Morphological Evolution of Neodymium Boride Nanostructure Growth by Chemical Vapor Deposition
| Autor: | Gonghua Wang, Chin Li \\'Barry\\' Cheung, Jie Ying Chan, David R. Diercks, Joseph R. Brewer |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Materials science
Scanning electron microscope chemistry.chemical_element Nanotechnology Chemical vapor deposition Neodymium Electron beam physical vapor deposition Surfaces Coatings and Films Electronic Optical and Magnetic Materials Field electron emission chemistry.chemical_compound General Energy Chemical engineering chemistry Transmission electron microscopy Boride sense organs Physical and Theoretical Chemistry Selected area diffraction |
| Zdroj: | The Journal of Physical Chemistry C. 113:10446-10451 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | Nanoscale-driven design of electron emission materials can significantly increase their overall efficiency as cathodes for field-induced electron emission by taking advantage of the field enhancement effect. The refractory nature and low work function (1.6 eV) of neodymium hexaboride (NdB6) suggest that high aspect ratio NdB6 nanostructures are potential candidates as efficient field emission cathodes. Here we report the morphological evolution of one-dimensional neodymium boride nanostructures synthesized using palladium-nanoparticle-catalyzed chemical vapor deposition as a function of reaction temperature. Scanning electron microscopy data show that judicious choices of reaction temperatures (795−940 °C) can lead to the preferential growth of curly nanowires or high aspect ratio nanowires. Transmission electron microscopy and selected area electron diffraction reveal that the crystallinity of these nanostructures changes from amorphous, to polycrystalline, to single crystalline as the reaction temperatu... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|