12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

Characterization of nitrogen-doped carbon nanospheres using electron magnetic resonance

15 Jul 2011, 09:00


Oral Presentation Track A - Condensed Matter Physics and Material Science CMPMS1


Dr Jonathan Keartland (University of the Witwatersrand)


Carbon nanospheres were produced using two different sets of apparatus in the School of Chemistry at the University of the Witwatersrand. Nitrogen was introduced into the samples using a several sources of nitrogen, including pyridine. Electron magnetic resonance (EMR) was used to characterize a range of samples of varying concentrations of nitrogen at room temperature. The spheres doped with nitrogen show a strong paramagnetic peak at g = 2, indicating that the nitrogen takes up substitutional sites in the carbon matrix. Careful analysis enables us to determine the nitrogen content in each of the samples by integration of the resonance peak, and normalising to the mass of the sample. Comparison with a reference sample allows us the extract the g for each sample. Power saturation experiments show the the relaxation rates of the nitrogen ions are large in all the samples studied.

Level (Hons, MSc, <br> &nbsp; PhD, other)? other
Consider for a student <br> &nbsp; award (Yes / No)? No
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? Yes

Primary author

Dr Jonathan Keartland (University of the Witwatersrand)


Mr Makhosonke Dubazane (University of the Witwatersrand) Mr Vincent Marsicano (University of the Witwatersrand)

Presentation Materials