‘Magic’ of twisted multi-layered graphene and 2D nano-heterostructures

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
K. Saumya, Susmita Naskar, T. Mukhopadhyay
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引用次数: 2

Abstract

Two-dimensional materials with a single or few layers are exciting nano-scale materials that exhibit unprecedented multi-functional properties including optical, electronic, thermal, chemical and mechanical characteristics. A single layer of different 2D materials or a few layers of the same material may not always have the desired application-specific properties to an optimal level. In this context, a new trend has started gaining prominence lately to develop engineered nano-heterostructures by algorithmically stacking multiple layers of single or different 2D materials, wherein each layer could further have individual twisting angles. The enormous possibilities of forming heterostructures through combining a large number of 2D materials with different numbers, stacking sequences and twisting angles have expanded the scope of nano-scale design well beyond considering only a 2D material mono-layer with a specific set of given properties. Magic angle twisted bilayer graphene (BLG), a functional variant of van der Waals heterostructures, has created a buzz recently since it achieves unconventional superconductivity and Mott insulation at around 1.1∘ twist angle. These findings have ignited the interest of researchers to explore a whole new family of 2D heterostructures by introducing twists between layers to tune and enhance various multi-physical properties individually as well as their weighted compound goals. Here we aim to abridge outcomes of the relevant literature concerning twist-dependent physical properties of BLG and other multi-layered heterostructures, and subsequently highlight their broad-spectrum potential in critical engineering applications. The evolving trends and challenges have been critically analysed along with insightful perspectives on the potential direction of future research.
扭曲多层石墨烯和二维纳米异质结构的“魔力”
单层或多层二维材料是令人兴奋的纳米材料,具有前所未有的多功能特性,包括光学、电子、热、化学和机械特性。一层不同的2D材料或几层相同的材料可能并不总是具有理想的应用特定属性到最佳水平。在这种背景下,最近出现了一种新的趋势,即通过算法叠加多层单一或不同的二维材料来开发工程纳米异质结构,其中每层可以进一步具有单独的扭曲角度。通过组合大量具有不同数量,堆叠顺序和扭曲角度的二维材料形成异质结构的巨大可能性已经扩展了纳米级设计的范围,远远超出了仅考虑具有特定一组给定性质的二维单层材料。魔角扭曲双层石墨烯(BLG)是范德华异质结构的一种功能变体,最近引起了轰动,因为它在约1.1°扭转角时实现了非常规的超导性和莫特绝缘。这些发现激发了研究人员探索全新二维异质结构家族的兴趣,通过在层之间引入扭曲来调整和增强各种不同的多物理性质以及它们的加权复合目标。在这里,我们的目标是简要介绍有关BLG和其他多层异质结构的扭曲依赖物理性质的相关文献,并随后强调它们在关键工程应用中的广谱潜力。对不断变化的趋势和挑战进行了批判性分析,并对未来研究的潜在方向提出了富有洞察力的观点。
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来源期刊
Nano Futures
Nano Futures Chemistry-General Chemistry
CiteScore
4.30
自引率
0.00%
发文量
35
期刊介绍: Nano Futures mission is to reflect the diverse and multidisciplinary field of nanoscience and nanotechnology that now brings together researchers from across physics, chemistry, biomedicine, materials science, engineering and industry.
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