Evaporative Thinning: A Facile Synthesis Method for High Quality Ultrathin Layers of 2D Crystals
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- 作者：Yi-Kai Huang ; Jeffrey D. Cain ; Lintao Peng ; Shiqiang Hao ; Thomas Chasapis ; Mercouri G. Kanatzidis ; Christopher Wolverton ; Matthew Grayson ; Vinayak P. Dravid
- 刊名：ACS Nano
- 出版年：2014
- 出版时间：October 28, 2014
- 年：2014
- 卷：8
- 期：10
- 页码：10851-10857
- 全文大小：408K
- ISSN：1936-086X
文摘
The palette of two-dimensional materials has expanded beyond graphene in recent years to include the chalcogenides among other systems. However, there is a considerable paucity of methods for controlled synthesis of mono- and/or few-layer two-dimensional materials with desirable quality, reproducibility, and generality. Here we show a facile top-down synthesis approach for ultrathin layers of 2D materials down to monolayer. Our method is based on controlled evaporative thinning of initially large sheets, as deposited by vapor mass-transport. Rather than optimizing conditions for monolayer deposition, our approach makes use of selective evaporation of thick sheets to control the eventual thickness, down to a monolayer, a process which appears to be self-stopping. As a result, 2D sheets with high yield, high reproducibility, and excellent quality can be generated with large (>10 渭m) and thin (鈭?鈥? nm) dimensions. Evaporative thinning promises to greatly reduce the difficulty involved in isolating large, mono- and few-layers of 2D materials for subsequent studies.