We used 4-mercapto-benzene-diazonium tetrafluoroborate (MBD) molecules as they can chemically adsorb on the gold surface by a covalent Au-S bond. The particles were drop casted onto a clean silicon substrate, followed by the self-assembly of the 4-mercapto-benzenediazonium tetrafluoroborate (MBD) onto the particles' surfaces. This molecule was chemically designed to provide a possibility to attach through the thiol group to the surface of the gold by the Au-S covalent bond, and later we could observe the N2 + leaving due to the plasmonic reactivity. Figure shows the Raman signature of MBD adsorbed on the black gold as compared to the neat molecules. As shown, due to the diazonium moiety, different surface attachment configurations are possible by both the Au-N and Au-C bonds. The normal Raman spectrum of the MBD molecule shows prominent peaks at 1008 cm -1 (monosubstituted aromatic ring breathing mode), 1069 cm -1 (C-H in-plane bending of the aromatic ring), ~1560 cm -1 (C=C stretching and ring deformation), and at 2277 cm -1 (N2 + stretching, not shown here). When the molecules are deposited onto the Black gold films, we observe the appearance of new peaks and the shift of existing peaks due to their chemical adsorption onto the gold surface. Also, the peak for the N2 + stretching around 2200 cm -1 is not observed. Since the diazonium moiety is very reactive, it is possible that the self-assembled MBD molecules are sufficiently close to each other on the gold surface to react with each other and dimerize.