Enhancing room-temperature gas sensing performance of metal oxide semiconductor chemiresistors through 400 nm UV photoexcitation

Sensors and Actuators Reports, Journal Year: 2024, Volume and Issue: 7, P. 100194 - 100194

Published: April 2, 2024

One of the most significant drawbacks metal oxide (MOS) based chemiresistive gas sensors is requirement high operating temperature (250-450°C), which results in power consumption and shorter lifetime. To develop room (21±2°C) MOS sensors, sensing performance different nanostructures (i.e., tin (IV) (SnO2) nanoparticles (NPs), indium (III) (In2O3) NPs, zinc (ZnO) tungsten trioxide (WO3) copper (CuO) nanotubes (NTs), (In90Sn10O3 (ITO)) NPs) were systematically investigated toward toxic industrial chemicals (TICs) nitrogen dioxide (NO2), ammonia (NH3), hydrogen sulfide (H2S), carbon monoxide (CO), sulfur (SO2) volatile organic compounds (VOCs) acetone (C3H6O), toluene (C6H5CH3), ethylbenzene (C6H5CH2CH3), p-xylene (C6H4(CH3)2)) presence absence 400 nm UV light illumination. Sensing enhancement through photoexcitation strongly dependent on target analytes. Under at 76.0mW/cm2 intensity, NO2 was readily achieved where SnO2 NPs exhibited highest sensor response (S = 474.4 10ppmm (parts per million by mass)) with good recovery followed ZnO > In2O3 ITO NPs. Meanwhile, indirect bandgap n-type WO3 showed limited under illumination, whereas p-type CuO NTs relatively response. The improvements compared to other might be attributed number photogeneration electrons, rapidly reacted adsorbed NO2− species enhance reaction kinetics. a unique aromatic (e.g., p-xylene) maximum sensitivity 36mW/cm2 irradiation. Changing intensity from 0.0 36.4mW/cm2, 15.4-fold 6.3-fold 25ppmm 100ppmm p-xylene, respectively. optical excitation has effect CO, SO2, toluene, acetone.

Language: Английский

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One-step green synthesis of Cu₂O/CuO@rGO composites for ppt level detection of NO₂ at room temperature

Journal of Materials Chemistry C, Journal Year: 2023, Volume and Issue: 11(38), P. 12999 - 13009

Published: Jan. 1, 2023

A ppt level NO 2 sensor with high sensitivity, selectivity and stability based on one-step room temperature green synthesized 550Cu O/CuO@rGO-5 composites.

Language: Английский

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Ti3C2Tx/MoO3 composite as an ultrasensitive and selective sensing material for a room-temperature nitrogen dioxide sensor

Applied Surface Science, Journal Year: 2024, Volume and Issue: 676, P. 161025 - 161025

Published: Aug. 22, 2024

Language: Английский

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Laser-induced graphene gas sensors for environmental monitoring

Frontiers in Chemistry, Journal Year: 2024, Volume and Issue: 12

Published: Oct. 31, 2024

is a foundational plant taxon in western North America and an important medicinal threatened by climate change. Low-cost fabrication of sensors critical for developing large-area sensor networks understanding monitoring range environmental conditions. However, the availability materials manufacturing processes still early stages, limiting capacity to develop cost-effective at large scale. In this study, we demonstrate low-cost flexible using laser-induced graphene (LIG); graphitic material synthesized 450-nm wavelength bench top laser patterned onto polyimide substrates. We effect intensity focus incident beam on morphology electrical properties material. Raman analyses LIG show defect-rich with crystallite size tens nanometers. This shows that high level disorder within structure, along porous nature provide good surface gas adsorption. The initial characterization has shown analyte response represented change resistance up 5% presence volatile organic compounds (VOCs) are emitted detected

Language: Английский

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Advanced application of polyacrylic acid in laser-induced graphene technology

Journal of Industrial and Engineering Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

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