Ulster University Logo

Ulster Institutional Repository

Spectroscopic analysis of a-C and a-CNx films prepared by ultrafast high repetition rate pulsed laser deposition

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

McCann, R, Roy, SS, Papakonstantinou, P, McLaughlin, JAD and Ray, SC (2005) Spectroscopic analysis of a-C and a-CNx films prepared by ultrafast high repetition rate pulsed laser deposition. JOURNAL OF APPLIED PHYSICS, 97 (7). pp. 73522-1. [Journal article]

[img]PDF - Published Version
307Kb

URL: http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=JAPIAU000097000007073522000001&idtype=cvips&prog=normal

DOI: 10.1063/1.874300

Abstract

The effect of nitrogen partial pressure on amorphous carbon nitride (a-CNx) (0.0 <= x <= 0.17) and laser fluence on amorphous carbon (a-C) films prepared by ultrafast high repetition rate pulsed laser deposition has been studied. The chemical bonding structure of the films was investigated by x-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and Fourier transform infrared (FTIR) analysis. XPS studies of films revealed an increase in the CN sites at the expense of CC bonded carbon sites as nitrogen content in the films increased. Films (a-C) prepared as a function of laser fluence showed an increase in sp(3)-bonded carbon as laser fluence was increased from 0.36 to 1.7 J/cm(2). The I-D/I-G ratio and G peak position increased as a function of nitrogen whereas the full width at half maximum (FWHM) of the G peak decreased. This is indicative of either an increase in the size or number of the sp(2) sites. Films prepared as a function of laser fluence revealed a decrease of the I-D/I-G ratio and an increase in the FWHM of the G peak. The use of two visible excitation wavelengths when analyzing the samples indicated a esonant process. FTIR analysis revealed an increase in the peaks attributed to C=N bonds as well as indicated a tiny amount of C=N bonds within the nitrogen-doped films. Additionally, surface morphology analysis showed a greater particle density on films prepared at the highest laser energy in comparison to those prepared at lower fluences. Film hardness characterized by nanoindentation revealed that films became softer as a function of nitrogen content. (C) 2005 American Institute of Physics.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:292
Deposited By:Mrs Ann Blair
Deposited On:19 Oct 2009 13:24
Last Modified:15 Jun 2011 10:51

Repository Staff Only: item control page