Carbon and diamond

Raman spectroscopy is an essential tool in the carbon industry, whether for quality control of diamond-like carbon (DLC) coatings, characterising the structure and chirality of carbon nanotubes, or quantitatively measuring the thickness and oxidation state of graphene and related materials.

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Raman maps of type Ib diamond

The Raman and photoluminescence capabilities of Renishaw's inVia Raman systems are widely used to identify whether diamonds have been artificially treated at high temperature and pressure (known as HPHT treated or GE-POL diamonds) to change their colour and hence value.

The images on the right illustrate the use of Raman imaging for revealing the stress distributions produced when type Ib and type IIb diamonds are impressed at high temperatures by a cubic boron nitride (CBN) indenter.

For quality control functions, Renishaw provide a custom analysis program (CAP), allowing automated data collection with integrated complex spectra analysis followed by a 'pass or fail' output.

Documents for download

 

Raman maps of type Ib diamond

Using Raman spectroscopy to study the effect of boron on the mechanical properties of diamond

Document describing the analysis of high temperature impressions in diamond by Raman depth profiling and mapping.

Adobe acrobat PDF 

[130KB]

Direct image of Si-defect in a diamond film

Raman systems for carbon analysis

One page document detailing Raman analysis of hard disk DLC coatings and diamond films. It also includes information on the advantages of Raman spectroscopy as well as other applications in Carbon technology that the utilisation of Raman benefits.

Adobe acrobat PDF

[263KB]

SEM image of carbon nanotubesA SEM-SCA study of single-wall nanotubes
Application note: Renishaw's structural and chemical analyser for scanning electron microscopes.

Adobe acrobat PDF

[79KB]

 

Selected publications

Temperature-mediated growth of single-walled carbon-nanotube intramolecular junctions (2007), Yagang Yao et al, Nature materials, 6, 283-286

Elimination of D-band in Raman spectra of double wall carbon nanotubes by oxidation (2005), S Osswald et al, Chemical Physics letters, 402, 422-427

Identification of GE POL diamonds: a second step (2000), J L Chalain et al, Journal of Gemmology, 27, 2, 73-78

Detection of GE POL diamonds: a first stage (1999), J P Chalain et al, Revue de Gemmologie A. F. G., 138/139, 30-33

Next steps

Contact us online if you require more information or you have a pricing query, or alternatively you may like to speak directly to your local Renishaw office.