Advances in nanofabrication have allowed the construction of new and more reproducible substrates for the Raman detection of trace antimicrobials in water.  The work presented herein combines electron beam lithography and reactive ion etching for the construction, testing and validation of plasmonic hybrid morphologies nanoarrays for the detection of arsenic antimicrobials in water.  Control of simple fabrication parameters such as interparticle spacing and its orientation result in over a tenfold improvement in the Raman response.  Employing 632.8 nm excitation frequency, parallel oriented features with 200 nm gap resulted in over an order of magnitude increase in the SERS signal relative to Ag/PDMS nanocomposites.  Monitoring of As-C stretching band allowed the detection of 4-arsanilic acid in water, within ppm range. Surface enhancement factors for this substrate employing 532 and 785 nm excitation wavelengths were within 5-6 orders of magnitude, respectively.  The effect of substrate morphology on the SEF is presented.

Hybrid morphology nanoarrays as plasmonic Raman probes for the detection of arsenic antimicrobials

245th National Meeting (2013)

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