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      Two-dimensional transition metal carbides.

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          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.

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          Author and article information

          Journal
          ACS Nano
          ACS nano
          1936-086X
          1936-0851
          Feb 28 2012
          : 6
          : 2
          Affiliations
          [1 ] Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.
          Article
          10.1021/nn204153h
          22279971
          c6271d43-ae2c-4efc-9c17-d82b0af291be
          History

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