Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis of Organic Dye-Impregnated Silica Shell-Coated Iron Oxide Nanoparticles by a New Metho | Nanoscale Res Lett 2008 3 496-501 DOI s11671-008-9186-5 NANO EXPRESS Synthesis of Organic Dye-Impregnated Silica Shell-Coated Iron Oxide Nanoparticles by a New Method Cuiling Ren Jinhua Li Qian Liu Juan Ren Xingguo Chen Zhide Hu Desheng Xue Received 26 August 2008 Accepted 3 October 2008 Published online 23 October 2008 to the authors 2008 Abstract A new method for preparing magnetic iron oxide nanoparticles coated by organic dye-doped silica shell was developed in this article. Iron oxide nanoparticles were first coated with dye-impregnated silica shell by the hydrolysis of hexadecyltrimethoxysilane HTMOS which produced a hydrophobic core for the entrapment of organic dye molecules. Then the particles were coated with a hydrophilic shell by the hydrolysis of tetraethylorthosilicate TEOS which enabled water dispersal of the resulting nanoparticles. The final product was characterized by X-ray diffraction transmission electron microscopy Fourier transform infrared spectroscopy photoluminescence spectroscopy and vibration sample magnetometer. All the characterization results proved the final samples possessed magnetic and fluorescent properties simultaneously. And this new multifunctional nanomaterial possessed high photostability and minimal dye leakage. Keywords Fluorescent Magnetic Nanostructure Synthesis Hydrophobic silane Introduction Recently fluorescent-magnetic bifunctional nanomaterials which are composed of magnetic iron oxide nanoparticles C. Ren J. Li Q. Liu J. Ren X. Chen El Z. Hu Department of Chemistry Lanzhou University Lanzhou 730000 People s Republic of China e-mail chenxg@ D. Xue Key Laboratory for Magnetism and Magnetic Materials of MOE Lanzhou University Lanzhou 730000 People s Republic of China and luminescent dye-doped silica matrix gained more and more attention 1-10 . On the one hand superparamagnetic iron oxide nanoparticles including maghemite y-Fe2O3 and magnetite Fe3O4 were widely investigated for in vivo and in vitro .
