MXenes公司
材料科学
碳化物
制作
石墨烯
蚀刻(微加工)
碳化钛
薄膜
溅射
外延
电阻率和电导率
纳米技术
导电体
钛
光电子学
复合材料
图层(电子)
冶金
电气工程
工程类
医学
病理
替代医学
作者
Joseph Halim,Maria R. Lukatskaya,Kevin M. Cook,Jun Lu,Cole Smith,Lars-Åke Näslund,Steven J. May,Lars Hultman,Yury Gogotsi,Per Eklund,Michel W. Barsoum
摘要
Since the discovery of graphene, the quest for two-dimensional (2D) materials has intensified greatly. Recently, a new family of 2D transition metal carbides and carbonitrides (MXenes) was discovered that is both conducting and hydrophilic, an uncommon combination. To date MXenes have been produced as powders, flakes, and colloidal solutions. Herein, we report on the fabrication of ∼1 × 1 cm2 Ti3C2 films by selective etching of Al, from sputter-deposited epitaxial Ti3AlC2 films, in aqueous HF or NH4HF2. Films that were about 19 nm thick, etched with NH4HF2, transmit ∼90% of the light in the visible-to-infrared range and exhibit metallic conductivity down to ∼100 K. Below 100 K, the films' resistivity increases with decreasing temperature and they exhibit negative magnetoresistance-both observations consistent with a weak localization phenomenon characteristic of many 2D defective solids. This advance opens the door for the use of MXenes in electronic, photonic, and sensing applications.
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