Metal oxides and metal salt nanostructures for hydrogen sulfide sensing: mechanism and sensing performance

Abstract

Metal oxides and metal salt nanostructures for hydrogen sulfide sensing based on conductivity response.

CuO-Decorated ZnO Hierarchical Nanostructures as Efficient and Established Sensing Materials for H2S Gas Sensors

“…It mainly originates from the anaerobic digestion process due to the bacterial breakdown of organic compounds in the absence of oxygen gas such as in a swamp and in sewers. It occurs naturally in certain food, natural gas, and crude petroleum and also as industrial byproducts12. H 2 S is one of the most toxic gases and poses a health risk at high concentrations as apart from its unpleasant smell even at relatively low concentration3.…”

Fabrication of Lettuce-Like ZnO Gas Sensor with Enhanced H2S Gas Sensitivity

“…(2) even low concentrations of H 2 S can affect the human visual system, respiratory system, and central nervous system [6][7][8]; (3) based on previous reports, the short-term (10 minutes) and long-term (eight hours) exposure limits for humans in a H 2 S atmosphere are 15 ppm and 10 ppm [9], respectively; and (4) at the same time, under aerobic and hot and humid conditions, H 2 S sulfur-containing gas will have a strong corrosive effect on various metal pipelines, and may also cause catalyst deactivation, which may cause energy or efficiency loss [10]. In addition, H 2 S is an atmospheric pollutant and an important source of acid rain [11]. The development of high-performance H 2 S gas sensors has become an urgent need.…”

H2S Sensing by Hybrids Based on Nanocrystalline SnO2 Functionalized with Cu(II) Organometallic Complexes: The Role of the Ligand Platform

“…These hybrid materials can be considered as a model system in which the central ion provides selectivity in H 2 S detection, and the choice of an organic ligand allows for varying the magnitude of the signal. Surface modification of n -type SnO 2 with p -type CuO is a well-known method for the selective increase of SnO 2 sensitivity to H 2 S [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. The selectivity mechanism for the CuO/SnO 2 system was first proposed in the earliest works of Yamazoe and co-workers [ 8 ] and confirmed for materials obtained in different forms: ceramics and thick films [ 11 , 15 , 22 ], thin films [ 9 , 12 , 13 , 16 ], planar thin film heterostructures [ 10 , 23 ], and 1D nanostructures [ 14 , 17 , 18 , 19 , 20 , 21 ].…”