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High-Performance Room-Temperature NO2 Gas Sensor Based on Au-Loaded SnO2 Nanowires under UV Light Activation
Bo Zhang1, Shuai Zhang1, Yi Xia2
1Engineering Research Center of IoT Technology Applications (Ministry of Education), Department of Electronic Engineering, Institute of Advanced Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, China.
Nanomaterials (Basel, Switzerland)
|November 26, 2022
Summary
Noble metal (Au) modification of tin dioxide (SnO2) nanowires enhances gas sensor performance under UV light. This localized surface plasmon resonance (LSPR) effect significantly improves NO2 detection at room temperature.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Optical excitation is key for room temperature (RT) gas sensor optimization.
- Noble metals act as effective photosensitizers via localized surface plasmon resonance (LSPR).
- LSPR generates electrons, enhancing semiconductor gas sensing.
Purpose of the Study:
- To synthesize and characterize pure SnO2 and Au/SnO2 nanowires (NWs).
- To investigate the role of LSPR in enhancing NO2 sensing properties.
- To compare sensor performance under dark and UV irradiation conditions.
Main Methods:
- Electrospinning for Au/SnO2 NW synthesis.
- Material characterization using XRD, EDS, HRTEM, and XPS.
- Gas sensing measurements for NO2 detection at RT.
Main Results:
- Au/SnO2 NWs exhibited lower photoinduced resistance than pure SnO2, confirming LSPR.
- Au/SnO2 NWs showed significantly enhanced NO2 sensing performance under UV irradiation.
- A response of 65 to 5 ppm NO2 was achieved with rapid response/recovery times (82/42 s).
Conclusions:
- LSPR effect is crucial for boosting Au/SnO2 NW gas sensor performance.
- UV-assisted LSPR significantly enhances NO2 detection at RT.
- The study proposes a gas-sensing mechanism for the observed performance improvements.
