title: Low polydispersed copper-sulfide nanocrystals derived from various Cu-alkyl amine complexes.
abstract: Copper-sulfides, Cu2-xS nanocrystals (NCs) have been synthesized using the reaction between a Cu-alkyl amine complex and a sulfur/1-dodecanethiol. Here, 1-dodecanthiol plays an important role to reduce the reaction temperature of sulfuration. The Cu/S composition (the Cu-defect density) of Cu2-xS NCs depends on the stability of Cu-alkyl amine complex. XPS analyses reveal that the substance of Cu-defect is attributed to an introducing of Cu+2S2-2 species. There is a good correlation between an intensity of a near IR absorption peak and a Cu-defect density estimated by XPS analyses. These results demonstrate that optical properties of Cu2-xS NCs in a near IR region are tunable.
authors.affiliation: Department of Materials Science, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya Aichi 466-8555, Japan. kuzuya@ss.mse.nitech.ac.jp
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Kuzuya
authors.forename: Keiichi
authors.initials: K
authors.lastname: Itoh
authors.forename: Kenji
authors.initials: K
authors.lastname: Sumiyama