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Paper-based SERS active substrates on demand

Joshi, Pushkaraj and Santhanam, Venugopal (2016) Paper-based SERS active substrates on demand. In: RSC ADVANCES, 6 (72). pp. 68545-68552.

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Official URL: http://dx.doi.org/10.1039/c6ra07280a

Abstract

Surface Enhanced Raman Spectroscopy (SERS) is an important technique for molecular analysis under ambient conditions, and the use of paper-based silver nanostructures as a disposable SERS substrate is an attractive option for low-cost, point-of-use analysis. However, the activity of pre-fabricated silver nanostructures is affected by tarnishing and necessitates either storage under inert gas conditions or use of a protective layer on the surface. But neither of these approaches are satisfactory in terms of cost and performance in real-world settings. To address this, we report a print-expose-develop process, based on silver-halide photography, to fabricate SERS active silver nanowire networks on demand using a desktop inkjet printer. This process involves only the printing of silver and halide salt solutions and obviates the need for complex colloidal ink formulation steps reported in earlier studies on inkjet printed SERS substrates. Significantly, the printed and photo-exposed silver halide films retain silver in a stable latent-image form for more than 1 year under ambient conditions. Upon demand at the point-of-use, the latent silver can be easily developed into highly active SERS-active nanostructures, with average EF similar to 10(4), by dipping in a standard photographic developer solution and rinsing.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 08 Oct 2016 07:29
Last Modified: 08 Oct 2016 07:29
URI: http://eprints.iisc.ac.in/id/eprint/54718

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