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07:49
On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
Published on: August 5, 2016
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Selective Detection of Nitrogen-Containing Compound Gases
Ran Yoo1, Hyun-Sook Lee1, Wonkyung Kim2
1Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.
Sensors (Basel, Switzerland)
|August 25, 2019
Summary
This study explores five sensor materials for detecting harmful N-containing gases like trimethylamine and nitrogen dioxide. Metal oxide sensors showed high sensitivity to amines, while N-doped graphene detected nitric oxides, enabling gas differentiation.
Area of Science:
- Materials Science
- Chemical Sensing
- Nanotechnology
Background:
- N-containing gases like trimethylamine (TMA), triethylamine (TEA), ammonia (NH3), nitrogen monoxide (NO), and nitrogen dioxide (NO2) pose respiratory health risks.
- Developing selective and sensitive gas sensors is crucial for environmental monitoring and safety.
Purpose of the Study:
- To investigate the sensing performance of five distinct materials towards five N-containing gases.
- To evaluate the potential of these materials for selective gas detection and pattern recognition.
Main Methods:
- Synthesized and characterized Al-doped ZnO (AZO) nanoparticles, Pt-loaded AZO nanoparticles, Pt-loaded WO3 thin film, Au-loaded WO3 thin film, and N-doped graphene.
- Tested the gas sensing responses of each material to 10 ppm of TMA, TEA, NH3, NO, and NO2.
Main Results:
- ZnO- and WO3-based sensors exhibited n-type behavior with higher responses to tertiary amines than nitric oxides.
- N-doped graphene showed p-type behavior and selectively responded to nitric oxides.
- Au-loaded WO3 and Pt-loaded WO3 thin films demonstrated exceptional responses to TEA (~100,000) and NO2 (~-2700), respectively.
Conclusions:
- The combination of five sensor materials allows for selective pattern recognition, distinguishing between different N-containing gases.
- These materials offer superior sensing capabilities compared to existing semiconducting metal oxide sensors.
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