ACS Nano· 2012Q1
Two-Dimensional Transition Metal Carbides
- 4,676citations
- Q1SCImago
- 2012year
Short summary
Researchers synthesized novel 2D transition metal carbides and carbonitrides, termed MXenes, by etching MAX phase powders with hydrofluoric acid.
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Key points
- Developed a method to synthesize 2D transition metal carbides and carbonitrides (MXenes) from MAX phases using hydrofluoric acid.
- Successfully exfoliated Ti(2)AlC, Ta(4)AlC(3), (Ti(0.5),Nb(0.5))(2)AlC, (V(0.5),Cr(0.5))(3)AlC(2), and Ti(3)AlCN.
- MXenes demonstrate sheet resistances comparable to multilayer graphene.
- Pressed MXene surfaces exhibit hydrophilic behavior based on contact angle measurements.
AI-generated from the title and abstract; the full text is not read.
Abstract
Herein we report on the synthesis of two-dimensional transition metal carbides and carbonitrides by immersing select MAX phase powders in hydrofluoric acid, HF. The MAX phases represent a large (>60 members) family of ternary, layered, machinable transition metal carbides, nitrides, and carbonitrides. Herein we present evidence for the exfoliation of the following MAX phases: Ti(2)AlC, Ta(4)AlC(3), (Ti(0.5),Nb(0.5))(2)AlC, (V(0.5),Cr(0.5))(3)AlC(2), and Ti(3)AlCN by the simple immersion of their powders, at room temperature, in HF of varying concentrations for times varying between 10 and 72 h followed by sonication. The removal of the "A" group layer from the MAX phases results in 2-D layers that we are labeling MXenes to denote the loss of the A element and emphasize their structural similarities with graphene. The sheet resistances of the MXenes were found to be comparable to multilayer graphene. Contact angle measurements with water on pressed MXene surfaces showed hydrophilic behavior.
The authors' abstract, as published at the source. ACS Nano, 2012 · DOI ↗
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Field: Materials Chemistry
Materials ChemistryMaterials Science