西班牙马德里自治大学Prez, Emilio M.团队报道了具有共价连接MoS₂–石墨烯异质结构器件的制备。相关研究成果于2022年4月25日发表在国际顶尖学术期刊《自然化学》。

合成2D–2D异质结构最广泛的方法是一种材料在另一种材料上直接生长。或者，不同材料的薄片可以手动堆叠在彼此的顶部。这两种方法通常涉及通过范德华力堆叠2D层，这些材料通常被称为范德华异质结构，并且一次堆叠一个晶体或一个器件。

该文中，研究人员描述了2H-MoS₂薄片共价接枝到嵌入场效应晶体管的石墨烯单分子膜上。使用了一种以马来酰亚胺和重氮官能团为特征的双功能分子，已知其分别与硫化物和碳基材料连接。将MoS₂薄片剥离，通过与马来酰亚胺部分反应使其功能化，然后通过重氮基团锚定到石墨烯上。该方法可以同时实现多个设备的功能化。由此产生的异质结构的电子性质由MoS₂-石墨烯界面决定。

附：原文原文

Title: Fabrication of devices featuring covalently linked MoS2–graphene heterostructures

Author: Vzquez Sulleiro, Manuel, Develioglu, Aysegul, Quirs-Ovies, Ramiro, Martn-Prez, Luca, Martn Sabans, Natalia, Gonzalez-Juarez, Maria Lourdes, Gmez, I. Jnnifer, Vera-Hidalgo, Mariano, Sebastin, Vctor, Santamara, Jess, Burzur, Enrique, Prez, Emilio M.

Issue&Volume: 2022-04-25

Abstract: The most widespread method for the synthesis of 2D–2D heterostructures is the direct growth of one material on top of the other. Alternatively, flakes of different materials can be manually stacked on top of each other. Both methods typically involve stacking 2D layers through van der Waals forces—such that these materials are often referred to as van der Waals heterostructures—and are stacked one crystal or one device at a time. Here we describe the covalent grafting of 2H-MoS2 flakes onto graphene monolayers embedded in field-effect transistors. A bifunctional molecule featuring a maleimide and a diazonium functional group was used, known to connect to sulfide- and carbon-based materials, respectively. MoS2 flakes were exfoliated, functionalized by reaction with the maleimide moieties and then anchored to graphene by the diazonium groups. This approach enabled the simultaneous functionalization of several devices. The electronic properties of the resulting heterostructure are shown to be dominated by the MoS2–graphene interface.

DOI: 10.1038/s41557-022-00924-1

Source: https://www.nature.com/articles/s41557-022-00924-1