tailieunhanh - Báo cáo hóa học: " Bi-Functional Silica Nanoparticles Doped with Iron Oxide and CdTe Prepared by a Facile Method"

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: Bi-Functional Silica Nanoparticles Doped with Iron Oxide and CdTe Prepared by a Facile Method | Nanoscale Res Lett 2009 4 640-645 DOI S11671-009-9295-9 NANO EXPRESS Bi-Functional Silica Nanoparticles Doped with Iron Oxide and CdTe Prepared by a Facile Method Cuiling Ren Jiefang Sun Jinhua Li Xingguo Chen Zhide Hu Desheng Xue Received 15 December 2008 Accepted 5 March 2009 Published online 20 March 2009 to the authors 2009 Abstract Cadmium telluride CdTe and iron oxide nanoparticles doped silica nanospheres were prepared by a multistep method. Iron oxide nanoparticles were first coated with silica and then modified with amino group. Thereafter CdTe nanoparticles were assembled on the particle surfaces by their strong interaction with amino group. Finally an outer silica shell was deposited. The final products were characterized by X-ray powder diffraction transmission electron microscopy vibration sample magnetometer photoluminescence spectra Fourier transform infrared spectra FT-IR and fluorescent microscopy. The characterization results showed that the final nanomaterial possessed a saturation magnetization of about emu gand an emission peak at 588 nm when the excitation wavelength fixed at 380 nm. Keywords Iron oxide nanoparticles CdTe Fluorescent Magnetic Preparation Introduction Magnetic nanoparticles offer great potential in biomedical applications including magnetic resonance imaging MRI targeted drug delivery rapid biological separation biosensors and magnetic hyperthermia therapy. Among the C. Ren J. Sun J. Li X. Chen H Z. Hu Department of Chemistry Lanzhou University Lanzhou 730000 People s Republic of China e-mail chenxg@ rencl04@ D. Xue Key Laboratory for Magnetism and Magnetic Materials of MOE Lanzhou University Lanzhou 730000 People s Republic of China magnetic nanomateials iron oxide nanoparticles including Fe3O4 and y-Fe2O3 are by far the most commonly employed material because of their biocompatibility 1-4 . At the same time cadmium telluride CdTe nanoparticles as an important II-VI semiconductor material have .