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dc.contributor.authorCasals Guillén, Olga-
dc.contributor.authorMarkiewicz, Nicolai-
dc.contributor.authorFábrega, Cristian-
dc.contributor.authorGràcia Tortadés, Isabel-
dc.contributor.authorCané i Ballart, Carles-
dc.contributor.authorWasisto, Hutomo Suryo-
dc.contributor.authorWaag, Andreas-
dc.contributor.authorPrades García, Juan Daniel-
dc.description.abstractA 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.-
dc.format.extent6 p.-
dc.publisherAmerican Chemical Society-
dc.relation.isformatofVersió postprint del document publicat a:
dc.relation.ispartofACS Sensors, 2019, vol. in press-
dc.rights(c) American Chemical Society , 2019-
dc.subject.classificationDetectors de gasos-
dc.subject.classificationElectrònica de potència-
dc.subject.otherGas detectors-
dc.subject.otherPower electronics-
dc.titleA parts per billion (ppb) sensor for NO2 with microwatt (μW) power requirements based on micro light plates-
Appears in Collections:Publicacions de projectes de recerca finançats per la UE
Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

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