Abstract
We propose a novel template method for large scale synthesis of Ultra-Nanocrystalline Diamond (UNCD) fibres and helices with lengths of thousands of microns and diameters ranging from 0.5 to 5 μm: (i) Large quantities of submicrometer- or nanometer-diameter silica (a-SiO 2) nanostructures, with lengths in the order of 2 to 4 mm, were synthesized by Vapor-Liquid-Solid (VLS) method; (ii) UNCD coating of as-synthesized a-SiO 2 micro- or nanonanostructures by Microwave Plasma Chemical Vapour Deposition (MPCVD) technique in hydrogen-deficient condition. Electron Field Emission (EFE) of as-synthesized UNCD structures was observed with a threshold field of 3.4 V/μm. These micro- or nanostructures may find potential applications in high power electronics, vertical field-effect transistors in vacuum electronics, heat sinks in microelectronics and structural materials in Micro- and Nano-Electro-Mechanical Systems (MEMS/NEMS). The successful preparation of various types of UNCD structures suggests that this templating process can be used for a wide range of materials
Original language | English |
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Pages (from-to) | 2422-2433 |
Number of pages | 12 |
Journal | Journal of Nanoscience and Nanotechnology |
Volume | 10 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2010 |
Externally published | Yes |
Keywords
- FIB
- Fiber
- Field emission
- HRTEM
- Helices
- MPCVD
- PEELS
- UNCD