EFFECT OF CURRENT DENSITY ON MORPHOLOGY AND SURFACE - ENHANCED RAMAN SCATTERING PROPERTIES OF SILVER NANOPARTICLES ARRAYS FABRICATED BY ELECTROCHEMICAL DEPOSITION
DOI:
https://doi.org/10.51453/2354-1431/2021/544Keywords:
Ag nanoparticles; surface-enhanced Raman scattering; SERS; crystal violet;Abstract
Surface-enhanced Raman scattering (SERS) is an analytical technique that allows the detection of trace amounts of organic and biological molecules. In this technique, the SERS substrate, where the Raman scattering signal of the analyte molecules is to be enhanced, plays a particularly important role. One of the most commonly used SERS substrates is the SERS substrate made of silver nanoparticles (AgNPs) immobilized on a solid substrate. Typically AgNPs arrays are fabricated by electroless deposition, in this report we present the fabrication of AgNPs arrays on a silicon surface by electrochemical deposition method. Results showed that this method allows the creation of an array of silver nanoparticles which are relatively uniform in size, morphology, as well as the distance between the particles. Moreover, the size and the density of the AgNPs can be controlled by changing the electrochemical current density. To test the performance of the SERS substrate, AgNPs arrays were used as SERS substrates for detecting traces of crystal violet (CV). The results showed that the intensity of the SERS signal depends strongly on the size of the AgNPs, and the distance between them. With optimal AgNPs arrays, we have recorded a SERS spectrum of CV at concentrations below 0.1 ppb.
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