Highly sensitive NO2 gas sensor based on ZnO nanoarray modulated by oxygen vacancy with Ce doping

Sun, Kai; Zhan, Guanghui; Zhang, Lin; Wang, Zilin; Lin, Shiwei

doi:10.1016/j.snb.2023.133294

Cited by 67 publications

(7 citation statements)

References 49 publications

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“…The baseline resistance (around 30 MΩ) of SnO 2 /CsPbBr 3 is relatively low, which may be related to the fact that the SnO 2 /CsPbBr 3 material is rich in oxygen vacancies. 57 It can be intuitively seen from Fig. 6 that the response/recovery ability performs well.…”

Section: Resultsmentioning

confidence: 85%

Ag@SnO2/CsPbBr3 nanocomposite gas sensor for well-behaved low-concentration ethanolamine sensing at room temperature

Xu,

Jiang,

Liu

et al. 2024

Journal of Applied Physics

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It is a novel-effective process for realizing high-efficiency sensing and continuous gas monitoring by introducing precious metals into metal–oxide–semiconductors (MOSs). In this study, Ag is exploited to prepare surface functionalized SnO2 nanoparticles (NPs) and innovative xAg@SnO2/CsPbBr3, activating and catalyzing the gas sensing reactions on semiconductors. The results show that the precious metal Ag NPs promote the directional transport of carriers, thus improving the gas sensing performances. In addition, innovative xAg@SnO2/CsPbBr3 composites originated from Ag@SnO2 NPs and 3-mercaptopropionic acid treated all-inorganic perovskite CsPbBr3 are constructed to further accelerate electron transfer on heterointerfaces, enabling continuous and efficient monitoring of ethanolamine (EA) at room temperature. The sensing properties of Ag@SnO2/CsPbBr3 on various volatile organic compounds are investigated. Compared with pure CsPbBr3, the EA response of as-prepared 2Ag@SnO2/CsPbBr3 is obviously improved by about sevenfold. The response/recovery time is greatly shortened, besides the good stability. Another interesting result for xAg@SnO2/CsPbBr3 is the lower limit of detection of 44.43 ppb. The work demonstrates that Ag modification facilitates the adsorption/desorption rate and the response. Furthermore, the catalytic activation of noble metal Ag NPs and the synergistic interaction of SnO2/CsPbBr3 nano-heterojunctions promote EA sensing performances at room temperature.

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Section: Resultsmentioning

confidence: 85%

Ag@SnO2/CsPbBr3 nanocomposite gas sensor for well-behaved low-concentration ethanolamine sensing at room temperature

Xu,

Jiang,

Liu

et al. 2024

Journal of Applied Physics

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“…In 2 O 3 /Ti 3 C 2 T x -5 exhibits the most chemical adsorbed oxygen (O c ) and vacancy oxygen (O v ) species. In virtue of the chemically adsorbed oxygen involved in the NO 2 adsorption process and the vacancy oxygen species being the adsorption sites for NO 2 adsorption, the content of O c and O v is important for enhancing the NO 2 sensing performances . To explore the specific surface areas of Ti 3 C 2 T x , In 2 O 3 , and In 2 O 3 /Ti 3 C 2 T x samples, BET analysis is carried out and the results are illustrated in Figures d,e and S13, and Table S2.…”

Section: Resultsmentioning

confidence: 99%

Mesoporous and Encapsulated In₂O₃/Ti₃C₂T_x Schottky Heterojunctions for Rapid and ppb-Level NO₂ Detection at Room Temperature

Fan,

Yang,

Mehrez

et al. 2024

ACS Sens.

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Rapid and ultrasensitive detection of toxic gases at room temperature is highly desired in health protection but presents grand challenges in the sensing materials reported so far. Here, we present a gas sensor based on novel zero dimensional (0D)/two dimensional (2D) indium oxide (In 2 O 3 )/titanium carbide (Ti 3 C 2 T x ) Schottky heterostructures with a high surface area and rich oxygen vacancies for parts per billion (ppb) level nitrogen dioxide (NO 2 ) detection at room temperature. The In 2 O 3 /Ti 3 C 2 T x gas sensor exhibits a fast response time (4 s), good response (193.45% to 250 ppb NO 2 ), high selectivity, and excellent cycling stability. The rich surface oxygen vacancies play the role of active sites for the adsorption of NO 2 molecules, and the Schottky junctions effectively adjust the charge-transfer behavior through the conduction tunnel in the sensing material. Furthermore, In 2 O 3 nanoparticles almost fully cover the Ti 3 C 2 T x nanosheets which can avoid the oxidation of Ti 3 C 2 T x , thus contributing to the good cycling stability of the sensing materials. This work sheds light on the sensing mechanism of heterojunction nanostructures and provides an efficient pathway to construct high-performance gas sensors through the rational design of active sites.

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“…Subsequently, the adsorbed oxygen molecules capture electrons from the semiconductor conduction band, forming chemisorbed oxygen species (O 2 − , O − , O 2− ) and simultaneously creating an EDL at the semiconductor-gas interface. 67,[77][78][79] This EDL causes an increased electron transfer barrier. Reductive gases like ethanol can react with chemisorbed oxygen species to release electrons back into the semiconductor, thereby reducing the resistance.…”

Section: Working Mechanism Of Gas Sensors Based On Sacsmentioning

confidence: 99%

Emerging single-atom catalysts in the detection and purification of contaminated gases

Liu,

Yung,

Yang

et al. 2024

Chem. Sci.

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Highly sensitive NO2 gas sensor based on ZnO nanoarray modulated by oxygen vacancy with Ce doping

Cited by 67 publications

References 49 publications

Ag@SnO2/CsPbBr3 nanocomposite gas sensor for well-behaved low-concentration ethanolamine sensing at room temperature

Ag@SnO2/CsPbBr3 nanocomposite gas sensor for well-behaved low-concentration ethanolamine sensing at room temperature

Mesoporous and Encapsulated In₂O₃/Ti₃C₂T_x Schottky Heterojunctions for Rapid and ppb-Level NO₂ Detection at Room Temperature

Emerging single-atom catalysts in the detection and purification of contaminated gases

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Highly sensitive NO2 gas sensor based on ZnO nanoarray modulated by oxygen vacancy with Ce doping

Cited by 67 publications

References 49 publications

Ag@SnO2/CsPbBr3 nanocomposite gas sensor for well-behaved low-concentration ethanolamine sensing at room temperature

Ag@SnO2/CsPbBr3 nanocomposite gas sensor for well-behaved low-concentration ethanolamine sensing at room temperature

Mesoporous and Encapsulated In2O3/Ti3C2Tx Schottky Heterojunctions for Rapid and ppb-Level NO2 Detection at Room Temperature

Emerging single-atom catalysts in the detection and purification of contaminated gases

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Mesoporous and Encapsulated In₂O₃/Ti₃C₂T_x Schottky Heterojunctions for Rapid and ppb-Level NO₂ Detection at Room Temperature