Compact and Highly Sensitive NO2 Photoacoustic Sensor for Environmental Monitoring

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Yufeng PanHongpeng Wu

Abstract

A nitrogen dioxide (NO2) photoacoustic sensor for environmental monitoring was developed using a low-cost high-power laser diode emitting at 450 nm. A compact low-noise photoacoustic detection module was designed to reduce the sensor size and to suppress noise. A LabVIEW-based control system was employed for the sensor. The parameters of the sensor were studied in detail in terms of laser power and operating pressure. The linearity of the sensor response with laser power and NO2 concentration confirms that saturation does not occur. At atmospheric pressure, a 3σ detection limit of 250 ppt (part per trillion by volume) was achieved with a 1-s averaging time, which corresponds to the specific detectivity of 3.173 × 10-9 W cm-1 Hz-1/2. A 72 h outdoor continuous on-line monitoring of environmental NO2 was implemented to demonstrate the reliability and validity of the developed NO2 sensor.

References

Nov 25, 2004·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Jean-Philippe BessonLuc Thévenaz
Jul 11, 2006·Proceedings of the National Academy of Sciences of the United States of America·Michael PushkarskyC Kumar N Patel
Dec 2, 2009·The Review of Scientific Instruments·Patricia CastellanosRussell R Dickerson
Nov 17, 2016·Proceedings of the National Academy of Sciences of the United States of America·Gehui WangMario J Molina

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Citations

May 15, 2020·Sensors·Stefan Palzer
Nov 8, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Cristina PopaMioara Petrus
Sep 11, 2021·ACS Sensors·Juho KarhuErkki Ikonen

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Methods Mentioned

BETA
irradiates

Software Mentioned

CNEMC
LabVIEW

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