In this work, we have demonstrated the application of plasmonic quasi crystal (PlQC) as SERS active substrate. SERS, an offshoot of Raman spectroscopy, is a powerful analytical technique that provides chemical information about molecules or molecular assemblies adsorbed or attached to nanostructured metallic surfaces. We have demonstrated the detection of urea (20μL), up to 10-5 M concentration using PlQC as SERS substrate. Urea, a biomolecule, is irradiated by a laser source (λ=785nm), and Raman spectra are collected using the Raman setup (Renishaw). All Raman peaks of urea were distinctly visible for further analysis. The proposed PlQC can be used as a SERS active substrate for on-site narcoanalysis, forensic study, explosive detection, bio-diagnostics, detection of adulterants in food/water etc.
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