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A Highly Sensitive Surface-Modified Porous Carbon Nanotube-Based Sensor for Ammonia Gas Detection.
Shah Masheerul Aalam1, Mohd Sarvar1, Mohd Sadiq1,2
1Material Science Lab, Department of Physics, Jamia Millia Islamia, New Delhi 110025, India.
ACS Omega
|February 5, 2024
Summary
Decorated multi-walled carbon nanotubes (MWCNTs) show enhanced ammonia gas sensing performance compared to pristine MWCNTs. Indium nanoparticle decoration significantly improves response and sensitivity for gas detection applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Multi-walled carbon nanotubes (MWCNTs) are promising materials for gas sensing due to their unique electrical and structural properties.
- Enhancing the gas sensing performance of MWCNTs is crucial for developing sensitive and selective gas detection systems.
- Decoration with metal nanoparticles is a common strategy to improve the sensitivity and response time of carbon nanotube-based sensors.
Purpose of the Study:
- To investigate the effect of Indium (In) nanoparticle decoration on the gas sensing behavior of multi-walled carbon nanotubes (MWCNTs).
- To compare the ammonia gas sensing performance of pristine and decorated MWCNTs.
- To analyze the structural, electrical, and elemental properties of the prepared materials.
Main Methods:
- Decoration of MWCNTs with pure Indium (In) metal nanoparticles using the RF-sputtering method.
- Gas sensing measurements were conducted in a temperature-controlled environment using ammonia gas at a 10 ppm concentration.
- Structural, electrical, and elemental characterization using Field Emission Scanning Electron Microscopy (FESEM), Energy-Dispersive X-ray spectroscopy (EDX), Raman spectroscopy, Fourier-Transform Infrared spectroscopy (FTIR), and X-ray Diffraction (XRD).
Main Results:
- Decorated MWCNTs exhibited a higher sensing response (144%) compared to pristine MWCNTs (117%) for ammonia gas.
- The reaction time for decorated MWCNTs was faster (1-7 s) than for pristine MWCNTs (1-10 s).
- Sensitivity increased with decoration time, reaching 0.57 (57%) for 9 min of decoration, compared to 0.45 (45%) for pristine MWCNTs. Recovery rates between 80-85% and 10-day stability were also observed.
Conclusions:
- Indium nanoparticle decoration significantly enhances the gas sensing performance of MWCNTs for ammonia detection.
- The RF-sputtering method is effective for preparing In-decorated MWCNTs with improved gas sensing characteristics.
- The study demonstrates the potential of decorated MWCNTs as highly sensitive and responsive materials for gas sensors.
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