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A high-performance room-temperature NH3 gas sensor based on WO3/TiO2 nanocrystals decorated with Pt NPs
Zhixuan Wu1,2, Zhengai Chen2, Zhixiang Deng2
1School of Physical Science and Technology, ShanghaiTech University Shanghai 201210 China wuzhx1@shanghaitech.edu.cn.
RSC Advances
|April 17, 2024
Summary
Platinum-modified tungsten oxide-titanium dioxide nanocrystals offer enhanced room-temperature ammonia (NH3) gas sensing. This breakthrough promises more sensitive and faster detection for clinical breath analysis.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Ammonia (NH3) gas detection is crucial for clinical breath analysis.
- Developing high-performance, room-temperature sensors remains a challenge.
Purpose of the Study:
- To synthesize and characterize Pt-modified WO3-TiO2 nanocrystals for NH3 sensing.
- To evaluate the sensing performance of these nanocrystals at room temperature.
Main Methods:
- Two-step hydrothermal synthesis of Pt@WO3-TiO2 nanocrystals.
- Structural characterization using SEM, TEM, XRD, and XPS.
- Gas sensing performance evaluation at room temperature.
Main Results:
- 10 at% Pt@WO3-TiO2 nanocrystals exhibited optimal NH3 sensing.
- Sensitivity increased tenfold compared to unmodified sensors, reaching 75 ppb detection limit.
- Achieved a response of 92.28 to 50 ppm NH3 with rapid response/recovery times (23s/8s).
Conclusions:
- Synergistic effects of Pt modification, space charge layer, and enhanced electron transfer improve NH3 sensing.
- Pt@WO3-TiO2 nanocrystals show significant potential for clinical breath testing applications.
