fe doped magnetic nanodiamonds made by ion implantation
Use high dose Fe ionimplantation.
Fe atoms are embedded into NDs by Fe ions.
The crystal structure of the injection and NDs is restored by thermal annealing.
The results of TEM and Raman spectra show that the crystal structure of Fe-injected NDs is fully restored. The SQUID-
Fe measurement shows Fe-
The NDs has room temperature magnetic properties.
This means that the Fe atoms are distributed inside the NDs without affecting the crystal structure, so Fe can maintain the original physical and chemical properties of the NDs.
In addition, ion-implantation-
The introduced magnetic properties can make the NDs suitable for various medical applications.
The process of injecting NDs into Fe ions is shown. ND powder (
100 nm, Element Six Co. )
First dissolved in distilled deionic water (DD water).
Then drop the solution on the oxidized silicon wafer and dry under the lamp.
Put the Si sample covered by NDs into the vacuum chamber for ion injection. We use SNICS-II (
National Electronics Corporation)
Ion source that produces Fe ions for FeP cathode injection.
Fe ions with different doses of energy of 72 k were injected into NDs.
The range of Fe ions in diamond is 33. 3u2009nm with 8.
8 nm distortion calculated by SRIM code.
After injection, the sample was annealing for 3 hours at 600 °c in the ambient atmosphere to repair the NDs damage caused during Fe ion injection.
Because Si is stacked on a Si wafer that may have many layers, only a portion of Fe is injected with Fe ions.
The attached NDs are then removed from the Si substrate using an ultrasonic bath of 5 ml DD water.
To clean all the ultrasound, we added another 5 ml DD water to rinse out the ultrasound from the ultrasound bath and store the NDs in the tube.
NDs that receive Fe ions as magnetic must be sorted out using a magnetic filter.
We use magnetic.
Activate the cell classification tool (
Miltenyi Biotec Co. MACS separator)as the filter.
When the ND solution passes through the filter, Fe-doped NDs are attracted by the magnet filter and attached to the adjacent wall.
The attached magnetic NDs are then rinsed out by injecting 2 ml DD water.
Finally, collect and store magnetic NDs in a microcomputer
Centrifuge tube (eppendorf)
Water with 2 ml DD.
Due to the sorted Fe-
The NDs implanted in 2 ml DD water stored in eppendorf are transparent and before we use it for material analysis, we use a centrifuge to precipitate Fe-
Eppendorf ported NDs at the bottom.
NDs samples for Raman measurement were prepared by drop plus 0.
Use a liquid transfer tube to use 2 ml on a 1x1 cm silicon wafer.
The prepared NDs samples can be observed under an optical microscope.
The composition and crystal structure of HRTEM/EDX were studied.
HRTEM/EDS samples were prepared with pure carbon film.
We use the pipettes to draw 2 Micron liters from the bottom of eppendorf and place it directly on the carbon film.
The HRTEM/EDS we use is jeol jem-
The 2800F is equipped with 2 large-area 100mm silicon drift detectors.
Magnetic measurement samples were prepared with a 5 × 7 × Silicon Wafer dropped from the bottom of eppendorf along with a 10 micron liter 2 × ml sorted NDs.
The original NDs we used as all experimental control groups were 0.
02% NDs solution.