Spray deposited pristine and Mo doped WO3 thin films for acetaldehyde gas sensing at room temperature

Ceramics International, Journal Year: 2023, Volume and Issue: 50(1), P. 969 - 976

Published: Oct. 19, 2023

Language: Английский

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Advanced NH₃ Detection by 1D Nanostructured La:ZnO Sensors with Novel Intrinsic p–n Shifting and Ultrahigh Baseline Stability

ACS Sensors, Journal Year: 2024, Volume and Issue: 9(2), P. 895 - 911

Published: Jan. 31, 2024

Due to its stability, transportability, and ability be produced using renewable energy sources, NH3 has become an attractive option for hydrogen production storage. Detecting is then essential, being a toxic flammable gas that can pose dangers if not properly monitored. ZnO chemiresistive sensors have shown great potential in real monitoring applications; yet, research development this area are ongoing due reported limitations, like baseline instabilities sensitivity environmental factors, including temperature, humidity, interferent gases. Herein, we suggest approach obtain with competitive performance based on semiconducting metal oxides. For purpose, one-dimensional nanostructured pure La-doped films were synthesized hydrothermally. Incorporating large rare earth ions, La, into the bulk lattice of challenging lead surface defects influential gas-sensing reactions. The experienced temperature-induced p–n shifting at about 100 °C, verified by Hall effect AC impedance measurements. doped sensor showed exceptional stepwise stability outstanding relatively low operating temperature (150 °C) sensing response 91 best (@ 50 ppm NH3) recorded tolerance water vapor up 70% RH. Alongside shifting, enhanced was discussed correlation La doping-triggered changes nanostructural surfacial properties films. We validated proposed technique producing similar performing multiple replicates ensure consistency reproducibility. also introduced fill factor concept field as new trustworthy parameter could improve assessment help rate deviation from ideality.

Language: Английский

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Nanofibers enabled advanced gas sensors: A review

Advanced Sensor and Energy Materials, Journal Year: 2024, Volume and Issue: 3(2), P. 100093 - 100093

Published: Feb. 24, 2024

The advancement of gas sensor technology over the past decades has led to remarkable progress and achievements in pollution control environmental protection. Compared with other sensing materials, electrospun nanofibers have attracted significant attention, which is mainly due their unique characteristics, including but not limited high surface area, easy structure design, facile facility setup, multifunctional properties, etc., making them outstanding candidates for potential applications this field. This review provides an overview sensors, concentrating on carbon monoxide, hydrogen, dioxide, hydrogen sulfide, ammonia, nitrogen oxides, oxygen, volatile organic compounds. It begins a brief introduction materials advantages along ongoing research. principles electrospinning are then discussed. Afterward, corresponding properties diverse sensors thoroughly reviewed. Finally, future vision regarding challenges perspectives area proposed. extensive comprehensive reference utilize advanced generate novel facilitating performance high-demand areas.

Language: Английский

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

ACS Sensors, Journal Year: 2024, Volume and Issue: 9(1), P. 292 - 304

Published: Jan. 12, 2024

As a common environmental pollutant and an important breath biomarker for several diseases, it is essential to develop hydrogen sulfide gas sensor with low-ppb level detection limit prevent harmful exposure allow early diagnoses of diseases in low-resource settings. Gold doped/decorated tungsten trioxide (Au-WO3) nanofibers various compositions crystallinities were synthesized optimize H2S-sensing performance. Systematically experimental results demonstrated the ability detect 1 ppb H2S response value (Rair/Rgas) 2.01 using 5 at % Au-WO3 average grain sizes around 15 nm. Additionally, energy barrier difference sensing materials air nitrogen (ΔEb) power law exponent (n) determined be 0.36 eV 0.7, respectively, 450 °C indicating that O– predominately ionic oxygen species adsorption significantly altered Schottky between grain. Such quantitative analysis provides comprehensive understanding mechanism.

Language: Английский

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Influence of ZnO hexagonal pyramid nanostructures for highly sensitive and selective NO2 gas sensor

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 994, P. 174625 - 174625

Published: April 24, 2024

Language: Английский

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