NANO-CRYSTALS OF c-DIAMOND, n-DIAMOND AND i-CARBON GROWN IN CARBON-ION IMPLANTED FUSED QUARTZ
| Autor: | L. A. Bursill, J. L. Peng, J. O. Orwa, Steven Prawer, B. Jiang |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Fused quartz
Materials science Argon Electron energy loss spectroscopy Analytical chemistry chemistry.chemical_element Diamond Statistical and Nonlinear Physics engineering.material Condensed Matter Physics law.invention Field electron emission chemistry law Transmission electron microscopy engineering Selected area diffraction Forming gas |
| Zdroj: | International Journal of Modern Physics B. 15:3107-3123 |
| ISSN: | 1793-6578 0217-9792 |
| Popis: | Combined high-resolution transmission electron microscopy, selected area electron diffraction and parallel electron energy loss spectroscopy are used to characterise carbon nano-phases found embedded in fused quartz. These appear after implantation of 1 MeV carbon ions, followed by annealing in argon, oxygen and forming gas for 1 hour at 1100°C. For Ar, virtually all of the carbon diffuses out of the substrate with no observable carbon clusters for all doses studied. After annealing in oxygen, a crystalline CO x phase is identified at the end of range, following a dose of 5×1017 C/cm 2. Three nano-crystalline carbon phases, including diamond, appear after annealing in forming gas: these form a layer 170 nm beneath the fused quartz surface for all ion doses. The average size of these clusters and the corresponding phases depend on the ion dose; the smallest size of 5–7 nm diameter crystallise as fcc [Formula: see text] diamond following a dose of 0.5× 1017 C/cm 2, whereas clusters of 8–13 nm diameter, for a higher dose of 2× 1017 C/cm 2, have a [Formula: see text] modified phase of diamond known as n-diamond. The largest clusters, diameter 15–40 nm, for a dose of 5× 1017 C/cm 2, have the cubic P2 13 (or P4 232) structure known as i-carbon. These buried layered diamond and diamond-related materials may have applications for field emission and optical waveguide type devices. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|