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Published on: December 6, 2021
CdO-based nanostructures as novel CO(2) gas sensors
T Krishnakumar1, R Jayaprakash, T Prakash
1Department of Physics, King College of Technology, Nallur, Namakkal, Tamilnadu-637 020, India.
Nanotechnology
|July 21, 2011
Summary
Novel cadmium oxide (CdO) nanostructures were synthesized for CO2 sensing. These CdO thick films show promise for practical applications in gas sensing technology.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Development of efficient gas sensors is crucial for environmental monitoring and industrial safety.
- Cadmium oxide (CdO) nanostructures offer unique electrical and optical properties suitable for sensing applications.
Purpose of the Study:
- To synthesize crystalline cadmium hydroxide/cadmium carbonate (Cd(OH)2/CdCO3) nanowires and convert them into cadmium oxide (CdO) nanostructures.
- To investigate the morphology, microstructure, and electrical properties of the synthesized CdO nanostructures.
- To fabricate and evaluate CdO-based thick film resistive sensors for carbon dioxide (CO2) detection.
Main Methods:
- Microwave-assisted wet chemical synthesis of Cd(OH)2/CdCO3 nanowires.
- Thermal treatment in air to convert nanowires into CdO nanostructures.
- Characterization using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and thermogravimetry-differential scanning calorimetry (TGA-DSC).
- Fabrication of resistive solid-state sensors on ceramic substrates with interdigitated contacts.
- Gas sensing measurements for CO2 detection in synthetic air.
Main Results:
- Successful synthesis of Cd(OH)2/CdCO3 nanowires (0.3-several microns length, 5-30 nm diameter) and their transformation into CdO nanostructures.
- Observed wire-to-rod morphological transformation and decreased electrical resistance with increasing annealing temperature.
- Demonstrated CO2 sensing capabilities of CdO thick films in the concentration range of 0.2-5 v/v% (2000-50,000 ppm).
- Investigated the influence of annealing temperature, working temperature, and CO2 concentration on sensor performance (sensitivity, response/recovery time, stability).
Conclusions:
- CdO nanostructures derived from Cd(OH)2/CdCO3 nanowires exhibit promising gas sensing properties for CO2.
- The developed CdO-based thick film sensors show potential for practical CO2 monitoring applications.
- Optimization of annealing and working temperatures can further enhance sensor performance.
