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ZnS Quantum Dot Based Acetone Sensor for Monitoring Health-Hazardous Gases in Indoor/Outdoor Environment
Rajneesh Kumar Mishra1, Gyu-Jin Choi1, Hyeon-Jong Choi1
1Department of Physics, Yeungnam University, Gyeongsan 38541, Gyeongbuk, Korea.
Micromachines
|June 2, 2021
Summary
This study synthesized zinc sulfide quantum dots (ZnS QDs) for acetone gas sensing. The resulting sensors show high sensitivity, selectivity, and stability, making ZnS QDs a promising nanomaterial for detecting acetone.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Quantum dots (QDs) offer unique properties for gas sensing.
- Developing efficient and selective acetone sensors is crucial for various applications.
Purpose of the Study:
- To synthesize zinc sulfide quantum dots (ZnS QDs) using a hot-injection method.
- To evaluate the performance of ZnS QDs in acetone gas sensing applications.
Main Methods:
- Synthesis of ZnS QDs via hot-injection.
- Characterization using X-ray diffraction (XRD) and transmission electron microscopy (TEM).
- Fabrication and testing of a ZnS QDs-based gas sensor.
Main Results:
- XRD confirmed the wurtzite phase of ZnS QDs (~5 nm).
- TEM analysis showed agglomerated ZnS QDs with (111) lattice planes.
- The sensor exhibited high sensitivity (92.4%), selectivity (91.1%), fast response/recovery (5.5s/6.7s), and stability (89.1%) for 100 ppm acetone at 175 °C.
- A theoretical detection limit of ~1.2 ppm was achieved.
Conclusions:
- ZnS QDs are effectively synthesized for gas sensing.
- The developed sensor demonstrates excellent performance for acetone detection.
- ZnS QDs show potential as a reliable nanomaterial for traceable acetone sensing.
