A review on resistive-based gas sensors for the detection of volatile organic compounds using metal-oxide nanostructures

John, Riya Alice B.; Kumar, A. Ruban

doi:10.1016/j.inoche.2021.108893

Cited by 78 publications

(32 citation statements)

References 245 publications

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“…A large number of experimental and theoretical studies have shown that Co 3+ species are the active site of Co 3 O 4 in the catalytic oxidation reaction, , while Co 2+ species are generally inert. Meanwhile, O ads species are generally considered to be the key species involved in the MOS gas sensing reaction. , The difference of surface atomic structure between two crystal facets of Co 3 O 4 is an important reason for the difference in their gas sensing performance. The surface element composition and chemical state of Co 3 O 4 /rGO heterostructures were also studied (Figure S8).…”

Section: Resultsmentioning

confidence: 99%

“…Exposure to VOCs above a certain concentration can cause headaches, fatigue, vomiting, and even death. Effective detection and monitoring of VOCs are becoming increasingly urgent. − Because of the advantages of low cost, stable performance, and simple equipment, metal oxide semiconductor (MOS) gas sensors have shown broad application prospects in the detection of VOCs. − However, MOS sensors still have the problems of high operating temperature and poor selectivity. Because gas sensing reactions of MOS are essentially surface reactions that involve the absorption/desorption of target gas molecules on the surface of MOS and subsequent charge transfer at the interface, surface and interface structures are key factors that affect the gas sensing performances of MOS.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Gas Sensing Performance of rGO Wrapped Crystal Facet-Controlled Co₃O₄ Nanocomposite Heterostructures

Chen

et al. 2022

J. Phys. Chem. C

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Crystal facet engineering and graphene modification are both effective means to improve the gas sensing performance of metal oxide semiconductors (MOSs) currently. However, research on the crystal facet effect and synergistic effect of graphene modification of p-type MOS sensors is relatively lacking. Here, ptype Co 3 O 4 nanocrystals with controlled crystal facets ({112} and {100}) were in situ wrapped in the two-dimensional (2D) nanosheet network of graphene. It was found that bare {112} facets showed a significantly higher triethylamine sensing performance than {100} facets, implying a strong crystal facet effect. Interestingly, the triethylamine sensing performance of {112} facets was significantly improved after rGO modification, while the performance improvement of Co 3 O 4 {100} was limited after rGO modification. Further study suggested that {112} facets contained more active Co 3+ species and chemically adsorbed oxygen species than {100} facets, which promoted the adsorption of triethylamine and the subsequent sensing reaction. In addition, the strong electronic interaction between Co 3 O 4 {112} crystal facets and rGO promoted efficient charge exchange through the heterogeneous interface. This work provides a new way to improve the gas sensing performance of Co 3 O 4 through the synergistic effect of crystal facet engineering and graphene modification.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Gas Sensing Performance of rGO Wrapped Crystal Facet-Controlled Co₃O₄ Nanocomposite Heterostructures

Chen

et al. 2022

J. Phys. Chem. C

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“…Metal oxide nanomaterials were used in gas sensing for the detection of various explosive and toxic gases such as (ethanol, toluene, formaldehyde, CH 4 , CO, NO 2 , O 3 , H 2 S, etc.) [ 15 , 16 ]. Sensors based on (Pd, Fe)-modified SnO 2 and Pt-loaded SnO 2 showed better selectivity towards CO and H 2 , respectively, when exposed to a mixture of the two gases [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

A Micropowered Chemoresistive Sensor Based on a Thin Alumina Nanoporous Membrane and SnxBikMoyOz Nanocomposite

Gorokh

Zakhlebayeva

Таратын

et al. 2022

Sensors

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This work presents and discusses the design of an efficient gas sensor, as well as the technological process of its fabrication. The optimal dimensions of the different sensor elements including their deformation were determined considering the geometric modeling and the calculated moduli of the elasticity and thermal conductivity coefficients. Multicomponent SnxBikMoyOz thin films were prepared by ionic layering on an anodic alumina membrane and were used as gas-sensitive layers in the sensor design. The resistance of the SnxBikMoyOz nanostructured film at temperatures up to 150 °C exceeded 106 Ohm but decreased to 104 Ohm at 550 °C in air. The sensitivity of the SnxBikMoyOz composite to concentrations of 5 and 40 ppm H2 at 250 °C (10 mW) was determined to be 0.22 and 0.40, respectively.

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“…7 In this regard, resistive sensors are advantageous because of their small footprint and compatibility with silicon technology. 8 Microresistive sensors contain nanomaterial-based sensing layers because of their large surface-to-volume ratios. Among various materials that are used to fabricate the sensing layer, two essential classes of sensing materials are (i) twodimensional (2D) layered materials (e.g., reduced graphene oxide, 9 MoS 2 , 10 and 2D TMOs) and (ii) bulk/nano metal oxides (like SnO 2 , 11 WO 3 , 12 NiO, 13 and ZnO 14 ).…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, they have a limited operating temperature range, involve significant hysteresis losses, use electrolytes, and have a shorter shelf life . In this regard, resistive sensors are advantageous because of their small footprint and compatibility with silicon technology . Microresistive sensors contain nanomaterial-based sensing layers because of their large surface-to-volume ratios.…”

Section: Introductionmentioning

confidence: 99%

Adsorption-Mediated n-Type ZnO Surface Reconstruction for Optically Enhanced Volatile Organic Compound Sensing

Nag

Dey

Das

et al. 2022

ACS Appl. Electron. Mater.

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Specific volatile organic compounds (VOCs), abundant in indoor air, go unestimated due to the unavailability of specific detectors. Here, we have demonstrated n-type ZnO nanoforest thin films as highly sensitive toluene and 2-propanol sensors at reduced temperatures (∼150 °C) under optical irradiation. The sensors demonstrated a maximum response of 2273% for 2-propanol and 1579% for toluene at 190 ppm each, with the response and recovery times of 46 and 36 s for toluene and 42 and 37 s for 2-propanol, respectively, which were significantly high in comparison to those in the dark (312 and 438% for toluene and 2-propanol, respectively, at 190 ppm at 300 °C) with excellent reproducibility and device stability (tested for 70 days). The optical enhancement was due to a significant number of photogenerated carriers in the conduction band contributing to the sensing. The sensor was highly specific toward toluene and 2-propanol compared to other vapors. Principal component analysis was performed on the acquired transient responses to determine a clear specificity among the two overlapping VOCs. The device degraded under humidity, as explained by the competitive binding interaction of water with analytes. The marginally higher response of 2-propanol compared to toluene was due to a higher binding coefficient for 2-propanol. To demonstrate the sensing performance, an adsorption-mediated surface reconstruction mechanism was suggested, which showed a higher degree of dissociation for 2-propanol onto the ZnO(101) surface, thereby creating more dissociative adsorption states favorable for its adsorption (evident from the reduced adsorption energy). This resulted in enhanced sensing of 2-propanol over toluene, thereby supporting the experimental sensing variation. Thus, unlike its commercial competitors, the fabricated sensor can selectively detect individual VOCs.

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A review on resistive-based gas sensors for the detection of volatile organic compounds using metal-oxide nanostructures

Cited by 78 publications

References 245 publications

Enhanced Gas Sensing Performance of rGO Wrapped Crystal Facet-Controlled Co₃O₄ Nanocomposite Heterostructures

Enhanced Gas Sensing Performance of rGO Wrapped Crystal Facet-Controlled Co₃O₄ Nanocomposite Heterostructures

A Micropowered Chemoresistive Sensor Based on a Thin Alumina Nanoporous Membrane and SnxBikMoyOz Nanocomposite

Adsorption-Mediated n-Type ZnO Surface Reconstruction for Optically Enhanced Volatile Organic Compound Sensing

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A review on resistive-based gas sensors for the detection of volatile organic compounds using metal-oxide nanostructures

Cited by 78 publications

References 245 publications

Enhanced Gas Sensing Performance of rGO Wrapped Crystal Facet-Controlled Co3O4 Nanocomposite Heterostructures

Enhanced Gas Sensing Performance of rGO Wrapped Crystal Facet-Controlled Co3O4 Nanocomposite Heterostructures

A Micropowered Chemoresistive Sensor Based on a Thin Alumina Nanoporous Membrane and SnxBikMoyOz Nanocomposite

Adsorption-Mediated n-Type ZnO Surface Reconstruction for Optically Enhanced Volatile Organic Compound Sensing

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Enhanced Gas Sensing Performance of rGO Wrapped Crystal Facet-Controlled Co₃O₄ Nanocomposite Heterostructures

Enhanced Gas Sensing Performance of rGO Wrapped Crystal Facet-Controlled Co₃O₄ Nanocomposite Heterostructures