First-principles study of the rectifying properties of Au/SnO2 interface

Chen, Yue; Fang, Wenyu; Liu, Fengxin; Kuang, Kuan; Xiao, Xiong; Wei, Haoran; Li, Mingkai; He, Yunbin

doi:10.1016/j.apsusc.2023.157939

Cited by 4 publications

(2 citation statements)

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“…The charge transfer at the Au/SnO 2 interface will form a depletion zone in the SnO 2 semiconductor as depicted in Figure 6g. This type of charge transfer occurs due to the high oxygen vacancy 50 on the film formed by AuNPs. The depleted area around the Au nanoparticles are portrayed in Figure 6h.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In contrast, the SnO 2 -based sensor maintains a consistent response across varying operating voltages. This intriguing behavior may be attributed to localized dipoles at the Au nanoparticles (NPs) and SnO 2 interface. − A comparative analysis investigated the Au/SnO 2 dipole effect and the influence of operating voltage on the sensor’s response to 100 ppb H 2 S gas. In the response vs operating voltage curve (Figure c), the SnO 2 -based sensor maintains a consistent response at 13 ± 3% across different voltages (Figure S8a), whereas the Au/SnO 2 -based sensor demonstrates varying responses at different voltages.…”

Section: Resultsmentioning

confidence: 99%

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Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

Deb,

Lu,

Zan

2024

ACS Sens.

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Although semiconductor metal oxide-based sensors are promising for gas sensing, low-power and room temperature operation (24 ± 1 °C) remains desirable for practical applications particularly considering the request of energy saving or net zero emission. In this study, we demonstrate a Au/SnO 2 -based ultrasensitive H 2 S gas sensor with a limit of detection (LOD) of 2 ppb, operating at very low voltages (0.05 to 0.5 V) at room temperature. The Au/SnO 2 -based sensor showed approximately 7 times higher response (the ratio of change in the current to initial current) of ∼270% and 4 times faster recovery (126 s) compared to the pure SnO 2 -based sensor when exposed to 500 ppb H 2 S gas concentration at 0.5 V operating voltage at relative humidity (RH) 17.5 ± 2.5%. The enhancement can be attributed to the catalytic characteristics of AuNPs, increasing the number of adsorbed oxygen species on sensing material surfaces. Additionally, AuNPs aid in forming flower-petal-like Au/SnO 2 nanostructures, offering a larger surface area and more active sites for H 2 S sensing. Moreover, at low voltage (<1 V), the localized dipoles at the Au/SnO 2 interface may further enhance the absorption of polar oxygen molecules and hence promote the reaction between H 2 S and oxygen species. This low-power, ultrasensitive H 2 S sensor outperforms high-powered alternatives, making it ideal for environmental, food safety, and healthcare applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

Deb,

Lu,

Zan

2024

ACS Sens.

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First principles insights into the electronic and magnetic properties of SnO2(110) doped with VIII-group transition metal single ato

Zhao,

Chen,

Liu

et al. 2024

Chemical Physics Letters

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Theoretical investigation of 4d noble metal (Ru, Rh or Pd) single atom structures influencing surface oxygen behavior on SnO2(1 1 0)

Chen,

Zhao,

Liu

et al. 2024

Inorganic Chemistry Communications

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First-principles study of the rectifying properties of Au/SnO2 interface

Cited by 4 publications

References 50 publications

Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

First principles insights into the electronic and magnetic properties of SnO2(110) doped with VIII-group transition metal single ato

Theoretical investigation of 4d noble metal (Ru, Rh or Pd) single atom structures influencing surface oxygen behavior on SnO2(1 1 0)

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First-principles study of the rectifying properties of Au/SnO2 interface

Cited by 4 publications

References 50 publications

Achieving Room-Temperature ppb-Level H2S Detection in a Au-SnO2 Sensor with Low Voltage Enhancement Effect

Achieving Room-Temperature ppb-Level H2S Detection in a Au-SnO2 Sensor with Low Voltage Enhancement Effect

First principles insights into the electronic and magnetic properties of SnO2(110) doped with VIII-group transition metal single ato

Theoretical investigation of 4d noble metal (Ru, Rh or Pd) single atom structures influencing surface oxygen behavior on SnO2(1 1 0)

Contact Info

Product

Resources

About

Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect

Achieving Room-Temperature ppb-Level H₂S Detection in a Au-SnO₂ Sensor with Low Voltage Enhancement Effect