Conductometric Sensing with Individual InAs Nanowires

Year: 2019

Authors: Demontis V., Rocci M., Donarelli M., Maiti R., Zannier V., Beltram F., Sorba L., Roddaro S., Rossella F., Baratto C.

Autors Affiliation: CNR, Scuola Normale Super, NEST, Piazza San Silvestro 12, I-56127 Pisa, Italy; CNR, Ist Nanosci, Piazza San Silvestro 12, I-56127 Pisa, Italy; Univ Brescia, Dept Informat Engn, Via Branze 38, I-25123 Brescia, Italy; George Washington Univ, Dept ECE, Washington, DC 20052 USA; CNR INO Brescia, Via Branze 45, I-25123 Brescia, Italy

Abstract: 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.

Journal/Review: SENSORS

Volume: 19 (13)      Pages from: 2994-1  to: 2994-15

More Information: This research was partially funded by CYBERSORT project financed by Regione Lombardia.
KeyWords: InAs nanowires; gas sensing; electrical transport
DOI: 10.3390/s19132994

Citations: 19
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