Chinese Optics Letters, Vol. 3, Issue 5, 05287 (2005)
Preparation of nanodiamonds by laser irradiation of graphite
Jing Sun, Yiwen Lei*, Qi Zhai, Xing Yang, Jing Yang, and Xiwen Du
- School of Materials Science and Engineering, Tianjin University, Tianjin 300072
Graphite powders were irradiated by pulsed laser at room temperature and normal pressure and then boiled in perchloric acid. Samples were characterized by high-resolution transmission electron microscopy (HRTEM), electron diffraction pattern (EDP), X-ray diffraction (XRD) pattern, and Raman spectroscopy. The analyses on the HRTEM images, EDP, and XRD show that the diamond particles with a size of about 5 nm are obtained. The shifting and broadening of the diamond peak in Raman spectrum indicate that there are high defect density and residual internal stress in synthetic diamond.