title: Tin Ion Directed Morphology Evolution of Copper Sulfide Nanoparticles and Tuning of Their Plasmonic Properties via Phase Conversion.
abstract: Copper-deficient copper sulfide (Cu2-xS) nanoparticles (NPs) have been investigated as important hole-based plasmonic materials because of their size, morphology, and carrier density-dependent localized surface plasmon resonance (LSPR) properties. Morphology and carrier density are two important parameters to determine their LSPR properties. Here, we demonstrate that the foreign metal ion, Sn(4+), directs the growth of djurleite Cu31S16 from nanodisk to tetradecahedron along the [100] direction. To control the LSPR properties by tuning the carrier density, the djurleite Cu31S16 nanoparticles were pseudomorphically converted into more copper-deficient (higher carrier density) roxbyite Cu7S4 NPs by heat treatment in the presence of amine. The roxbyite Cu7S4 NPs exhibited a shorter and stronger LSPR peak while retaining the morphology of the djurleite Cu31S16 NPs.
authors.forename: Lihui
authors.initials: L
authors.lastname: Chen
authors.affiliation: PRESTO, Japan Science and Technology Agency , Gokasho, Uji, Kyoto 611-0041, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Sakamoto
authors.forename: Mitsutaka
authors.initials: M
authors.lastname: Haruta
authors.forename: Takashi
authors.initials: T
authors.lastname: Nemoto
authors.forename: Ryota
authors.initials: R
authors.lastname: Sato
authors.forename: Hiroki
authors.initials: H
authors.lastname: Kurata
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Teranishi