Gold nanoparticle superlattices as functional solids for concomitant conductivity and SERS tuning

Shibu, Edakkattuparambil Sidharth ; Cyriac, Jobin ; Pradeep, Thalappil ; Chakrabarti, J. (2011) Gold nanoparticle superlattices as functional solids for concomitant conductivity and SERS tuning Nanoscale, 3 (3). pp. 1066-1072. ISSN 2040-3364

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Official URL: http://pubs.rsc.org/en/Content/ArticleLanding/2011...

Related URL: http://dx.doi.org/10.1039/C0NR00670J

Abstract

Mercaptosuccinic acid protected gold nanoparticles (Au@MSA) self assemble to form superlattice (SL) crystals at the air-water interface. These have been used for gas adsorption. The current-voltage (I-V) characteristics of the SL film with embedded SL crystals, obtained by four probe measurements, show Ohmic conduction. The conductance observed was proportional to the polarizability of the adsorbed gases. The current through the SL decreases on adsorption of the gas along with decrease in the SERS intensity of a probe molecule from the crystals. We rationalise our observation of the linear dependence of the conductance on the polarizability of the adsorbed gas using a simple model calculation. Variation of the conductance may be useful in designing electrical switches operating at the nanometre length scales.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:82422
Deposited On:10 Feb 2012 12:54
Last Modified:18 May 2016 23:38

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