物理化学学报 >> 2019, Vol. 35 >> Issue (10): 1099-1111.doi: 10.3866/PKU.WHXB201811005

所属专题: 二维材料及器件

综述 上一篇    下一篇

基于液相法二维异质结的空间结构可控制备

刘强,王晓珊,王加亮,黄晓*()   

  • 收稿日期:2018-11-05 发布日期:2018-12-03
  • 通讯作者: 黄晓 E-mail:iamxhuang@njtech.edu.cn
  • 作者简介:Xiao Huang received her bachelor's degree from the School of Materials Science and Engineering at Nanyang Technological University in Singapore in 2006 and completed her PhD in 2011 under the supervision of Prof. Hua Zhang and Prof. Freddy Boey. She is currently a professor at the Institute of Advanced Materials (IAM), Nanjing Tech University. Her research interest includes the synthesis and applications of two-dimensional nanomaterial-based hybrids
  • 基金资助:
    国家自然科学基金(51322202)

Spatially Controlled Two-dimensional Heterostructures via Solution-phase Growth

Qiang LIU,Xiaoshan WANG,Jialiang WANG,Xiao HUANG*()   

  • Received:2018-11-05 Published:2018-12-03
  • Contact: Xiao HUANG E-mail:iamxhuang@njtech.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(51322202)

摘要:

近年来,二维材料异质结构的兴起进一步促进了二维材料领域的发展。在异质结构中,不同组分的界面作用或耦合效应会产生有趣的现象和特殊的性质。目前发现除材料组分外,空间结构也是影响异质结构总体性质的重要因素。尽管诸如干法转移和气相生长的固相法能够将原始或高度结晶的二维晶体制备出空间可控的异质结构,但是它们在很大程度上受限于低产率和高成本的缺点。相比之下,液相法虽然产物质量相对较低,但更适用于大规模生产功能性异质结构。然而,如何对组分的三维空间布局进行精确控制仍是目前液相法亟待解决的问题。在这篇综述中,我们介绍了通过湿化学法制备二维异质结构的最新进展,聚焦于对二维异质结构空间布局的控制。在本文的末尾,我们还讨论了此领域面临的挑战和潜在的机遇。

关键词: 二维异质结构, 液相合成, 空间排列, 横向异质结, 垂直异质结

Abstract:

The research in two-dimensional (2D) materials, such as graphene, transition metal dichalcogenides (TMDs) and black phosphorus, has been further flourished with the recent emergence of heterostructures composed of dissimilar 2D materials. The interfacing/coupling between different constituent components in a heterostructure has given rise to interesting phenomena and useful properties. For example, depending on the type of 2D materials, the distance and the kind of bonding between them, as well as the crystalline property of the hetero-interface, the interface may provide charge traps, exciton recombination centers, or bridges for effective charge/energy transfer. It has also been found that the spatial arrangement in addition to the composition of the constituents is an important factor influencing the overall properties of the heterostructures. Although many methods, such as dry transfer and vapor-phased growth are able to yield heterostructures from pristine or highly crystalline 2D crystals with spatial control, such as vertical heterostructures and lateral heterostructures, these methods are generally not scalable, which has restricted the use of the obtained heterostructures mostly to fundamental studies. The solution-phased synthesis methods, such as solvothermal/hydrothermal synthesis, electrochemical deposition and hot-injection method, may be more suitable for mass production of functional heterostructures despite the relatively low product quality. In the past couple of years, a diverse kinds of hetero/hybrid structures of 2D materials have been prepared successfully in wet-chemical processes. However, precise control over the geometric arrangement of the constituent components has been challenging in solution. Currently, four types of heterostructures including 2D crystals grown on a larger 2D template, vertical heterostructures, lateral heterostructures, and core-shell heterostructures have been prepared in solution. For the first type, flexible 2D nanosheets such as graphene and monolayer TMDs are used as synthesis templates to support the nucleation and growth of other 2D crystals. For vertical heterostructures, relatively rigid nanoplates are used to allow continuous deposition of 2D layers of other materials to form sandwich-like structures. The formation of lateral heterostructures requires edge growth on existing 2D materials without basal deposition, and therefore other methods such as cation exchange can be used as alternative routes. The preparation of core-shell 2D heterostructures generally involves both epitaxial edge growth and basal deposition and has been realized in both metallic and semiconductor structures. In this review, these kinds of heterostructures based on 2D materials will be discussed in terms of their synthesis methods, properties and possible applications. In addition, we will discuss the challenges and possible opportunities in this research direction.

10.3866/PKU.WHXB201809013.F0011  

Key words: 2D heterostructure, Solution-phased synthesis, Spatial arrangement, Lateral heterostructure, Vertical heterostructure

MSC2000: 

  • O647