Synthesis of Metal-Semiconductor Core-Shell Nanoparticles Using Electrochemical Surface-Limited Reactions

We report the synthesis of Au/CuI and Au/CdS core-shell nanoparticle (NP) thin films using codeposition and electrochemical atomic layer deposition (EC-ALD). Au nanoparticle films were prepared on glassy carbon supports by depositing alternating layers of poly(diallyl dimethylammonium)-stabilized Au nanoparticles and COP(2)W(17)O(61)(8-)polyoxometallate interlayers. From there, CuI was deposited onto the Surface of Au nanoparticles using electrochemical atomic layer deposition, while US films were grown by an atom-by-atom codeposition method. The semiconductor-Au core-shell nanoparticles were characterized by electrochemistry, photoluminescence spectroscopy, and Raman spectroscopy. Our results indicate that the semiconductors deposit onto the AuNP surface by surface limited electrochemical reactions.