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Carbonized polymer dots activated hierarchical tungsten oxide for efficient and stable triethylamine sensor
Mingxin Zhang1, Zhihui Zhao1, Bin Hui1
1State Key Laboratory of Bio-Fibers and Eco-Textiles, Collaborative Innovation Center for Marine Biomass Fibers, Materials and Textiles of Shandong Province, College of Materials Science and Engineering, Institute of Marine Biobased Materials, Qingdao University, Qingdao 266071, PR China.
Marine polysaccharide derived carbonized polymer dots (CPDs) enhance hierarchical tungsten oxide (WO3) for superior triethylamine gas detection. This novel heterostructure offers improved sensitivity, faster response, and lower operating temperatures for advanced gas sensing applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Hierarchical metal oxide semiconductors are promising for toxic gas detection.
- Optimizing structure and composition is key to enhancing sensor performance.
Purpose of the Study:
- To develop an efficient and stable triethylamine sensor using marine polysaccharide-derived carbonized polymer dots (CPDs) to activate hierarchical tungsten oxide (WO3).
- To investigate the role of the oxide/polymer/carbon heterostructure in improving gas-sensing properties.
Main Methods:
- Fabrication of a CPDs/WO3 heterostructure.
- Characterization of the sensor's performance for triethylamine detection.
- Analysis of gas adsorption-desorption kinetics and charge transfer mechanisms.
Main Results:
- The CPDs/WO3 sensor demonstrated a 4.3-fold higher response, significantly faster response/recovery times (4.3x/2.1x), a lower operating temperature (30°C), and a 2.4-fold lower detection limit for triethylamine compared to bare WO3.
- Adsorption-desorption kinetics were enhanced by 67 times due to CPDs, attributed to slit-like channels, defect sites, and a 0D-2D interface.
- Performance metrics surpassed most previous reports on triethylamine detection.
Conclusions:
- CPDs effectively activate hierarchical WO3 for highly efficient and stable triethylamine sensing.
- The study provides a new strategy for enhancing metal oxide semiconductor gas sensors and deepens the understanding of CPDs in gas sensing.
