| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
2024 Graduate Student Poster Contest
|
| Presentation Title |
SPG-63: X-Ray Diffraction Analysis of the Effect of Hydrogen and Methane Partial Pressures on the Chemical Vapor Deposition Synthesis of Refractory Metal Carbides |
| Author(s) |
Jesus Acosta, Phillisity Neal, Sajjad Hasan, Eric Payton |
| On-Site Speaker (Planned) |
Sajjad Hasan |
| Abstract Scope |
MXenes (functionalized transition metal carbides or nitrides) are promising materials for many applications including photocatalysis, energy storage and electrocatalysis. In this work, liquid phase chemical vapor deposition (CVD) was used to synthesize refractory metal carbide MXene precursors, as an alternative to top-down etching process. The change of partial pressures of H<sub>2</sub> and CH<sub>4</sub> control the stoichiometry for the formation of 2D carbide crystals, but the optimal ratios are not easily predicted from available data in the literature. In this work, a thermodynamic analysis is used to guide an experimental study into effective conditions for producing thin carbide crystals of M<sub>x+1</sub>C<sub>x</sub> stoichiometry. Rietveld refinement is applied to X-ray diffraction data to investigate the synthesis products from a variety of different CVD conditions, elucidating effective parameters and limitations of bottom-up processing routes for MXenes. |