Effect of O{sub 2}{sup +}, H{sub 2}{sup +}+ O{sub 2}{sup +}, and N{sub 2}{sup +}+ O{sub 2}{sup +} ion-beam irradiation on the field emission properties of carbon nanotubes

• Published in: Journal of applied physics Vol. 109; no. 11
• Main Authors: Acuna, J. J. S., Alvarez, F., Escobar, M., Depto. Fisica, FECyN, UBA, Ciudad Universitaria, Pabellon II, Buenos Aires, Goyanes, S. N., Candal, R. J., ECyT, 3iA, UNSAM, Campus Migueletes, San Martin, Pcia. Buenos Aires, Zanatta, A. R.
• Format: Journal Article
• Language: English
• Published: United States 01.06.2011
• Subjects: BEAMS; CARBON; CHALCOGENIDES; CHARGED PARTICLES; ELECTRON EMISSION; ELECTRON MICROSCOPY; ELECTRON SPECTROSCOPY; ELEMENTS; EMISSION; FIELD EMISSION; FUNCTIONS; HYDROGEN; HYDROGEN COMPOUNDS; ION BEAMS; IONS; MICROSCOPY; MOLECULAR IONS; NANOSCIENCE AND NANOTECHNOLOGY; NANOSTRUCTURES; NANOTUBES; NITRIDES; NITROGEN COMPOUNDS; NITROGEN OXIDES; NONMETALS; OXIDES; OXYGEN; OXYGEN COMPOUNDS; PHOTOELECTRON SPECTROSCOPY; PHYSICAL RADIATION EFFECTS; PNICTIDES; RADIATION EFFECTS; RAMAN EFFECT; RAMAN SPECTRA; SCANNING ELECTRON MICROSCOPY; SEMIMETALS; SILICON; SPECTRA; SPECTROSCOPY; SUBSTRATES; THIN FILMS; TITANIUM COMPOUNDS; TITANIUM NITRIDES; TRANSITION ELEMENT COMPOUNDS; WATER; WORK FUNCTIONS; X-RAY PHOTOELECTRON SPECTROSCOPY
• ISSN: 0021-8979; 1089-7550
• DOI: 10.1063/1.3593269

The effect of O{sub 2}{sup +}, H{sub 2}{sup +}+ O{sub 2}{sup +}, and N{sub 2}{sup +}+ O{sub 2}{sup +} ion-beam irradiation of carbon nanotubes (CNTs) films on the chemical and electronic properties of the material is reported. The CNTs were grown by the chemical vapor deposition technique (CVD) on silicon TiN coated substrates previously decorated with Ni particles. The Ni decoration and TiN coating were successively deposited by ion-beam assisted deposition (IBAD) and afterwards the nanotubes were grown. The whole deposition procedure was performed in situ as well as the study of the effect of ion-beam irradiation on the CNTs by x-ray photoelectron spectroscopy (XPS). Raman scattering, field-effect emission gun scanning electron microscopy (FEG-SEM), and field emission (FE) measurements were performed ex situ. The experimental data show that: (a) the presence of either H{sub 2}{sup +} or N{sub 2}{sup +} ions in the irradiation beam determines the oxygen concentration remaining in the samples as well as the studied structural characteristics; (b) due to the experimental conditions used in the study, no morphological changes have been observed after irradiation of the CNTs; (c) the FE experiments indicate that the electron emission from the CNTs follows the Fowler-Nordheim model, and it is dependent on the oxygen concentration remaining in the samples; and (d) in association with FE results, the XPS data suggest that the formation of terminal quinone groups decreases the CNTs work function of the material.