title: Selective synthesis of Fe7Se8 polyhedra with exposed high-index facets and Fe7Se8 nanorods by a solvothermal process in a binary solution and their collective intrinsic properties.
abstract: Fe(7)Se(8) polyhedra with high-index facets and Fe(7)Se(8) nanorods can be selectively synthesized by a solvothermal reaction in a mixed solvent of diethylenetriamine (DETA) and deionized water (DIW). It is found that the morphologies of Fe(7)Se(8) nanocrystals can be effectively controlled by adjusting the volume ratio of DETA and DIW. The unusual polyhedral crystals are bounded by two {001} and twelve {012} facets. The intrinsic properties of Fe(7)Se(8) nanocrystals have been investigated. Magnetic measurements indicate that the obtained polyhedra and nanorods show a weak ferromagnetic ordering at room temperature. In particular, a new photoluminescence emission at 403 nm from the Fe(7)Se(8) nanocrystals has been observed. The described solvothermal reaction in a mixed solvent may be extended to the synthesis of other transition-metal chalcogenide crystals with controlled shape, facets, and structure, which may bring new functionalities.
authors: Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, School of Chemistry & Materials, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
authors: Min-Rui
authors: MR
authors: Gao
authors: Zhao-Yang
authors: ZY
authors: Lin
authors: Jun
authors: J
authors: Jiang
authors: Hong-Bin
authors: HB
authors: Yao
authors: Yong-Ming
authors: YM
authors: Lu
authors: Qiang
authors: Q
authors: Gao
authors: Wei-Tang
authors: WT
authors: Yao
authors: Shu-Hong
authors: SH
authors: Yu