This project investigates the intercalation and photopolymerization of diacetylene chains into diacetylene coated gold nanoparticles as a means of surface modification. Gold nanoparticles with an approximate diameter of 8 nm were initially coated with 10, 12-octadecadiyne thiol. THF solutions of these nanoparticles were equilibrated with 10,12-octadecadiynoic acid to allow for intercalation of the diacetylene chains. The mixture was irradiated with UV light while monitored by UV-Vis spectroscopy. A red shift of the gold plasmon band suggested cross-linking of the gold nanoparticles or polymerization of intercalated diacetylene chains. In the absence of the octadecadiynoic acid the red shift was significantly larger and eventually resulted in precipitation of macroscopic particles, however, in the presence of acid individual nanoparticles seem to remain in solution, suggesting intercalation and photopolymerization. If this were the case, then the particle surface should have been transformed from a hydrophobic alkane surface to a more hydrophilic carboxylic acid surface. Treatment of the surface modified gold nanoparticles with base resulted in a change in the solubility of the particles, while reprotonation reestablishes the original solubility in organic solvents. The effect of solvent polarity on this process has also been investigated.