Structural morphology of amorphous conducting carbon film

Abstract

Amorphous conducting carbon films deposited over quartz substrates were analysed using X-ray diffraction and AFM technique. X-ray diffraction data reveal disorder and roughness in the plane of graphene sheet as compared to that of graphite. This roughness increases with decrease in preparation temperature. The AFM data shows surface roughness of carbon films depending on preparation temperatures. The surface roughness increases with decrease in preparation temperature. Also some nucleating islands were seen on the samples prepared at 900°C, which are not present on the films prepared at 700°C. Detailed analysis of these islands reveals distorted graphitic lattice arrangement. So we believe these islands to be nucleating graphitic. Power spectrum density (PSD) analysis of the carbon surface indicates a transition from the nonlinear growth mode to linear surface-diffusion dominated growth mode resulting in a relatively smoother surface as one moves from low preparation temperature to high preparation temperature. The amorphous carbon films deposited over a rough quartz substrate reveal nucleating diamond like structures. The density of these nucleating diamond like structures was found to be independent of substrate temperature (700-900°C).

Tailoring carbon nanotips in the plasma-assisted chemical vapor deposition: Effect of the process parameters

“…However, extraction of hydrogen described by reactions ͑14͒-͑16͒ requires a significant amount of heat; this may lead to a less significant increase in the surface diffusion rates. The significance of the surface diffusion effect in this temperature range is consistent with the results of Vishwakarma et al 42 When the surface temperature is sufficiently high to maintain reasonably high rates of hydrogen extraction and surface diffusion, high-quality carbon nanostructures are expected. 43 Meanwhile, higher rates of dehydrogenation reactions may lead to a larger number of adsorption sites for the carbonaceous ions; this further enhances the growth of the CNTPs.…”

Correlation of Mechanical Properties with Surface Morphology of Diamond-Like Carbon Films Deposited By Plasma Enhanced Chemical Vapour Deposition Technique

“…It has been observed that the morphology varies with the variation of RF power. Formation of different surface morphologies like circular, granular, linear, and other structures have also been reported by many authors [21][22][23][24]. Formation of different structures depend on the process parameters like bias voltage, gas composition, type of power supply and power used.…”

“…The high internal stress limits the DLC films for various applications. Correlation of internal stress with sp 3 /sp 2 bonded carbon and various properties have been studied by many authors [21][22][23][24]. While the correlation between surface structures and sp 2 /sp 3 bonded carbon has not been investigated extensively.…”

Physical properties of sputtered amorphous carbon coating

“…One of the most predominant defects in the graphite structure is the formation of sp 3 bonds [8][9][10]. The position and intensity of each band (G or D) will determine the characterization of carbon coating [8]. While these bands overlap, in order to determine the band intensity, the spectra are deconvoluted by Lorentzian method.…”

“…The former is related to sp 2 bonds and graphite structure (G band) and the later is related to in-planar defects in graphite structure (D band). One of the most predominant defects in the graphite structure is the formation of sp 3 bonds [8][9][10]. The position and intensity of each band (G or D) will determine the characterization of carbon coating [8].…”