超大型TiCT MXene薄片的软剥离
Ultralarge Flakes of TiCT MXene Soft Delamination.
作者信息
Shekhirev Mikhail, Busa Jeffrey, Shuck Christopher E, Torres Angel, Bagheri Saman, Sinitskii Alexander, Gogotsi Yury
机构信息
A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States.
Department of Chemistry and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States.
出版信息
ACS Nano. 2022 Sep 27;16(9):13695-13703. doi: 10.1021/acsnano.2c04506. Epub 2022 Jul 25.
Two-dimensional (2D) titanium carbide MXene (TiCT) has attracted significant attention due to its combination of properties and great promise for various applications. The size of the 2D sheets is a critical parameter affecting multiple properties of assembled films, fibers and 3D structures. The increased lateral size of MXene flakes can benefit not only their assemblies by improving the interflake contacts and alignment but also fundamental studies at the individual flake level, allowing for facile patterning and investigation of intrinsic physical properties of MXenes. Increasing the average size of the parent MAX phase is one of the strategies previously used to increase the flake size of the resultant MXene. Here, we show that the protocol used for the next step of the synthesis procedure, delamination of multilayer MXene into individual nanosheets, significantly affects the lateral size of the resultant flakes. We developed a soft delamination approach, which prevents fracture of flakes and preserves their size. Combining this approach with the large-grain TiAlC MAX phase precursor, we achieved individual flakes of up to 40 μm in lateral size. These flakes can be used for patterning multiple contacts and fabrication of field-effect transistors for multiprobe electrical characterization and other measurements. These findings indicate the importance of controlling the delamination process in order to achieve large MXene flakes and improve properties of MXene-based materials and devices.
二维(2D)碳化钛MXene(TiCT)因其综合性能以及在各种应用中展现出的巨大潜力而备受关注。二维薄片的尺寸是影响组装薄膜、纤维和三维结构多种性能的关键参数。MXene薄片横向尺寸的增加不仅有利于通过改善薄片间接触和排列来实现其组装,还有利于在单个薄片层面开展基础研究,从而便于进行图案化以及研究MXene的本征物理性质。增加母体MAX相的平均尺寸是此前用于增大所得MXene薄片尺寸的策略之一。在此,我们表明,合成过程下一步中用于将多层MXene分层为单个纳米片的方案,会显著影响所得薄片的横向尺寸。我们开发了一种软分层方法,可防止薄片断裂并保持其尺寸。将该方法与大晶粒TiAlC MAX相前驱体相结合,我们获得了横向尺寸达40μm的单个薄片。这些薄片可用于图案化多个触点以及制造用于多探针电学表征和其他测量的场效应晶体管。这些发现表明了控制分层过程对于获得大尺寸MXene薄片以及改善基于MXene的材料和器件性能的重要性。