Dogbone shaped and nanorod shaped gold nanoparticles are used as solution based surface enhanced Raman scattering (SERS) substrates for ultrasensitive detection of pesticides found in fruits and vegetables.  These nanoparticles have surface plasmon bands that are in resonance with the laser excitation wavelength of 785 nm.  The limits of detection achieved using SERS is much lower than that of the EPA set maximum concentration limits.  Both sensitive and selective detection of thiram, ferbam, and ziram has been shown with the gold nanorods.  The sensitivity is achieved by tuning the surface plasmon band (SPR) to the laser excitiation wavlength and the selectivity is achieved by combining barcoded principle components analysis of the SERS data.

Gold nanoparticles of different shapes for SERS based environmental sensing applications

249th National Meeting (2015)

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