title: Synthesis of metal-semiconductor core-shell nanoparticles using electrochemical surface-limited reactions.
abstract: 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 CdS 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.
authors.affiliation: Department of Chemistry and Biochemistry and Department of Physics, Auburn University, Auburn, Alabama 36849-5312, USA.
authors.forename: Chaokang
authors.initials: C
authors.lastname: Gu
authors.forename: Hui
authors.initials: H
authors.lastname: Xu
authors.forename: Minseo
authors.initials: M
authors.lastname: Park
authors.forename: Curtis
authors.initials: C
authors.lastname: Shannon