High-entropy oxide (FeCoNiCrMn)3O4 for room-temperature NO2 sensors

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 124(22)

Published: May 27, 2024

High-entropy oxides (HEOs) with a multi-cation structure have attracted significant attention in the fields of electrochemistry owing to their high entropy stability and cocktail effect. However, there has been very limited research on use HEO field sensing. In this work, we utilized FeCoNiCrMn high-entropy alloys as precursor synthesize (FeCoNiCrMn)3O4 investigated crystal structure, microscopic morphology, elemental valence state information, gas sensing performance. The sensor exhibited decent response NO2 at room temperature (RT) without any modification or sensitization methods. To verify mechanism, simulated interaction between five metal elements molecules by density functional theory, which reveals crucial synergistic effect from multiple cations enhance adsorption charge transfer molecules. This work explores application potential low-power sensors enriches material selection for RT sensors.

Language: Английский

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A flexible gas sensor based on one-dimensional Cu2O-SnO2/N-C nanofibers toward for NO2 detection at low temperature

Sensors and Actuators A Physical, Journal Year: 2025, Volume and Issue: unknown, P. 116257 - 116257

Published: Jan. 1, 2025

Language: Английский

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High-Sensitivity Room-Temperature Detection of H₂S Using ZnO/Ti₃C₂T_X Nanocomposite: Potential Applications in Exhaled Gas Monitoring

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 13, 2025

The detection of hydrogen sulfide (H2S) in exhaled breath at room temperature is essential for health monitoring and disease diagnosis. This study investigates a ZnO/Ti3C2TX nanocomposite synthesized by combining ZnO nanoparticles, prepared hydrothermal method, with Ti3C2TX MXene. Experimental results demonstrate that the sensors exhibit excellent H2S performance high sensitivity, rapid response time, robust recovery capability. Specifically, ZnO/Ti3C2TX-1.0 wt % sensor shows 85.116 5 ppm H2S, which 14-fold 35-fold greater than pure MXene, respectively. exhibits (50 s) time (115 100 ppb H2S. Additionally, it exceptional sensitivity to low concentrations, limit as 1 ppb. Based on sensing performance, oral gas demonstrates effectively differentiates levels healthy patient samples. These findings highlight potential temperature, offering new insights developing ultrasensitive biogas sensors.

Language: Английский

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Fabrication of MOF-derived porous Au@Co-ZnO nanostructures with excellent C₂H₅OH sensing performance

Microstructures, Journal Year: 2025, Volume and Issue: 5(3)

Published: April 15, 2025

Aim: Zinc oxide (ZnO) is an n-type semiconductor with a wide bandgap, excellent electron mobility, and stable chemical characteristics, making it potentially applicable in the field of gas sensing. However, conventional ZnO-based sensors face challenges such as high operating temperatures low sensitivity. Methods: In this paper, we first synthesized ZIF-8 rhombic dodecahedron structure using room-temperature precipitation method. By doping cobalt (Co) exchanging gold ions, followed by calcination air, obtained metal-organic framework (MOF) derived porous Au@Co-ZnO nanostructure. Results: This nanostructure retained large specific surface area characteristics ZIF-8, while its sensing performance was significantly enhanced compared to pure MOF-derived ZnO nanostructure, due Co nanoparticle modification. At ethanol concentration 100 ppm, sample demonstrated best at 140 °C, response value 205.3. result 28.9 times higher sample, which showed 7.1 under identical conditions. Additionally, optimal temperature 40 °C lower than that (180 °C). Furthermore, samples good stability selectivity for gas. Conclusion: The proposed nanostructures not only advance application materials detection but also offer novel approach boosting gas-sensing other metal materials.

Language: Английский

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A room-temperature NO2 gas sensor based on Zn2+ doped Cu2O/CuO composites with ultra-high response

Ceramics International, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 1, 2024

Language: Английский

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Nanostructures of metal oxides

Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Language: Английский

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