Sustainable Synthesis of Diamond-like Carbon and Giant Carbon Allotropes from Hyperbaric Methanol–Water Mixtures Through the Critical Point
At a Glance
Section titled “At a Glance”| Metadata | Details |
|---|---|
| Publication Date | 2024-12-09 |
| Journal | Journal of Manufacturing and Materials Processing |
| Authors | Mohamad E. Alabdulkarim, Vibhor Thapliyal, James Maxwell |
| Institutions | La Trobe University |
| Citations | 1 |
Abstract
Section titled “Abstract”Freeform carbon fibres were 3D-printed from CH3OH:H2O mixtures using hyperbaric-pressure laser chemical vapour deposition (HP-LCVD). The experiment overlapped a region of known diamond growth, with the objective of depositing diamond-like carbon without the use of plasmas or hot filaments. A high-pressure regime was investigated for the first time through the precursor’s critical point. Seventy-two C-fibres were grown from 13 different CH3OH:H2O mixtures at total pressures between 7.8 and 180 bar. Maximum steady-state axial growth rates of 14 µm/s were observed. Growth near the critical point was suppressed, ostensibly due to thermal diffusion and selective etching. In addition to nanostructured graphite, various carbon allotropes were synthesised at/within the outer surface of the fibres, including diamond-like carbon, graphite polyhedral crystal, and tubular graphite cones. Several allotropes were oversized compared to structures previously reported. Raman spectral pressure-temperature (P-T) maps and a pictorial P-T phase diagram were compiled over a broad range of process conditions. Trends in the Raman ID/IG and I2D/IG intensity ratios were observed and regions of optimal growth for specific allotropes were identified. It is intended that this work provide a basis for others in optimising the growth of specific carbon allotropes from methanol using HP-LCVD and similar CVD processes.
Tech Support
Section titled “Tech Support”Original Source
Section titled “Original Source”References
Section titled “References”- 2012 - Properties of synthetic diamond and graphene nanoplatelet-filled epoxy thin film composites for electronic applications [Crossref]
- 2020 - Metallization of diamond [Crossref]
- 2022 - A concise review of the Raman spectra of carbon allotropes [Crossref]
- 2021 - The structural, mechanical and electronic properties of novel superhard carbon allotropes: Ab initio study [Crossref]
- 2016 - Electronic and optical properties of novel carbon allotropes [Crossref]
- 2009 - Abrasive waterjet cutting of polycrystalline diamond: A preliminary investigation [Crossref]
- 1946 - Elastic constants of diamond
- 2001 - Mechanical properties of diamond films: A comparative study of polycrystalline and smooth fine-grained diamonds by Brillouin light scattering [Crossref]