本實驗以二階段式化學法合成Ag@TiO2核殼奈米顆粒結構，熱輔助光還原法合成Ag顆粒，化學還原法製備TiO2殼層。以X光繞射儀、掃描式電子顯微鏡、穿透式電子顯微鏡，及X光吸收光譜分析樣品成分、形貌、結構與價態之改變。研究結果顯示，化學還原法可以成功合成TiO2奈米顆粒，但在高濃度(8mM)的時候，會有前驅物之殘留。Ag@TiO2核殼奈米顆粒結構也成功利用化學還原法製備，殼層厚度隨著Ti濃度上升而上升。Raman分析顯示形成核殼結構缺陷有明顯的增加，XAS分析則顯示Ag@TiO2樣品中Ti3+隨著TiO2濃度增加而提高。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 study, Ag@TiO2 core-shell nanoparticles (NPs) by two-step method. Ag nanoparticles was prepared by thermal assisted photoreduction method (TAP), and then covered by TiO2 NPs which were obtained by chemical reduction method. The morphology, crystallinity, and electronic structure of NPs were characterized by using X-ray diffraction (XRD), Transmission electron microscopy (TEM), Raman and X-ray absorption spectroscopy (XAS). Our results first showed that TiO2 NPs could be synthesized by chemical reduction method. However, residual precursor was observed as the concentration of precursor reached 4mM. Second, Ag@TiO2 core-shell NPs were synthesized successfully by two step reduction method. Shell thickness can be controlled easily by adjusting the concentration of precursor. It is also demonstrated that defects, including oxygen vacancy and Ti3+, were introduced after the formation of core shell structure. At last, enhanced room temperature ferromagnetism was observed of Ag@TiO2 core-shell NPs.　

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