论文部分内容阅读
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 Ag / Fe2O3 magnetic core-shell nanoparticles were synthesized by in-situ method at low temperature. The structure of Ag-Fe2O3 core-shell nanocomposites was investigated by XRD, TEM and UV spectroscopy. The results show that the surface of the nano-silver particles is coated with a Fe2O3 layer, the average particle diameter of the Ag core is about 35 nm, and the average thickness of the Fe2O3 shell is about 7.5 nm or 15 nm, thereby forming the electromagnetic composite nano-particles with the core-shell structure. The saturation magnetization reaches 0.98 (A · m2) · kg-1 and the coercive force is 8.48 × 103A / m at room temperature. The conductivity of Ag / Fe2O3 core-shell particles reaches 0.62S / cm. By this method, the size of the core and the shell and the monodispersity of the composite particles can be relatively easily controlled, and the high yield can be obtained, which has broad application prospects in the fields of catalysts, medicine, optoelectronics and the like.