本文介绍了一种制备多功能磁性Fe2O3/Au/Ag纳米粒子的简捷方法, 制备的粒子直径大约在100 nm左右, 采用UV-vis和SEM对该结构进行了表征。并通过调节硝酸银的用量, 制备了一系列具有不同壳层厚度和表面结构的多重核壳纳米粒子。以苯硫酚(TP)为探针分子, 研究了不同银壳厚度的磁性纳米粒子的表面增强拉曼散射(SERS)活性。结果表明随Ag:Au比例的不断增加, 其SERS活性呈现先增大后减小的趋势, 这与表面结构的改变有关。

A facile approach was developed to fabricate novel multifunctional magnetic Fe2O3/Au/Ag nanostructures with the diameter of about 100 nm. The nanoparticles were characterized by UV-vis and SEM. The Fe2O3/Au/Ag hybrid nanoparticles with different Ag shell thickness were prepared by adjusting the amount of the AgNO3. By using thiophenol (TP) as probe molecule, the surface enhanced Raman scattering (SERS) effect was examined on different magnetic core multi-shell nanoparticles. The results revealed that the SERS intensity was dependent upon the molar ratio of n (Ag) : n (Au). With the increase of the Ag fractions, the SERS activity was enhanced firstly and followed with a decrease procedure. It was mainly contributed by the different surface structure of the core-shell nanoparticles.