title: Synthesis, surface modification, and multilayer construction of mixed-monolayer-protected CdS nanoparticles.
abstract: Herein, we describe a study aimed at synthesizing mixed-monolayer-protected CdS nanoparticles and investigating the reactivity of surface-bound functional groups in order to facilitate the immobilization of nanoparticles on a solid substrate as well as the construction of a three-dimensional nanocomposite. CdS nanoparticles initially prepared by the reverse micelle method were used to modify nanoparticle surfaces with 1-decanethiol molecules by ligand exchange. Subsequently, 11-mercapto-1-undecanol was partially incorporated by a place exchange reaction, thereby providing stable, mixed-monolayer-protected CdS nanoparticles. The nanoparticles obtained at each step were characterized by FT-IR and UV-vis spectroscopy, transmission electron microscopy, and elemental analysis. The reactivity of surface hydroxyl groups was verified by a reaction with isocyanate-bearing molecules that provide carbamate bonds in high yields at ambient temperature. The obtained mixed-monolayer-protected nanoparticles were also successfully immobilized on a glass substrate through a carbamate-bond-forming reaction that could be further utilized for multilayer construction in a layer-by-layer fashion.
authors.affiliation: Graduate School of Science and Faculty of Science and Engineering, Konan University, 8-9-1 Okamoto, Higashinada, Kobe 658-8501, Japan.
authors.forename: Takaaki
authors.initials: T
authors.lastname: Tsuruoka
authors.forename: Kensuke
authors.initials: K
authors.lastname: Akamatsu
authors.forename: Hidemi
authors.initials: H
authors.lastname: Nawafune
mesh_terms: D019187:Cadmium Compounds / Q000138:chemical synthesis / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D008567:Membranes, Artificial; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D013440:Sulfides / Q000138:chemical synthesis / Q000737:chemistry; D013499:Surface Properties
chemical_list: D019187:Cadmium Compounds; D008567:Membranes, Artificial; D013440:Sulfides; C034939:cadmium sulfide