环糊精功能化的Fe3O4@Au纳米粒子

Fe_3O_4@Au Nanoparticle Modified by Cyclodextrin

制备了Fe3O4@Au纳米粒子,再通过两步法制备了全-6-硫代-β-环糊精,并用自组装法将β-环糊精修饰在纳米粒子表面,获得了环糊精功能化的Fe3O4@Au纳米粒子(Fe3O4@Au-β-CD)。实验发现,外界磁场作用下,复合纳米粒子具有快速响应性能;Fe3O4@Au-β-CD的紫外可见光谱中出现了Au特征吸收峰;透射电镜显示该粒子形貌呈球形,粒径在15.5nm左右;X射线光电子能谱中表明β-CD已修饰到纳米粒子表面;通过分别对比修饰前后Au、S的单谱,可知是β-CD通过Au-S键修饰到Fe3O4@Au表面;Fe3O4@Au-β-CD的红外光谱中出现了β-CD的特征峰,而且巯基吸收峰消失,确证了β-CD修饰到粒子表面;热重分析表明粒子表面β-CD的含量约为26.4%。

Firstly, Fe3O4 @Au nanoparticles were prepared. Then per-6-thiolated-β-cyclodextrins （β-CDs） which were synthesized by a two-step method were modified onto the surface of Fe3O4 @Au nanoparticle through self- assemblization. The as-prepared multi-functional nanoparticles represent a magnetic response under magnet. Fe3O4@Au-β-CD nanoparticles have a similar UV-vis peak as Au nanoparticles. TEM images show that the nanoparticles disperse well and the size of nanoparticles is about 15.5nm. XPS results indictate that β-CDs have been modified onto the surface of Fe3O4@Au nanoparticles through Au-S. FT-IR spectra also show that the characteristic peaks of β-CDs emerge, the absorption peak of thiol disappears, indicating that β-CDs have been modified onto the surface of Fe3O4 @Au nanoparticles successfully. TGA demonstrate the mass fraction of β-CDs in Fe3O4@Au-β-CD nanoparticles is about 26.4 %.