Study of CVD diamond layers with amorphous carbon admixture by Raman scattering spectroscopy

Abstract

Raman spectroscopy is a most often used standard technique for characterization of different carbon materials. In this work we present the Raman spectra of polycrystalline diamond layers of different quality, synthesized by Hot Filament Chemical Vapor Deposition method (HF CVD). We show how to use Raman spectroscopy for the analysis of the Raman bands to determine the structure of diamond films as well as the structure of amorphous carbon admixture. Raman spectroscopy has become an important technique for the analysis of CVD diamond films. The first-order diamond Raman peak at ca. 1332 cm −1 is an unambiguous evidence for the presence of diamond phase in the deposited layer. However, the existence of non-diamond carbon components in a CVD diamond layer produces several overlapping peaks in the same wavenumber region as the first order diamond peak. The intensities, wavenumber, full width at half maximum (FWHM) of these bands are dependent on quality of diamond layer which is dependent on the deposition conditions. The aim of the present work is to relate the features of diamond Raman spectra to the features of Raman spectra of non-diamond phase admixture and occurrence of other carbon structures in the obtained diamond thin films.

Diamond-Like Carbon Nanofoam from Low-Temperature Hydrothermal Carbonization of a Sucrose/Naphthalene Precursor Solution

“…It has been well documented that diamond films in Raman spectroscopy show a sharp feature at about 1332 cm −1 [88]. These phonon vibrations involve the sp 3 -hybridized carbon atoms in diamond.…”

“…Diamond-like features of a carbon nanomaterial in Raman spectra can arise mainly from two different sources; either from sp 3 -related vibrations due to small regions of crystalline diamond (usually nanodiamonds) [87], or from regions with amorphous sp 3 -related structures [88]. It has been well documented that diamond films in Raman spectroscopy show a sharp feature at about 1332 cm −1 [88].…”

Bi- tri- and few-layer graphene growth by PLD technique using Ni as catalyst

“…Raman spectroscopy is the most reliable, nondestructive and quick inspection method to get information of graphene and carbon related structures [4]. Fig.…”

“…D band is energy dispersive and a slight shift in its position (if there is any) might depend on the change in the excitation energy [23]. The second prominent Raman peak appearing at 1590 cm −1 is referred to as G band [4]. G band represents the crystalline quality and is an evidence for the formation of hexagonal lattice in graphite.…”

“…It is a two-dimensional building block of carbon allotropes and can be stacked into 3D graphite, rolled into 1D nanotube CNT, or wrapped into 0D fullerenes [1,3]. Variety of different carbon related crystalline and non-crystalline structures may exist in different sp 2 and sp 3 hybridization states [4]. Graphene exhibits unique electronic properties, for instant, high charge carrier mobility and quantum Hall effect [5].…”