Document Server@UHasselt >
Research >
Research publications >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/19152

Title: Highly Conductive Diamond-Graphite Nanohybrid Films with Enhanced Electron Field Emission and Microplasma Illumination Properties
Authors: Saravanan, Adhimoorthy
Huang, Bohr-Ran
Kamatchi Jothiramalingam, Sankaran
Tai, Nyan-Hwa
Lin, I-Nan
Issue Date: 2015
Citation: ACS APPLIED MATERIALS & INTERFACES, 7 (25), p. 14035-14042
Abstract: Bias-enhanced nucleation and growth of diamond-graphite nanohybrid (DGH) films on silicon substrates by microwave plasma enhanced chemical vapor deposition using CH4/N-2 gas mixture is reported herein. It is observed that by controlling the growth time, the microstructure of the DGH films and, thus, the electrical conductivity and the electron field emission (EFE) properties of the films can be manipulated. The films grown for 30 min (DGHB30) possess needle-like geometry, which comprised of a diamond core encased in a sheath of sp(2)-bonded graphitic phase. These films achieved high conductivity of sigma = 900 S/cm and superior EFE properties, namely, low turn-on field of 2.9 V/mu m and high EFE current density of 3.8 mA/cm(2) at an applied field of 6.0 V/mu m. On increasing the growth time to 60 min (the DGH(B60)), the acicular grain growth ceased and formed nanographite clusters or defective diamond clusters (n-diamond). Even though DGH(B60) films possess higher electrical conductivity (s = 1549 S/cm) than the DGHB30 films, the EFE properties degraded. The implication of this result is that higher conductivity by itself does not guarantee better EFE properties. The nanosized diamond grains with needle-like geometry are the most promising ones for the electron emission, exclusively when they are encased in graphene-like layers. The salient feature of such materials with unique granular structure is that their conductivity and EFE properties can be tuned in a wide range, which makes them especially useful in practical applications.
Notes: [Saravanan, Adhimoorthy; Huang, Bohr-Ran] Natl TaiwanUniv Sci & Technol, Grad Inst Electroopt Engn, Taipei 106, Taiwan. [Saravanan, Adhimoorthy; Huang, Bohr-Ran] Natl TaiwanUniv Sci & Technol, Dept Elect Engn, Taipei 106, Taiwan. [Sankaran, Karnatchi Jothiramalingarn; Tai, Nyan-Hwa] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan. [Sankaran, Karnatchi Jothiramalingarn] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Lin, I-Nan] Tamkang Univ, Dept Phys, Tamsui 251, Taiwan.
URI: http://hdl.handle.net/1942/19152
DOI: 10.1021/acsami.5b03166
ISI #: 000357436800037
ISSN: 1944-8244
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

Files in This Item:

Description SizeFormat
N/A6.9 MBAdobe PDF

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.