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Semiconductor-like Sensitivity in Metallic Ultrathin Gold Nanowire-Based Sensors

Roy, Ahin and Pandey, Tribhuwan and Ravishankar, N and Singh, Abhishek K (2014) Semiconductor-like Sensitivity in Metallic Ultrathin Gold Nanowire-Based Sensors. In: JOURNAL OF PHYSICAL CHEMISTRY C, 118 (32). pp. 18676-18682.

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Official URL: http://dx.doi.org/ 10.1021/jp5042052

Abstract

Due to the ease of modification of electronic structure upon analyte adsorption, semiconductors have been the preferred materials as chemical sensors. At reduced dimension, however, the sensitivity of semiconductor-based sensors deteriorates significantly due to passivation, and often by increased band gap caused by quantum confinement. Using first-principles density functional theory combined with Boltzmann transport calculations, we demonstrate semiconductor-like sensitivity toward chemical species in ultrathin gold nanowires (AuNWs). The sensing mechanism is governed by the modification of the electronic structure of the AuNW as well as scattering of the charge carriers by analyte adsorption. Most importantly, the sensitivity exhibits a linear relationship with the electron affinities of the respective analytes. Based on this relationship, we propose an empirical parameter, which can predict an analyte-specific sensitivity of a AuNW, rendering them as effective sensors for a wide range of chemical an alytes.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 18 Sep 2014 09:10
Last Modified: 18 Sep 2014 09:10
URI: http://eprints.iisc.ac.in/id/eprint/49894

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