Hybridized nanocrystals, which were composed of polydiacetylene (PDA) nanocrystal as a shell layer and silver nano-particle as a core part, were successfully fabricated by means of the “co-reprecipitation method” and the subsequent UV-irradiation to convert the shell layer of solid-state polymerizable diacetylene into PDA. The hybridized core-shell type structure was investigated using both SEM and TEM observations. Interestingly, the plasmon absorption peak of silver nanoparticle decreased and apparently disappeared during UV-irradiation for solid-state polymerization, while the excitonic absorption peak from π-conjugation of PDA was remarkably red-shifted at the same time, compared with only PDA nanocrystal having the same crystal size as the hybridized nanocrystal. These facts suggest that silver nanoparticle of core part may interact optoelectronically with the shell layer of PDA in hybridized nanocrystals to provide different electron states from the original materials.
