functionalized nanocomposites of gold and their optical studies

Post-functionalization strategy on gold nanoparticles (au nps) surface provides access to novel nanocomposite materials with specific physico-chemical properties for a variety of interdisciplinary applications. in this work, functionalized gold nanocomposites (au ncs) with unique morphological features were achieved by utilizing ruthenium(ii)-polypyridyl complexes with various functional groups. they were synthesized by using ethanol/water medium at room temperature by place-exchange methodology. as the progress of binding ru(ii)-polypyridyl complex molecules, changed from ionic to covalent fashion, then ru(ii)-polypyridyl complex molecules-induced self-assembly was observed. this was evident in uv-vis spectroscopic and tem studies. additionally, ru(ii)-polypyridyl complexes binding showed altered au nps surface with sers enhancement at micromolar concentration level and raman scattering signals of au surface-bound ru(ii)-polypyridyl complexes were studied through a hot spot mechanism.