| Summary: | 碩士 === 南台科技大學 === 奈米科技研究所 === 97 === Here, we present the synthesis of variable-sized CuCr2Se4 nanoparticles and study their magnetic properties. CuCr2Se4 is known to be a metallic ferromagnet with a Curie temperature of 430 K and displays a large magneto-optical effect at room temperature. This compound has been theoretically predicted to be highly spin polarized, thus making it a candidate material for new spin-based electronic devices. Here, we present the synthesis of variable-sized CuCr2Se4 nanoparticles and study their magnetic properties. We synthesized CuCr2Se4 nanoparticles through thermal decomposition of the mixture of metal-oleylamine and selenium-oleylamine complexes in a three-neck flask equipped with an inlet of argon gas, condenser, magnetic stirrer, thermocouple, and heating mantle. The crystal structure and phase purity of the samples were examined using Xray powder diffraction (XRD). The particle shape and size of samples were observed by the transmission electron microscope. Magnetic properties were analyzed using vibrating sample magnetometer. XRD patterns show that the as-synthesized nanocrystals have the cubic spinel structure.
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