博文
磁性尖晶石铁酸盐纳米管和纳米环的合成及生物学应用
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题目：Single-Crystalline MFe2O4 Nanotubes/Nanorings Synthesized by Thermal Transformation Process for
Biological Applications
Author: Hai-Ming. Fan,* Jia-Bao Yi, Yi Yang, Kiang-Wei Kho, Hui-Ru Tan, Ze-Xiang Shen, Jun Ding, Xiao-Wei Sun, Malini Carolene Olivo, Yuan-Ping Feng
摘要：
We report a general thermal transformation approach to synthesize single-crystalline magnetic
transition metal oxides nanotubes/nanorings including magnetite Fe3O4, maghematite alpha-Fe2O3, and ferrites MFe2O4 (M=Co, Mn, Ni, Cu) using hematite alpha-Fe2O3 nanotubes/nanorings template. While the straightforward reduction or reduction-oxides process was employed to produce Fe3O4 and alpha-Fe2O3, the alpha-Fe2O3/M(OH)2 core/shell nanostructure was used as precursor to prepare MFe2O4 nanotubes via MFe2O4-x (0<x<1) intermediate. The transformed ferrites nanocrystals retain the hollow structure and single-crystalline nature of the original templates. However, the crystallographic orientation-relationships of cubic spinel ferrites and trigonal hematite show strong correlation with their morpologies. The hollow-structured MFe2O4 nanocrystals with tunable size, shape, and composition have exhibited unique magnetic properties. Moreover, they have been demonstrated as a highly effective peroxidase mimic catalysts for laboratory immunoassays or as a universal nanocapsules hybridized with luminescent QDs for magnetic separation and optical probe of lung cancer cells, suggesting that these biocompatible magnetic nanotubes/nanorings have great potential in biomedicine and biomagnetic applications.
期刊：ACS Nano. 3, 2798, 2009
简评： 水相直接合成单晶的氧化铁纳米管和纳米环最早为北大Jia, CJ等于2005年报道，通过PO4根离子在氧化铁表面的吸附来控制颗粒的形貌。这种水热合成的途径只能得到反铁磁的alpha相Fe2O3,通过氢气还原可以得到磁性尖晶石结构的四氧化三铁纳米管和纳米环。典型的反尖晶石结构铁酸盐，可以通过调制四面体占位的离子来调节其磁性质，但是水相直接合成铁酸盐纳米管和纳米环非常困难。 本文在alpha氧化铁纳米环和纳米管的基础上扩展合成了不同组分的铁酸盐，丰富的磁学性质。并且展示了一些初步的生物应用。这种方法可以很容易扩展到合成其他氧化物纳米管和纳米环体系。此外其丰富的组分和形貌结构调制的磁性质在未来的纳米生物医学应该有广泛的应用前景。
其他相关论文：
Shape-Controlled Synthesis of Single-Crystalline Fe2O3 Hollow Nanocrystals and Their
Tunable Optical Properties, J. Phys. Chem. C 2009, 113, 9928–9935
https://blog.sciencenet.cn/blog-348897-278306.html
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下一篇：硫醇杂化的ZnO纳米管/纳米线：可调节的界面磁性质
Biological Applications
Author: Hai-Ming. Fan,* Jia-Bao Yi, Yi Yang, Kiang-Wei Kho, Hui-Ru Tan, Ze-Xiang Shen, Jun Ding, Xiao-Wei Sun, Malini Carolene Olivo, Yuan-Ping Feng
摘要：
We report a general thermal transformation approach to synthesize single-crystalline magnetic
transition metal oxides nanotubes/nanorings including magnetite Fe3O4, maghematite alpha-Fe2O3, and ferrites MFe2O4 (M=Co, Mn, Ni, Cu) using hematite alpha-Fe2O3 nanotubes/nanorings template. While the straightforward reduction or reduction-oxides process was employed to produce Fe3O4 and alpha-Fe2O3, the alpha-Fe2O3/M(OH)2 core/shell nanostructure was used as precursor to prepare MFe2O4 nanotubes via MFe2O4-x (0<x<1) intermediate. The transformed ferrites nanocrystals retain the hollow structure and single-crystalline nature of the original templates. However, the crystallographic orientation-relationships of cubic spinel ferrites and trigonal hematite show strong correlation with their morpologies. The hollow-structured MFe2O4 nanocrystals with tunable size, shape, and composition have exhibited unique magnetic properties. Moreover, they have been demonstrated as a highly effective peroxidase mimic catalysts for laboratory immunoassays or as a universal nanocapsules hybridized with luminescent QDs for magnetic separation and optical probe of lung cancer cells, suggesting that these biocompatible magnetic nanotubes/nanorings have great potential in biomedicine and biomagnetic applications.
期刊：ACS Nano. 3, 2798, 2009
简评： 水相直接合成单晶的氧化铁纳米管和纳米环最早为北大Jia, CJ等于2005年报道，通过PO4根离子在氧化铁表面的吸附来控制颗粒的形貌。这种水热合成的途径只能得到反铁磁的alpha相Fe2O3,通过氢气还原可以得到磁性尖晶石结构的四氧化三铁纳米管和纳米环。典型的反尖晶石结构铁酸盐，可以通过调制四面体占位的离子来调节其磁性质，但是水相直接合成铁酸盐纳米管和纳米环非常困难。 本文在alpha氧化铁纳米环和纳米管的基础上扩展合成了不同组分的铁酸盐，丰富的磁学性质。并且展示了一些初步的生物应用。这种方法可以很容易扩展到合成其他氧化物纳米管和纳米环体系。此外其丰富的组分和形貌结构调制的磁性质在未来的纳米生物医学应该有广泛的应用前景。
其他相关论文：
Shape-Controlled Synthesis of Single-Crystalline Fe2O3 Hollow Nanocrystals and Their
Tunable Optical Properties, J. Phys. Chem. C 2009, 113, 9928–9935
https://blog.sciencenet.cn/blog-348897-278306.html
上一篇：博客开通了
下一篇：硫醇杂化的ZnO纳米管/纳米线：可调节的界面磁性质
