Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/159219
Title: | Visible Light‐Driven p-Type Semiconductor Gas Sensors Based on CaFe2O4 Nanoparticles |
Author: | Qomaruddin Casals Guillén, Olga Utka, Andris Granz, Tony Waag, Andreas Wasisto, Hutomo Suryo Prades García, Juan Daniel Fábrega, Cristian |
Keywords: | Òxid de ferro Calcita Òxids metàl·lics Díodes electroluminescents Alcohol Ferric oxide Calcite Metallic oxides Light emitting diodes Alcohol |
Issue Date: | 5-Feb-2020 |
Publisher: | MDPI |
Abstract: | In this work, we present conductometric gas sensors based on p-type calcium iron oxide (CaFe2O4) nanoparticles. CaFe2O4 is a metal oxide (MOx) with a bandgap around 1.9 eV making it a suitable candidate for visible light-activated gas sensors. Our gas sensors were tested under a reducing gas (i.e., ethanol) by illuminating them with different light-emitting diode (LED) wavelengths (i.e., 465-640 nm). Regardless of their inferior response compared to the thermally activated counterparts, the developed sensors have shown their ability to detect ethanol down to 100 ppm in a reversible way and solely with the energy provided by an LED. The highest response was reached using a blue LED (465 nm) activation. Despite some responses found even in dark conditions, it was demonstrated that upon illumination the recovery after the ethanol exposure was improved, showing that the energy provided by the LEDs is sufficient to activate the desorption process between the ethanol and the CaFe2O4 surface. |
Note: | Reproducció del document publicat a: https://doi.org/10.3390/s20030850 |
It is part of: | Sensors, 2020, vol. 20, num. 3, p. 850 |
URI: | http://hdl.handle.net/2445/159219 |
Related resource: | https://doi.org/10.3390/s20030850 |
ISSN: | 1424-8220 |
Appears in Collections: | Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) Publicacions de projectes de recerca finançats per la UE |
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