Publications (4)52.46 Total impact
-
Article: One-nanometer-scale size-controlled synthesis of monodisperse magnetic iron oxide nanoparticles.
Angewandte Chemie International Edition 04/2005; 44(19):2873-7. · 13.45 Impact Factor -
Article: Synthesis of monodisperse chromium nanoparticles from the thermolysis of a Fischer carbene complex.
[show abstract] [hide abstract]
ABSTRACT: We successfully synthesized monodisperse chromium nanoparticles from the thermolysis of a Fischer carbene complex.Chemical Communications 02/2005; · 6.17 Impact Factor -
Article: Ultra-large-scale syntheses of monodisperse nanocrystals.
[show abstract] [hide abstract]
ABSTRACT: The development of nanocrystals has been intensively pursued, not only for their fundamental scientific interest, but also for many technological applications. The synthesis of monodisperse nanocrystals (size variation <5%) is of key importance, because the properties of these nanocrystals depend strongly on their dimensions. For example, the colour sharpness of semiconductor nanocrystal-based optical devices is strongly dependent on the uniformity of the nanocrystals, and monodisperse magnetic nanocrystals are critical for the next-generation multi-terabit magnetic storage media. For these monodisperse nanocrystals to be used, an economical mass-production method needs to be developed. Unfortunately, however, in most syntheses reported so far, only sub-gram quantities of monodisperse nanocrystals were produced. Uniform-sized nanocrystals of CdSe (refs 10,11) and Au (refs 12,13) have been produced using colloidal chemical synthetic procedures. In addition, monodisperse magnetic nanocrystals such as Fe (refs 14,15), Co (refs 16-18), gamma-Fe(2)O(3) (refs 19,20), and Fe(3)O(4) (refs 21,22) have been synthesized by using various synthetic methods. Here, we report on the ultra-large-scale synthesis of monodisperse nanocrystals using inexpensive and non-toxic metal salts as reactants. We were able to synthesize as much as 40 g of monodisperse nanocrystals in a single reaction, without a size-sorting process. Moreover, the particle size could be controlled simply by varying the experimental conditions. The current synthetic procedure is very general and nanocrystals of many transition metal oxides were successfully synthesized using a very similar procedure.Nature Material 12/2004; 3(12):891-5. · 32.84 Impact Factor -
Article: Synthesis, Characterization, and Magnetic Properties of Uniform-sized MnO Nanospheres and Nanorods
[show abstract] [hide abstract]
ABSTRACT: Uniform-sized MnO nanospheres and nanorods were fabricated by the thermal decomposition of Mn−surfactant complexes. The particle sizes of the nanospheres were varied from 5 to 40 nm by changing the surfactant. The shape of the particles could be controlled by varying the experimental conditions. The synthesized MnO nanorods have diameters ranging from 7 to 10 nm, and lengths ranging from 30 to 140 nm. Structural characterization using X-ray powder diffraction, X-ray absorption spectroscopy, and high-resolution transmission electron microscopy revealed that the nanoparticles are core/shell structures with a MnO core and a thin Mn3O4 shell. The MnO nanoparticles exhibited very interesting magnetic properties. For example, the MnO nanorods with dimensions of 7 nm × 33 nm showed two blocking temperatures at 35 and 280 K, respectively.08/2004;
Top co-authors
Top Journals
Institutions
-
2004–2005
-
Seoul National University
- School of Chemical and Biological Engineering
Seoul, Seoul, South Korea
-
