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Issue 1, 2013
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2p or not 2p: tuppence-based SERS for the detection of illicit materials

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Abstract

Deposition of silver onto British 2p coins has been demonstrated as an efficient and cost effective approach to producing substrates capable of promoting surface enhanced Raman scattering (SERS). Silver application to the copper coins is undemanding taking just 20 s, and results in the formation of multiple hierarchial dendritic structures. To demonstrate that the silver deposition sites were capable of SERS the highly fluorescent Rhodamine 6G (R6G) probe was used. Analyses indicated that Raman enhancement only occurs at the silver deposition sites and not from the roughened copper surface. The robustness of the substrate in the identification and discrimination of illegal and legal drugs of abuse was then explored. Application of the drugs to the substrates was carried out using spotting and soaking methodologies. Whilst little or no SERS spectra of the drugs were generated upon spotting, soaking of the substrate in a methanolic solution of the drugs yielded a vast amount of spectral information. Excellent reproducibility of the SERS method and classification of three of the drugs, 4-methylmethcathinone (mephedrone), 5,6-methylenedioxy-2-aminoindane (MDAI) and 3,4-methylenedioxy-N-methylamphetamine (MDMA) were demonstrated using principal components analysis and partial least squares.

Graphical abstract: 2p or not 2p: tuppence-based SERS for the detection of illicit materials

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Publication details

The article was received on 18 Jul 2012, accepted on 10 Oct 2012 and first published on 11 Oct 2012


Article type: Paper
DOI: 10.1039/C2AN35974J
Citation: Analyst, 2013,138, 118-122
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    2p or not 2p: tuppence-based SERS for the detection of illicit materials

    S. Mabbott, A. Eckmann, C. Casiraghi and R. Goodacre, Analyst, 2013, 138, 118
    DOI: 10.1039/C2AN35974J

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