Abstract
The purpose of this study was to fabricate magnetic nanodiamonds (NDs) using Fe ion implantation. Nanomaterials are being applied to medical diagnosis study and cancer therapy study. Biocompatibility and biological toxicity have been limiting factors as regarding medical application. Thus it would be desirable to find a new method which can resolve these problems. The NDs, a promising non-toxic material, used in this study was type Ib. They were implanted using 72 keV Fe ions at three different dosage. The process of ion implantation probably damages the crystal lattice of NDs. In order to keep completely crystal lattice of Fe ion doped NDs, this study used thermal annealing process at 800 ℃ and 600 ℃. The Raman spectrum showed that annealing process truly recovered the crystal lattice of NDs. The G-band of graphite disappeared and the intensity of diamond peak increased after annealing. The microstructure of Fe ion doped NDs were examined by High Resolution Transmission Electron Microscopy (HRTEM) and these images demonstrated that no defects were found in Fe ion doped NDs. Further, the content of elements in Fe doped NDs can be identified by Energy dispersive X-ray Spectroscopy (EDX) and the quantification of magnetic force can be measured by Superconducting Quantum Interference Device Vibrating Sample Magnetometer (SQUID VSM). The hysteresis loop indicated that this study successfully produced ferromagnetic NDs. The totally final results displayed Fe doped NDs possess same crystal lattice as NDs and magnetism. Theoretically, these magnetic NDs are also a promising non-toxic and good biocompatibility material.