Formation of Metal-Semiconductor Core-shell Nanoparticles Using Electrochemical Atomic Layer Deposition

摘要

We report the synthesis of CuI coated and CdS coated Au core-shell nanoparticle films using electrochemical atomic layer deposition (EC-ALD). Au nanoparticle thin films were prepared on glassy carbon supports by depositing alternating layers of poly-(diallyl dimethylammonium)-stabilized Au nanoparticles and COP_2W_(17)0_(61)~(8-) polyoxometallate interlayers. CuI was deposited onto the surface of Au nanoparticles using electrochemical atomic layer epitaxy, while CdS films were grown by an atom-by-atom co-deposition technique. The semiconductor-coated nanoparticles were characterized by electrochemistry, photoluminescence spectroscopy, and Raman spectroscopy. Our results indicate that the semiconductors are deposited onto the Au nanoparticles surface by surface limited electrochemical reactions.