本研究以二階段式化學法合成Ag@CeO2核殼結構奈米顆粒，Ag奈米核以熱輔助光還原法(TAP)，CeO2殼層則由熱裂解及化學還原法製備。樣品的成份、形貌、結構及價態以X光繞射儀(XRD)、掃描式電子顯微鏡(SEM)、穿透式電子顯微鏡(TEM)，及X光吸收光譜(X-ray Absorption Spectroscopy，XAS)進行分析。研究結果顯示，化學還原法可成功將CeO2均勻包覆於Ag核上，但當Ag核尺寸小於20 nm，則無法形成核殼結構，XAS分析則顯示樣品中的氧空缺(Vo)與Ce3+隨著Ag和CeO2界面面積提高而增加，顯示在界面處的缺陷數量較多。本實驗進一步控制CeO2的起始濃度，使得殼層厚度下降，進而使界面面積比例上升，達到控制缺陷的目的。磁性量測結果指出具此種核殼結構之奈米顆粒，室溫鐵磁性可大幅提升。

In this research, Ag@CeO2 core-shell structure nanoparticles(NPs) were synthesized by two-step method. Ag NPs was prepared by thermal assisted photoreduction (TAP) method, and CeO2 NPs was prepared by thermal decomposition and chemical reduction(CR) method. X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), and X-ray absorption spectroscopy (XAS) were utilizes to investigate the morphology、structure and valence state of particles. Our results showed that Ag@CeO2 core-shell NPs can be synthesized successfully by CR. However, it is noted that core-shell structure can not be found as the size of Ag core is smaller than 20 nm. XAS analysis demonstrated that the formation of Ag-CeO2 interface result in the enhancement of Vo and Ce3+. With adjusting the shell thickness, the ratio of interface/surface can be further increased. In addition, magnetic measurement indicated that NPs with core-shell structure are ferromagnetic at room temperature. Importantly, the saturation magnetization was much higher than those without core-shell structure.

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