Effect of O-2(+), H-2(+) + O-2(+), and N-2(+) + O-2(+) ion-beam irradiation on the field emission properties of carbon nanotubes

Author(s)

Acuna, J. J. S. ^[1] ; Escobar, M. ^{[2, 3]} ; Goyanes, S. N. ^[3] ; Candal, R. J. ^{[2, 4]} ; Zanatta, A. R. ^[5] ; Alvarez, F. ^[1]

Affiliation

^[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil

^[2] UBA, CONICET, INQUIMAE, FCEyN, Buenos Aires, DF - Argentina

^[3] UBA, FECyN, Dept Fis, Buenos Aires, DF - Argentina

^[4] UNSAM, ECyT, 3iA, Buenos Aires, DF - Argentina

^[5] Inst Fis Sao Carlos USP, BR-13560250 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Journal of Applied Physics; v. 109, n. 11 JUN 1 2011.
• Web of Science Citations: 5

Abstract

The effect of O-2(+), H-2(+) + O-2(+), and N-2(+) + O-2(+) 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(2)(+)or N-2(+) ons 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. (C) 2011 American Institute of Physics. {[}doi: 10.1063/1.3593269] (AU)

• FAPESP's process: 05/53926-1 - Research and development of new materials of interest in nanotechnology: applications in (micro-) electronics and metal-mechanics industries
• Grantee: Fernando Alvarez
• Support Opportunities: Research Projects - Thematic Grants