本論文係以熱裂解法合成兼具磁性與螢光特性的鈷-矽複合奈米粒子，並探討其粒徑、結構、組成、磁性、與光學性質。首先製備出矽奈米粒子，然後以其作為晶種，加入含氯化鈷及油酸與油胺的辛醚溶液中，在280 oC下反應3小時，即可形成鈷-矽複合奈米粒子。由穿透式電子顯微鏡(TEM)得知其平均粒徑為8.9+-2.2nm。由X光繞射(XRD)、電子繞射分析、化學分析電子光譜儀(XPS)、及能量分散光譜儀(EDS)得知其結構與組成。由超導量子干涉磁化儀(SQUID)量測其飽和磁化量(Ms)、殘留磁化量(Mr)與矯頑磁力(Hc)，證實接近超順磁性。以紫外光/可見光(UV/Vis)吸收光譜儀與螢光光譜儀(PL)確認此複合奈米粒子具有矽奈米粒子的光學特性，其最大吸收峰約在300 nm，能隙值4.13 eV，且最大放光波長約為350 nm。

In this thesis, the Co-Si composite nanoparticles with magnetic and photoluminescence properties were prepared by thermal decomposition method. Their size, structure, composition, magnetic and optical properties were investigated. Silicon nanoparticles were synthesized as seeds first, and then added into the dioctyl ether solution containing CoCl2, oleic acid and oleyl amine. After reaction at 280oC for 3 h, Co-Si composite nanoparticles were formed. The resultant composite nanoparticles had a mean diameter of 8.9+-2.2nm by the analysis of transmission electron microscopy (TEM). Their structure and composition were characterized by X-ray diffraction (XRD), electron diffraction pattern, energy dispersive spectrometer (EDS), and X-ray photoelectron spectroscopy (XPS). Their saturation magnetization (Ms), remanent magnetization (Mr), and coercivity (Hc) were measured by the superconducting quantum interference device (SQUID) magnetometer, revealing they were nearly superparamagnetic. Furthermore, the analyses of ultraviolet/visible (UV/Vis) and fluorescence (PL) spectra revealed that they remained the optical property of Si nanoparticles. The maximum absorption occurred at about 300 nm, corresponding to the band gap of 4.13 eV, and the maximum emission wavelength was about 350 nm.

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