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Conductometric Sensing with Individual InAs Nanowires

NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR, Piazza San Silvestro 12, 56127 Pisa, Italy
Department of Information Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy
Department of ECE, George Washington University, Washington, DC 20052, USA (current address)
CNR-INO Brescia, Via Branze 45, 25123 Brescia, Italy
Authors to whom correspondence should be addressed.
Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA (current address).
Sensors 2019, 19(13), 2994;
Received: 20 May 2019 / Revised: 5 July 2019 / Accepted: 5 July 2019 / Published: 7 July 2019
(This article belongs to the Special Issue Advanced Nanomaterials based Gas Sensors)
In this work, we isolate individual wurtzite InAs nanowires and fabricate electrical contacts at both ends, exploiting the single nanostructures as building blocks to realize two different architectures of conductometric sensors: (a) the nanowire is drop-casted onto—supported by—a SiO2/Si substrate, and (b) the nanowire is suspended at approximately 250 nm from the substrate. We test the source-drain current upon changes in the concentration of humidity, ethanol, and NO2, using synthetic air as a gas carrier, moving a step forward towards mimicking operational environmental conditions. The supported architecture shows higher response in the mid humidity range (50% relative humidity), with shorter response and recovery times and lower detection limit with respect to the suspended nanowire. These experimental pieces of evidence indicate a minor role of the InAs/SiO2 contact area; hence, there is no need for suspended nanostructures to improve the sensing performance. Moreover, the sensing capability of single InAs nanowires for detection of NO2 and ethanol in the ambient atmosphere is reported and discussed. View Full-Text
Keywords: InAs nanowires; gas sensing; electrical transport InAs nanowires; gas sensing; electrical transport
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MDPI and ACS Style

Demontis, V.; Rocci, M.; Donarelli, M.; Maiti, R.; Zannier, V.; Beltram, F.; Sorba, L.; Roddaro, S.; Rossella, F.; Baratto, C. Conductometric Sensing with Individual InAs Nanowires. Sensors 2019, 19, 2994.

AMA Style

Demontis V, Rocci M, Donarelli M, Maiti R, Zannier V, Beltram F, Sorba L, Roddaro S, Rossella F, Baratto C. Conductometric Sensing with Individual InAs Nanowires. Sensors. 2019; 19(13):2994.

Chicago/Turabian Style

Demontis, Valeria, Mirko Rocci, Maurizio Donarelli, Rishi Maiti, Valentina Zannier, Fabio Beltram, Lucia Sorba, Stefano Roddaro, Francesco Rossella, and Camilla Baratto. 2019. "Conductometric Sensing with Individual InAs Nanowires" Sensors 19, no. 13: 2994.

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