原位一步法合成Ag/Fe_2O_3磁性核壳纳米粒子

Synthesis of Ag/Fe_2O_3 Core-Shell Composite Nanoparticles by In-situ Method

采用原位法在低温下一步合成Ag/Fe2O3磁性核壳纳米粒子,并采用XRD,TEM和UV光谱研究了Ag-Fe2O3核壳纳米复合材料的结构。结果表明,纳米银粒子表面被Fe2O3层包覆,Ag核的平均粒径大约为35nm,Fe2O3壳层平均厚度约为7.5nm或15nm,形成了核壳结构的电磁复合纳米粒子。在室温下,饱和磁化强度达到0.98(A·m2)·kg-1,矫顽力8.48×103A/m;Ag/Fe2O3核壳粒子的导电率达到0.62S/cm。通过此法可以比较容易的控制核和壳的尺寸以及复合粒子的单分散性,并得到较高的产率,在催化剂、医药、光电等领域有着广阔的应用前景。

The Fe2O3/Ag core-shell composite nanoparticles were prepared via a simple method at low temperature. The structure of Ag-Fe2O3 core-shell composite nanoparticles was confirmed by XRD, TEM and UV spectra. The results show that the size distributions of the Ag nanocomposites averaged 35 nm, with a thickness of 7.5 nm or 15 nm of Ag layer. Magnetic measurements show that the composite nanoparticles exhibited a typical ferromagnetic behavior, a specific saturation magnetization of 0.98 （A＇m/）.kg1 and an intrinsic coercivity of 8.48x 103 A/m at room temperature. The electric conductivity of Fe203/Ag core-shell composite nanoparticles is up to 0.62 S/cm. Through this method can obtain higher yield of Fe2O3/Ag core-shell composite nanoparticles, and this method also can control the size and composite particle dispersion easily. It will have a broad application prospects in catalyst, medicine, photoelectric etc.