Synthesis and field emission properties of Ultra-Nanocrystalline Diamond fibers and helices

M. K. Singh, E. Titus, M. G. Willinger, J. Grácio

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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 languageEnglish
Pages (from-to)2422-2433
Number of pages12
JournalJournal of Nanoscience and Nanotechnology
Volume10
Issue number4
DOIs
StatePublished - Apr 2010
Externally publishedYes

Keywords

  • FIB
  • Fiber
  • Field emission
  • HRTEM
  • Helices
  • MPCVD
  • PEELS
  • UNCD

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