复合磁性纳米粒子Fe3O4@SiO2-Ag的制备以及在表面增强拉曼光谱中的应用  

Preparation and applications in SERS of Fe3O4@SiO2-Ag magnetic nanoparticles

作　　者：孙丽娟 马可婧 张军伟 彭勇[2,3] SUN Li-juan;MA Ke-jing;ZHANG Jun-wei;PENG Yong(Gansu Environmental Monitoring Center Station,Lanzhou Gansu 730000;School of Physical Science and Technology,Lanzhou University,Lanzhou Gansu 730030;Electron Microscopy Centre of Lanzhou University,Lanzhou University,Lanzhou Gansu 730030,China)

机构地区：[1]甘肃省环境监测中心站,甘肃兰州730000 [2]兰州大学物理科学与技术学院,甘肃兰州730000 [3]兰州大学电镜中心,甘肃兰州730000

出　　处：《电子显微学报》2020年第6期694-701,共8页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.51801087).

摘　　要：磁性Fe3O4纳米粒子具有很多独特的性质,如超顺磁性、小尺寸效应及宏观量子隧道效应等。这些性质使其在磁记录材料、磁流体材料、染料、催化剂和电子材料等方面显示出特殊功能。Ag纳米粒子由于粒径处于纳米尺寸,具有高的表面活性和表面能,显示出优良的催化、光学及抗菌性能。将磁性纳米粒子和Ag纳米粒子两者结合,形成Ag掺杂的Fe3O4磁性纳米粒子,使其既保留了Ag纳米粒子的优良特性,又拥有磁性纳米粒子的独特性质,呈现出巨大的应用潜力。在本文中,利用非电极沉积的方法将Ag纳米粒子沉积在Fe3O4@SiO2磁性纳米微球的表面。通过多种方法表征了Fe3O4@SiO2-Ag磁性复合纳米粒子。同时,制备了Fe3O4@SiO2-Ag磁性复合纳米粒子的SERS衬底,并研究了该衬底对罗丹明6G和结晶紫的SERS活性。实验表明Fe3O4@SiO2-Ag的SERS衬底上罗丹明6G和结晶紫分子的骨架振动峰的RSD值都低于20%,表明该材料作为SERS衬底,其重现性较好,且在磁场作用下可以重复利用。Fe3O4magnetic nanoparticles are of intense interest due to their potential applications in magnetic recording materials,magnetic fluid materials,dyes,catalysis and electronic materials.Ag nanoparticles show excellent properties in catalysis,optics,and antibacterial because of their nanometer size,high surface activity and energy.By incorporating the magnetic nanoparticles and Ag nanoparticles,the formed Ag doped Fe3O4 magnetic nanoparticles possess excellent properties of both Fe3O4 and Ag nanoparticles and exhibit potential applications in various fields.Here,the electroless plating method was used to prepare the [e-mail] measurement methods were employed to confirmed the formation of Fe3O4@SiO2-Ag nanocomposites.Meanwhile,Fe3O4@SiO2-Ag nanoparticles substrate was prepared and their SERS activity was illustrated by rhodamine 6G(R6G)and crystal violet(CV).The results showed that RSDs of the intensity of the carbon skeleton stretching modes for R6G and CV were below 20%,which indicated this SERS substrate is reproducible and recyclable.

关 键 词：磁性纳米粒子 AG纳米粒子 透射电子显微镜 表面增强拉曼光谱 

分 类 号：O6[理学—化学] TB383[一般工业技术—材料科学与工程]