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Highly Selective H2S Gas Sensing Based on InAs-ZnSe Core-Shell Quantum Dots
Anh-Duy Nguyen1, Hossein Roshan2, Guncem Ozgun Eren2
1Department of Materials Science and Engineering, Inha University, Incheon 22212, South Korea.
ACS Sensors
|February 5, 2026
Summary
Colloidal Indium Arsenide (InAs) quantum dots offer a low-cost alternative for gas sensors. Coating InAs quantum dots with Zinc Selenide (ZnSe) significantly enhances their stability and H2S gas-sensing performance.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Conventional Indium Arsenide (InAs) gas sensors use expensive epitaxial methods, limiting research and low-cost manufacturing.
- Developing cost-effective and scalable synthesis routes for InAs-based gas sensors is crucial.
Purpose of the Study:
- To investigate the gas-sensing properties of colloidal Indium Arsenide (InAs) quantum dots (QDs).
- To explore the impact of a Zinc Selenide (ZnSe) shell on the stability and sensing performance of InAs QDs.
- To establish a low-cost fabrication pathway for III-V semiconductor-based gas sensors.
Main Methods:
- Synthesis of colloidal InAs QDs using a cost-effective hot-injection chemical route.
- Fabrication of InAs-ZnSe core-shell QDs by growing a ZnSe shell over InAs QDs.
- Evaluation of gas-sensing properties, specifically the response to Hydrogen Sulfide (H2S) gas.
Main Results:
- Colloidal InAs QD-based sensors exhibited a response of 2.97 to 50 ppm H2S.
- InAs-ZnSe core-shell QD sensors showed a significantly enhanced response of 26 to 50 ppm H2S.
- The ZnSe shell improved QD chemical stability and sensing performance.
Conclusions:
- Colloidal InAs QDs are feasible for gas-sensing applications.
- The InAs-ZnSe core-shell structure offers a promising low-cost, high-performance gas sensor solution.
- This work presents a scalable and accessible alternative to traditional epitaxial methods for III-V semiconductor sensors.
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