One-step synthesis of Bi2O2Se microstructures for trace oxygen gas sensor application

Bae, Ji Kwon; Cho, Hyeon Ho; Shin, Ho-Jun; Kim, Young‐Ho; Ko, Hang-Ju; Lee, Seong Joo; Megersa, Daba Deme; Gudena, Gutema Teshome; Chae, Sudong; Cho, In Sun; Yu, Hak Ki

doi:10.1016/j.snb.2023.134398

Cited by 6 publications

(2 citation statements)

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“…Considering that Bi 2 O 2 Se emerges as a promising material for gas sensing 25 , 26 , this investigation selects the Bi 2 O 2 Se as the sensing block. By molecular beam epitaxy, this research is to synthesize single crystalline of Bi 2 O 2 Se with atomic roughness on the SrTiO 3 (001) substrate.…”

Section: Resultsmentioning

confidence: 99%

Molecularly specific detection towards trace nitrogen dioxide by utilizing Schottky-junction-based Gas Sensor

Xu,

Zhou,

et al. 2024

Nat Commun

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Trace NO2 detection is essential for the production and life, where the sensing strategy is appropriate for rapid detection but lacks molecular specificity. This investigation proposes a sensing mechanism dominated by surface-scattering to achieve the molecularly-specific detection. Two-dimensional Bi2O2Se is firstly fabricated into a Schottky-junction-based gas-sensor. Applied with an alternating excitation, the sensor simultaneously outputs multiple response signals (i.e., resistance, reactance, and the impedance angle). Their response times are shorter than 200 s at room temperature. In NO2 sensing, these responses present the detection limit in ppt range and the sensitivity is up to 16.8 %·ppb−1. This NO2 sensitivity presents orders of magnitude higher than those of the common gases within the exhaled breath. The impedance angle is involved in the principle component analysis together with the other two sensing signals. Twelve kinds of typical gases containing NO2 are acquired with molecular characteristics. The change in dipole moment of the target molecule adsorbed is demonstrated to correlate with the impedance angle via surface scattering. The proposed mechanism is confirmed to output ultra-sensitive sensing responses with the molecular characteristic.

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Section: Resultsmentioning

confidence: 99%

Molecularly specific detection towards trace nitrogen dioxide by utilizing Schottky-junction-based Gas Sensor

Xu,

Zhou,

et al. 2024

Nat Commun

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“…Similarly, in 2023 Bae et al reported the morphological dependence of the CVD-grown Bi 2 O 2 Se nanostructures for oxygen sensing applications. 76 Among the three different morphologies (flakes, seed and bulk), vertical flakes show the highest sensing responses of 0.59% and 4.93% for 10 and 100 ppm, respectively, with excellent detection linearity for the 10 to 100 ppm range at an operating temperature of 100 °C. The vertical flake morphology also has the advantage of fast response and recovery over the other morphologies.…”

Section: Gas Sensingmentioning

confidence: 96%