Abstract
A facile and rapid method for the in situ fabrication of highly active surface-enhanced Raman scattering (SERS) substrates is presented. These SERS-active substrates are produced on the surface of microelectrode chips through an electric field-guided assembly of silver nanocolloids, which yields highly branched, dendritic nanoparticle structures. Fractal dimension analysis of the dendrites shows a value of 1.78, indicating a high degree of complexity. The sensitivity of the SERS substrates is demonstrated with the detection of trace amounts of cocaine in water. By analyzing the collected spectra using principal component analysis, spectra can be correctly identified and quantified in an automated fashion for several different concentrations
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