本論文主要係於鐵金屬微粒表面被覆一層銀金屬奈米薄膜，以製得同時具有電性與磁性損失效果之核殼型金屬複合微粒，也同時具有防止鐵金屬表面氧化的保護效果。關於銀金屬奈米薄膜的被覆程度，評估微乳化、多元醇、及無電鍍等三種方法。經由TEM及XPS分析顯示，以無電鍍法配合使用乙二醇為溶劑所製備出的Fe@Ag複合微粒，其表面銀奈米層的覆蓋率與均勻性較佳。以此複合法進一步製備具不同銀被覆量之兩種鐵微粉(R-2521 & IF-029)的Fe@Ag複合微粒，發現其表面銀奈米層的緻密性與被覆量皆隨著被覆次數增加而增加。由R-2521型鐵微粉製得之複合微粒，當銀的被覆次數增至第5次時，表面會有長短不一的銀奈米棒形成。值得注意得，IF-029類型之鐵微粒在表面吸附有油酸分子情況下，有助於銀奈米層的被覆。利用TGA分析Fe@Ag複合微粒的熱重變化，結果顯示被覆完整的銀奈米層確實有助於提昇鐵微粉的抗氧化性。以IF-029型鐵微粉為例，隨著銀被覆量由0wt%增加至10.5wt%，其氧化溫度約由300℃明顯提高至約450℃。電磁遮蔽的檢測結果顯示，R-2521型之Fe@Ag複合微粒的電磁遮蔽效率及頻率範圍並未因銀的被覆而有明顯改變；但IF-029型Fe@Ag複合微粒之遮蔽效率及頻率範圍則似與Ag的被覆量有關。此外，本論文也在水溶液系統中，以傳統無電鍍法於中空玻璃微球表面被覆一層緻密且均勻的銀奈米薄層，製得中空SiO2@Ag複合微粒。同時，也在無敏化/活化情況下，以無電鍍法直接於鐵氧磁粉表面被覆銀奈米層，製得Ferrite@Ag複合微粒，銀的被覆量則隨銀濃度的增加而增加。

　　In this thesis, Fe-core/Ag-shell composite micro-particles were prepared for large electric and magnetic losses. The thin Ag nanoshells not only increased the conductivity but also protect the iron powders from oxidation. Three methods were evaluated for the fabrication of Ag nanoshells on the iron powders：(1) microemulsion technique, (2) polyol process, (3) electroless plating method. From the analyses of TEM and XPS, it was found that the combination of polyol process and electroless plating method gave a better coating of Ag nanoparticles on the surface of iron powders. Using the combined method, two types of Fe@Ag composite micro-particles (R-2521&IF-029) were prepared. The repeated coating increased the surface coverage and the Ag amount coated. For R-2521 type, Ag nanorods with different lengths were formed on the particle surface when the coating number was above 5. It was noteworthy that, for IF-029 type, the oleic acid adsorbed on the powder surface facilitated the coating of Ag nanoshells. The thermogravietric analysis (TGA) revealed that the anti-oxidation property of iron powders was significantly enhanced by the complete coating of Ag nano-shells. For IF-029 type, the oxidation temperature of composite powders with 10.5wt% Ag was raised largely from 300 to 450℃. For R-2521 type, the shielding effectiveness (SE) was not significantly affected by the coating of Ag. But for IF-029, the SE seemed to be affected by the Ag amount coated. In addition, the complete coating of Ag nanoshells on the surface of hollow glass micro-spheres was also achieved using the conventional electroless plating method. Without sensitization and activation, ferrite@Ag composites powders were also prepared by electroless plating method.

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