Amb motiu del tancament d'estiu, la validació de documents es reprendrà a partir del 28 d'agost de 2026. Disculpeu les molèsties.
Con motivo del cierre de verano, la validación de documentos se reanudará a partir del 28 de agosto de 2026. Disculpad las molestias
Due to the summer closure, document validation will resume starting August 28, 2026. We apologize for any inconvenience.

Files

695609.pdf (5.7 MB)

Document type

Article

Version

Published version

Publication date

2020-02-05

Publication license

cc-by (c) Qomaruddin et al., 2020
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/159219

Visible Light‐Driven p-Type Semiconductor Gas Sensors Based on CaFe2O4 Nanoparticles

Journal Title

Authors

Director/Tutor

Journal ISSN

Volume Title

Related resource

https://doi.org/10.3390/s20030850

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.

Subject

Òxid de ferro, Calcita, Òxids metàl·lics, Díodes electroluminescents, Alcohol

Subject (English)

Ferric oxide, Calcite, Metallic oxides, Light emitting diodes, Alcohol

Citation

Collections

Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
Publicacions de projectes de recerca finançats per la UE

Citation

Qomaruddin, et al. Visible Light‐Driven p-Type Semiconductor Gas Sensors Based on CaFe2O4 Nanoparticles. Sensors. 2020. Vol. 20, num. 3, pags. 850. ISSN 1424-8220. [consulted: 7 of August of 2026]. Available at: https://hdl.handle.net/2445/159219

Export metadata

JSON - METS

Share record