Issue 6, 2014

Laser-induced graphitization of colloidal nanodiamonds for excellent oxygen reduction reaction

Abstract

Graphitized nanodiamonds were conveniently prepared by the laser irradiation of colloidal solution using various solvents. The nanodiamonds were converted into a fully graphitized onion-like structure, which became a cage-like mesoporous structure by the degradation of graphitic layers. Alcohols, acetone, and acetonitrile are more efficient solvents for the graphitization compared to water and hydrocarbons. Therefore the number and morphology of the graphitic layers can be simply controlled by the solvent and laser-irradiation duration. We suggest a graphitization model, in which the photocatalytic oxidation of the solvent accelerates the graphitization of nanodiamonds. The graphitized nanodiamonds were easily doped with the nitrogen and sulfur atoms in a controlled manner. In particular, the spherical graphitic layers were preferentially doped with the pyrrolic nitrogen that enhances remarkably electrocatalytic activity for the oxygen reduction reaction.

Graphical abstract: Laser-induced graphitization of colloidal nanodiamonds for excellent oxygen reduction reaction

Supplementary files

Article information

Article type
Paper
Submitted
24 Sep 2013
Accepted
29 Nov 2013
First published
29 Nov 2013

Phys. Chem. Chem. Phys., 2014,16, 2411-2416

Laser-induced graphitization of colloidal nanodiamonds for excellent oxygen reduction reaction

D. M. Jang, H. S. Im, S. H. Back, K. Park, Y. R. Lim, C. S. Jung, J. Park and M. Lee, Phys. Chem. Chem. Phys., 2014, 16, 2411 DOI: 10.1039/C3CP54039A

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