| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014) | |
| Nanomaterials | Wednesday Sessions |
| Session NM-WeP |
| Session: | Nanomaterials Poster Session |
| Presenter: | Aki Tominaga, Kyushu University, Japan |
| Authors: | A. Tominaga, Kyushu University, Japan H. Naragino, Kyushu University, Japan D. Deguchi, Kyushu Institute of Technology, Japan K. Takeda, Fukuoka Institute of Technology, Japan T. Yoshitake, Kyushu University, Japan |
| Correspondent: | Click to Email |
Nano-sized diamond, such as nanocrystalline diamond (NCD), ultrananocrystalline diamond (UNCD), and diamondoids, is a new nanocarbon. Since it was reported that diamond exhibits strong photoluminescence due to nitrogen-vacancy center and generates defect-induced magnetization, the application of nanodiamonds to drag delivery has received much attention. In order to induce the novel functionalities in diamond, doping should be carried out precisely.
Nano-sized diamond powder has ever been fabricated by detonation, and the doping of foreign elements to the powder has been made mainly by ion implantation. In-situ doping during the formation should enable us to incorporate foreign element atoms into nano-sized diamond, effectively and simply. In this work, we employed a coaxial arc plasma gun for the formation of UNCD powder and demonstrated the in-situ doping of chromium during the formation. A coaxial arc plasma gun (ULVAC APG-1000) equipped with a chromium-blended graphite target was operated in vacuum and hydrogen atmospheres. The head of the gun was pointed at a quartz plate. The distance between the plate and gu head was 15 mm. Quartz plate’s temperatures are 550 ºC. Films that quickly and automatically exfoliated from the plate were gathered, and they were smashed into powder. The XRD pattern of 10 at% Cr doped powdered diamond nanoparticles, measured with 12 keV X-ray at beamline 15 of the SAGA-LS, exhibited obvious peaks due to diamond-111 and 220. The electron diffraction also exhibited the similar results. Chromium K-edge XAFS spectra were measured at beamline 6 of the SAGA-LS (: Kyushu University Beamline). The magnetic properties were measured by a vibrating sample magnetometer and superconducting quantum interference device. The details will be reported in the conference presentation.
This work was partially supported by JSPS KAKENHI Grant Number 26790019, Kazuchika Okura Foundation, and JGC-S scholarship foundation. The experiment using synchorotron radiation were performed at the beamline BL15 of the SAGA Light Source with the approval of the Kyushu Synchrotron Lignt Research Center (Proposal No. 1303019A ). XAFS measurements were performed at Kyushu University Beamline (SAGA-LS /BL06).