The present invention discloses a highly sensitive plasmonic substrate for the trace level detection of a wide variety of chemicals, biomolecules and a facile fabrication methodology thereof. The present invention plasmonic substrate produces enhanced Raman scattering of the adsorbed analyte materials of interest thereby enabling the trace level sensing through molecular fingerprinting. The developed methodology for the fabrication of SERS substrate involves nanostructuring of the selected materials through abrasive blasting and followed by coating with a nanolayer of coinage metals such as gold, silver, copper or the combinations thereof through thin film processes such as but not limited to thermal evaporation, electroless deposition.