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    STUDIA PHYSICA - Issue no. 2 / 2009  
         
  Article:   FORMATION OF GOLD NANOPARTICLE AGGREGATES BY CHEMICAL CROSS-LINKING: UV-VISIBLE SPECTROSCOPY AND SURFACE-ENHANCED RAMAN SCATTERING STUDIES.

Authors:  MILOHUM MIKESOKPO DZAGLI, SANDA BOCA, MESSANH AGBEKO MOHOU. 		 
       
         
  Abstract:  Gold has a high affinity to thiol groups (SH) in molecules, leading to the formation of molecular self-assembled layers on the metal surface. In this study, we investigate by UV-visible spectroscopy the modification of optical properties of gold nanoparticle (GNPs) as result of their cross-linking induced by chemical interaction with a dithiolated, bifunctional molecule, here 1,3-propanedithiol (1,3-PDT). The chemical binding of GNPs via 1,3-PDT and formation of molecular layers on gold surface was studied by Surface-Enhanced Raman Scattering (SERS). Correlations between plasmons resonances and nanometer-scale morphology were devised by atomic force microscopy (AFM). The cross-linking of nanoparticles is an important step toward developing plasmonic substrate for biosensing based on metallic networks and nanowires.

Keywords: SERS, gold nanoparticles, self-assembly, dithiol, nanocomposites 		 
         
     
         
         
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