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http://hdl.handle.net/2445/130016
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 Nanotecnologia Gas detectors Power electronics Nanotechnology |
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: https://doi.org/10.1021/acssensors.9b00150 |
It is part of: | ACS Sensors, 2019, vol. in press |
URI: | http://hdl.handle.net/2445/130016 |
Related resource: | https://doi.org/10.1021/acssensors.9b00150 |
ISSN: | 2379-3694 |
Appears in Collections: | Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) Publicacions de projectes de recerca finançats per la UE |
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