Synthesis and Field Emission Properties of Ultra-Nanocrystalline Diamond Fibers and Helices

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 mu m: (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/mu m. 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.

keywords

ULTRANANOCRYSTALLINE DIAMOND; RAMAN-SPECTRA; THIN-FILMS; FABRICATION; ENERGY; CARBON; TEM

subject category

Chemistry; Science & Technology - Other Topics; Materials Science; Physics

authors

Singh, MK; Titus, E; Willinger, MG; Gracio, J

Groups

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".