit to H 2 S is 20 ppm within 8 h. 3 Continuous exposure to 100 ppb of H 2 S can also have adverse effects on human cellular respiration, leading to diminished oxygen levels in systemic tissues.…”

Effect of Au Doping on ZnO Nanoporous Structure for H2S Gas Sensing

“…3 H 2 S gas is produced in various forms such as volcanic eruptions, paper mills, petroleum refining, natural gas and sewage systems. 4 Construction waste landfills decomposes organic materials which contains sulfate ions, which in turn converts to H 2 S gas, causing a major requirement for H 2 S gas detection. 5 While the exposure limit for H 2 S is set to 10 min minimum time and 8 h maximum time, human nose can sense H 2 S gas at more than 15 ppm concentration but long time exposure may lead to desensitization.…”