title: Synthesis and optical characterizations of chain-like Si@SiSe2 nanowire heterostructures.
abstract: A new type of chain-like Si@SiSe(2) nanowire heterostructures has been successfully synthesized via a one-step Au-catalyzed chemical vapor deposition (CVD) route. The composition and microstructure of the achieved structures were investigated by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM) and micro-Raman spectroscopy. Optical characterization was investigated using a confocal photoluminescent system with an Ar(+) laser (488 nm) as the excitation source. The results reveal that these chain-like structures emit pronounced and broadband red light, even visible with the naked eye at room temperature. A self-organization model was proposed to illustrate the formation of these heterostructures, and the photoluminescent properties were discussed in detail. These new Si-based nanostructures may be helpful for further study of the basic physical properties of SiSe(2) and will find interesting applications in nanophotonic technologies and devices.
authors: College of Physics and Microelectronics Science, Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, Hunan University, Changsha, 410082, China.
authors: Jinyou
authors: J
authors: Xu
authors: Hongxing
authors: H
authors: Li
authors: Xiujuan
authors: X
authors: Zhuang
authors: Qinglin
authors: Q
authors: Zhang
authors: Pengfei
authors: P
authors: Guo
authors: Liang
authors: L
authors: Ma
authors: Anlian
authors: A
authors: Pan
mesh_terms: D002384:Catalysis; D006046:Gold / Q000737:chemistry*; D007834:Lasers; D008027:Light; D053770:Nanowires / Q000737:chemistry* / Q000648:ultrastructure; D012643:Selenium / Q000737:chemistry*; D012825:Silicon / Q000737:chemistry*; D013696:Temperature
chemical_list: D006046:Gold; D012643:Selenium; D012825:Silicon