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Title: A parts per billion (ppb) sensor for NO2 with microwatt (μW) power requirements based on micro light plates
Author: Casals Guillén, Olga
Markiewicz, Nicolai
Fábrega, Cristian
Gràcia Tortadés, Isabel
Cané i Ballart, Carles
Wasisto, Hutomo Suryo
Waag, Andreas
Prades García, Juan Daniel
Keywords: Detectors de gasos
Electrònica de potència
Gas detectors
Power electronics
Issue Date: 13-Feb-2019
Publisher: American Chemical Society
Abstract: A film of gas sensitive ZnO nanoparticles has been coupled with a low-power micro light plate (μLP) to achieve a NO2-parts-per-billion conductometric gas sensor operating at room temperature. In this μLP configuration, an InGaN-based LED (emitting at 455 nm) is integrated at a few hundred nanometers distance from the sensor material, leading to sensor photoactivation with well controlled, uniform, and high irradiance conditions, and very low electrical power needs. The response curves to different NO2 concentrations as a function of the irradiance displayed a bell-like shape. Responses of 20% to 25 ppb of NO2 were already observed at irradiances of 5 mWatts·cm-2 (applying an electrical power as low as 30 μW). In the optimum illumination conditions (around 60 mWatts·cm-2, or 200 μW of electric power), responses of 94% to 25 ppb were achieved, corresponding to a lower detection limit of 1 ppb of NO2. Higher irradiance values worsened the sensor response in the parts-per-billion range of NO2 concentrations. The responses to other gases such as NH3, CO, and CH4 were much smaller, showing a certain selectivity toward NO2. The effects of humidity on the sensor response are also discussed.
Note: Versió postprint del document publicat a:
It is part of: ACS Sensors, 2019, vol. in press
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ISSN: 2379-3694
Appears in Collections:Publicacions de projectes de recerca finançats per la UE
Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

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