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Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review.
Sulaiman Khan1,2,3, David Newport1, Stéphane Le Calvé2,3
1School of Engineering, Bernal Institute, University of Limerick, Limerick V94 T9PX, Ireland.
Sensors (Basel, Switzerland)
|December 5, 2019
Summary
Deep-UV absorption spectrophotometry offers a sensitive and selective method for detecting environmental gases. Recent advancements focus on portable devices using LEDs, hollow core waveguides, and photodiodes for improved gas sensing capabilities.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Environmental Science
Background:
- Many gases of environmental and domestic importance strongly absorb deep-ultraviolet (UV) light at specific wavelengths.
- Deep-UV absorption spectrophotometry is a highly sensitive, reliable, self-referenced, and selective technique for gas sensing.
- Recent progress has been made in leveraging these properties for advanced gas detection.
Purpose of the Study:
- To review recent advancements in deep-UV absorption spectrophotometry for gas sensing.
- To assess and compare applications, progress, and challenges in UV emission sources, gas cells, and UV photodetectors.
- To discuss the development of portable sensitive spectrophotometers.
Main Methods:
- Review of recent literature on deep-UV absorption for gas sensing.
- Assessment of UV emission sources (LEDs), gas cells (hollow core waveguides - HCWs), and UV photodetectors (photodiodes).
- Discussion of theoretical aspects and challenges in developing portable spectrophotometers.
Main Results:
- Deep-UV absorption spectrophotometry enables sensitive and selective gas detection.
- LEDs offer portable, low-power, cost-effective UV sources suitable for absorbance measurements.
- HCWs serve as miniature gas cells for detecting low gas concentrations, and photodiodes provide selective, stable UV detection.
Conclusions:
- Portable UV absorption spectrophotometers can be effectively developed using LEDs, HCWs, and photodiodes.
- These components facilitate sensitive and selective detection of gases like ozone, NO2, SO2, and aromatic organic compounds.
- The inherent features of deep-UV absorption present tremendous potential for future gas sensing applications.
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