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TiO2/SnO2-Pt Janus-Type Nanofibers with Gradient Band Distribution for Enhanced Room-Temperature NO2 Detection via
Xinyu Wu1, Xiaowei Li1, Wanying Cheng1
1State Key Laboratory of Integrated Optoelectronics, Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education, School of Physics, Northeast Normal University, Changchun 130024, China.
ACS Sensors
|June 27, 2026
Summary
This study introduces novel TiO2/SnO2-Pt Janus-type heterojunction nanofibers for enhanced room-temperature gas sensing. These nanofibers improve photoexcited carrier utilization for highly sensitive nitrogen dioxide detection.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Photoexcited metal oxide semiconductor (MOS) gas sensors offer low power and high safety but suffer from poor charge carrier dynamics.
- Inefficient charge separation and recombination limit the performance of conventional photoactivated MOS sensors.
Purpose of the Study:
- To design and fabricate ternary TiO2/SnO2-Pt Janus-type heterojunction nanofibers (JHNFs) with gradient band distribution.
- To enhance photogenerated carrier separation and utilization for high-performance room-temperature gas sensing.
- To investigate the sensing mechanism for nitrogen dioxide (NO2) detection.
Main Methods:
- Fabrication of one-dimensional TiO2/SnO2-Pt JHNFs with a gradient band structure.
- Characterization of the nanofiber morphology and band distribution.
- Performance evaluation of the JHNFs-based sensor for NO2 detection under UV photoexcitation at room temperature.
Main Results:
- The TiO2/SnO2-Pt JHNFs exhibited a gradient band distribution facilitating cascade charge transfer.
- Sensors showed significantly enhanced NO2 response (5.3-fold over SnO2, 6.7-fold over TiO2) under UV light.
- Achieved a low detection limit of 50 ppb, rapid response/recovery times, and excellent long-term stability.
Conclusions:
- The JHNFs design effectively improves photogenerated carrier separation and utilization for gas sensing.
- Gradient band distribution is a key factor in enhancing the performance of photoactivated gas sensors.
- This work provides a viable strategy for developing advanced room-temperature photoactivated gas sensors.
