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Proceedings 2017, 1(4), 319; doi:10.3390/proceedings1040319

Near Infrared Plasmonic Gas Sensing with Doped Metal Oxide Nanocrystals

1
Dipartimento di Ingegneria Industriale, Università di Padova, Padova, Italy
2
School of Science, RMIT University, Melbourne, VIC, Australia
3
Dipartimento di Ingegneria Industriale, Università di L’Aquila, L’Aquila, Italy
Presented at the Eurosensors 2017 Conference, Paris, France, 3–6 September 2017.
*
Author to whom correspondence should be addressed.
Published: 5 September 2017
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Abstract

In this paper, we demonstrate the application of ZnO doped with gallium (GZO), aluminum (AZO) and germanium (GeZO) nanocrystals as novel plasmonic and chemiresistive sensors for the detection of hazardous gases including hydrogen (H2) and nitrogen dioxide (NO2). GZO, AZO and GeZO nanocrystals are obtained by non-aqueous colloidal heat-up synthesis with high transparency in the visible range and strong localized surface plasmon resonance (LSPR) in the near IR range, tunable with dopant concentration (up to 20% mol nominal). Thanks to the strong sensitivity of the LSPR to chemical and electrical changes occurring at the surface of the nanocrystals, such optical features can be used to detect the presence of toxic gases. By monitoring the changes in the dopant-induced plasmon resonance in the near infrared, we demonstrate that GZO, AZO and GeZO thin films prepared depositing an assembly of highly doped ZnO colloids are able to optically detect both oxidizing and reducing gases at mild (<100 °C) operating temperatures. Combined optical and electrical measurements show that the dopants within ZnO nanocrystals enhance the gas sensing response compared to undoped ZnO.
Keywords: transparent conductive oxides; doped zinc oxide; optical gas sensors transparent conductive oxides; doped zinc oxide; optical gas sensors
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sturaro, M.; Gaspera, E.D.; Cantalini, C.; Guglielmi, M.; Martucci, A. Near Infrared Plasmonic Gas Sensing with Doped Metal Oxide Nanocrystals. Proceedings 2017, 1, 319.

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