Issue 3, 2011
From the journal:

Nanoscale

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

Edakkattuparambil Sidharth Shibu,a   Jobin Cyriac,ab   Thalappil Pradeep*a  and  J. Chakrabarti*c  

* Corresponding authors

a DST Unit on Nanoscience (DST UNS), Department of Chemistry and Sophisticated Analytical Instrument Facility, Indian Institute of Technology, Madras, Chennai, India

b The Aston Labs for Mass Spectrometry, Department of Chemistry, Purdue University, West Lafayette, USA

c S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, India
E-mail: pradeep@iitm.ac.in, jaydeb@bose.res.in
Fax: +91-44 2257-0545

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.

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

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Supplementary files

Article information

DOI
https://doi.org/10.1039/C0NR00670J
Article type
Paper
Submitted
13 Sep 2010
Accepted
06 Nov 2010
First published
16 Dec 2010

Nanoscale, 2011,3, 1066-1072

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

E. S. Shibu, J. Cyriac, T. Pradeep and J. Chakrabarti, Nanoscale, 2011, 3, 1066 DOI: 10.1039/C0NR00670J

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