Ppb-level NO2 gas sensor based on WO3/In2S3 heterostructure by hydrothermal method: A convenient and wearable real-time detection system

Wang, Dong; Zhao, Huizhang; Yu, Haibo; Chen, Yanan; Ma, Xiao; Shang, Eryang; Chen, Hong; Kang, Xingyu; Zhang, Jiawei; Tan, Rong; Fang, Hairui

doi:10.1016/j.ceramint.2024.06.075

Ceramics International

2024

DOI: 10.1016/j.ceramint.2024.06.075

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Ppb-level NO2 gas sensor based on WO3/In2S3 heterostructure by hydrothermal method: A convenient and wearable real-time detection system

Dong Wang,

Huizhang Zhao,

Haibo Yu

et al.

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Unraveling the Effect of Oxygen Vacancy on WO₃ Surface for Efficient NO₂ Detection at Low Temperature

Li,

Wang,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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Oxygen vacancies (VO) in metal oxide semiconductors play an important role in improving gas-sensing performance of chemiresistive gas sensors. Nonetheless, there is still a lack of clear understanding of the inherent mechanism of the influence of oxygen vacancies on gas sensing due to generally focusing on the concentration of VO. Herein, oxygen vacancies were rationally modulated in WO3 nanoflower structures via an annealing process, resulting in a transformation of VO from neutral (VO 0) to a doubly ionized (VO 2+) state. Density functional theory (DFT) calculations indicate that VO 2+ is significantly more efficient than VO 0 for NO2 detection in competition with atmospheric O2. Benefiting from a high concentration of VO 2+, the WO3-450 (WO3 annealed at 450 °C) sensor exhibits excellent sensing performance with an ultrahigh sensitivity (3674.1 to 5 ppm NO2), superior selectivity, and long-term stability (one month). Furthermore, the sensor with the wide range of concentration detection not only can detect NO2 gas with parts per million (ppm) but also can detect NO2 with parts per billion (ppb) level concentration, with a high sensibility reaching 2.8 to 25 ppb NO2 and over 100 to 100 ppb NO2. This study elucidates the oxygen vacancy mediated sensing mechanism toward NO2 and provides an effective strategy for the rational design of gas sensors with high sensing performance.

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Unraveling the Effect of Oxygen Vacancy on WO₃ Surface for Efficient NO₂ Detection at Low Temperature

Li,

Wang,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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show abstract

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Ppb-level NO2 gas sensor based on WO3/In2S3 heterostructure by hydrothermal method: A convenient and wearable real-time detection system

Cited by 1 publication

References 44 publications

Unraveling the Effect of Oxygen Vacancy on WO₃ Surface for Efficient NO₂ Detection at Low Temperature

Unraveling the Effect of Oxygen Vacancy on WO₃ Surface for Efficient NO₂ Detection at Low Temperature

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Ppb-level NO2 gas sensor based on WO3/In2S3 heterostructure by hydrothermal method: A convenient and wearable real-time detection system

Cited by 1 publication

References 44 publications

Unraveling the Effect of Oxygen Vacancy on WO3 Surface for Efficient NO2 Detection at Low Temperature

Unraveling the Effect of Oxygen Vacancy on WO3 Surface for Efficient NO2 Detection at Low Temperature

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Product

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Unraveling the Effect of Oxygen Vacancy on WO₃ Surface for Efficient NO₂ Detection at Low Temperature

Unraveling the Effect of Oxygen Vacancy on WO₃ Surface for Efficient NO₂ Detection at Low Temperature