title: Enhancement of field emission characteristics of carbon nanotubes on oxidation.
abstract: Vertically aligned multi-walled carbon nanotubes (CNTs) were grown on p-type silicon wafer using thermal chemical vapor deposition process and subsequently treated with oxygen plasma for oxidation. It was observed that the electron field emission (EFE) characteristics are enhanced. It showed that the turn-on electric field (E(TOE)) of CNTs decreased from 0.67 (untreated) to 0.26 V/microm (oxygen treated). Raman spectra showed that the numbers of defects are increased, which are generated by oxygen-treatment, and absorbed molecules on the CNTs are responsible for the enhancement of EFE. Scanning electron microscopy and Transmission electron microscopy images were used to identify the quality and physical changes of the nanotube morphology and surfaces; revealing the evidence of enhancement in the field emission properties after oxygen-plasma treatment.
authors: Nanotechnology and Integrated Bio-Engineering Centre (NIBEC), University of Ulster Jordanstown, Shore Road, Northern Ireland, BT37 0QB, United Kingdom.
authors: Ashish
authors: A
authors: Mathur
authors: Susanta Sinha
authors: SS
authors: Roy
authors: Sekhar Chandra
authors: SC
authors: Ray
authors: Kiran Shankar
authors: KS
authors: Hazra
authors: Jeremy
authors: J
authors: Hamilton
authors: Calum
authors: C
authors: Dickinson
authors: James
authors: J
authors: McLaughlin
authors: Devi Shankar
authors: DS
authors: Misra
mesh_terms: D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D037742:Nanotubes, Carbon; D010084:Oxidation-Reduction; D013059:Spectrum Analysis, Raman
chemical_list: D037742:Nanotubes, Carbon