Department of Mechanical Engineering and Materials Science, Yale University , New Haven, Connecticut 06511, United States.
ACS Nano. 2014 Sep 23;8(9):9550-7. doi: 10.1021/nn503853a. Epub 2014 Aug 27.
We demonstrate a one-step, facile chemical synthesis of heterostructures based on two-dimensional (2D) transition metal dichalcogenides (TMDCs) with vertically aligned 2D layers. Specifically, by using a chemical vapor transport method, we synthesize molybdenum (Mo)/tungsten (W)-based disulfide and diselenide heterostructures, such as MoS2/WS2 and MoSe2/WSe2. Detailed structural characterizations reveal that the 2D layers of two different TMDCs are vertically standing/aligned exposing the edge sites of the layers. The TMDC heterostructure materials exhibit a high uniformity of structural/chemical heterogeneity over a large area (>1 cm(2)) and show anisotropic carrier transport properties. These materials with unique heterostructures have great implications for both technological applications and fundamental sciences.
我们展示了一种基于二维（2D）过渡金属二硫属化物（TMDC）的具有垂直排列的 2D 层的异质结构的一步简便化学合成方法。具体而言，我们通过使用化学气相输运方法，合成了钼（Mo）/钨（W）基的二硫化物和二硒化物异质结构，例如 MoS2/WS2 和 MoSe2/WSe2。详细的结构表征表明，两种不同 TMDC 的 2D 层垂直站立/对齐，暴露了层的边缘位置。TMDC 异质结构材料在大面积（>1cm2）上表现出结构/化学异质的高均匀性，并表现出各向异性的载流子输运性质。这些具有独特异质结构的材料对技术应用和基础科学都具有重要意义。
