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标题:Two-dimensional transition metal carbides.
时间:2019-12-03 20:41:43
DOI:10.1021/nn204153h
PMID:22279971
作者:Naguib, Michael; Mashtalir, Olha; Carle, Joshua
关键词:MXene, two-dimensional materials, carbides, carbonitrides, exfoliation
出版源: 《Acs Nano》 ,6 (2) :1322-1331
摘要: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.
大小:863 kb
页数:11 PAGES
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