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In2O3 nanoparticles and nanoaggregates for formaldehyde recognition and mechanism insight: Enabled by engineering
Yan Liu1, Jiuyu Li2, Ruihua Zhao3
1College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, PR China; Department of Mining Engineering, Shanxi Institute of Energy, Taiyuan, 030600, PR China.
Developing advanced indium oxide (In2O3) nanomaterials with multiple crystal planes offers a high-performance solution for detecting toxic formaldehyde gas at low temperatures. This breakthrough enables efficient environmental monitoring and life science applications.
Area of Science:
- Materials Science
- Chemical Sensing
- Nanotechnology
Background:
- Formaldehyde is a toxic and carcinogenic gas requiring sensitive monitoring.
- Existing sensing materials often lack the required performance at low temperatures.
Purpose of the Study:
- To develop a high-performance sensing material for formaldehyde recognition.
- To enhance the sensing capabilities of indium oxide (In2O3) by integrating multiple crystal planes.
Main Methods:
- Synthesis of In2O3 nanoparticles and nanoaggregates with controlled structures and oxygen vacancies.
- Integration of multiple crystal planes in In2O3 to improve gas adsorption and electron transport.
- Characterization of sensing performance including sensitivity, selectivity, response/recovery time, and stability.
- Investigation of sensing mechanisms using in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy and DFT calculations.
- Fabrication of a portable sensing device using microelectron mechanical systems (MEMS).
Main Results:
- Optimized In2O3 demonstrated high sensitivity and selectivity to formaldehyde (<100 ppm) at a low temperature (120°C).
- The material exhibited fast response/recovery times and practical stability over 14 days.
- A low limit of detection (312 ppb) and quantitative monitoring capabilities were achieved.
- Sensing mechanisms involving formaldehyde adsorption, oxidation, and electron transfer were elucidated.
- DFT calculations confirmed the role of crystal planes in enhancing sensing performance.
Conclusions:
- The developed In2O3 material with integrated multiple crystal planes significantly enhances formaldehyde sensing performance.
- The findings pave the way for utilizing In2O3-based sensors in intelligent environmental monitoring and life science.
- The portable MEMS device demonstrates the practical applicability of these advanced oxide sensing materials.
