title: Synthesis, characterization and magnetic properties of nearly monodisperse CuCr2Se4 nanoparticles.
abstract: Nearly monodisperse CuCr(2)Se(4) hexagon-shaped nanoparticles with crystallite sizes from 15.1 to 24.3 nm were synthesized by thermal decomposition of metal chlorides and selenium powder in oleylamine. In addition, the 'flower'-shaped CuCr(2)Se(4) nanoparticles with a crystallite size 19.8 nm were also fabricated under similar conditions using heptanoic acid. Magnetic measurements show that all samples reveal ferromagnetic behavior below 350 K. The 'flower'-shaped nanoparticles have saturation magnetization, coercivity and remanent magnetization higher than the hexagon-shaped nanoparticles. However, the Curie temperature of the 'flower'-shaped nanoparticles (approximately 380 K) is somewhat lower than in the hexagon-shaped nanoparticles (420-430 K). These phenomena may be associated with the shape and surface anisotropy which would exert a tremendous influence on the particle's magnetic properties.
authors.affiliation: Institute of Nanotechnology, Department of Mechanical Engineering, Southern Taiwan University, Tainan County, Taiwan, Republic of China. crlin@mail.stut.edu.tw
authors.forename: Chun-Rong
authors.initials: CR
authors.lastname: Lin
authors.forename: Cheng-Lung
authors.initials: CL
authors.lastname: Yeh
authors.forename: Shih-Zong
authors.initials: SZ
authors.lastname: Lu
authors.forename: Igor S
authors.initials: IS
authors.lastname: Lyubutin
authors.forename: Sheng-Chang
authors.initials: SC
authors.lastname: Wang
authors.forename: Igor P
authors.initials: IP
authors.lastname: Suzdalev