| Growth Icosahedral Boron Carbide Nanocrystals in DLC Tissue by HFCVD |
| Paper ID : 2259-UFGNSM13-FULL |
| Authors: |
|
Bahrama Mahdavipour, mohammadreza hantehzadeh Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran |
| Abstract: |
| In this research, carbon nanostructures were doped by boron atoms to synthesize icosahedral boron carbide using hot filament chemical vapor deposition (HFCVD) regime. Raman spectroscopy revealed two broad peaks centered on 1334cm-1 and 1573cm-1, the origin of which is sp3 hybrid of disorder (D-band) and sp2 hybrid of graphite (G-band), respectively. These peaks stem from aromatic compounds with sp2 hybrid, demonstrating a local collection of amorphous B4C on the substrate surface. Furthermore, D and G peaks are illustrative of more damage inside the structure. X-ray diffraction (XRD) characterization indicated significant peaks assigned to icosahedral (B13C2) structures in planes (012), (021), and (024). The size of particles was calculated by Debye-scherrer formula at a distance between 8-70 nm. Additionally, the graphite grain size was evaluated by Tuinstra – Koenig formula at a 35-73 nm interval. The decrease observed in the intensity of G and D peaks stem from disrupting the vibrational behavior of the film and diminution of polarizability in the molecules of the lattice so that cause the promotion of a great fraction of δ bonds between B-C atoms. Through cauliflowers morphology observed in FE-SEM images, it could be apparently seen that the increase of boron concentration leads to the augmentation of chain crack on the surface. TEM shows that boron carbide crystals was in DLC tissue and it size was less than 100 nm almost. |
| Keywords: |
| Keywords: Icosahedral.HFCVD,Boron Carbide,Smooth,Cauliflowers |
| Status : Paper Accepted (Poster Presentation) |
© 2010 - 2024 All Rights Reserved. Powered by sinaweb.