Search query: Two-dimensional layered materials

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abstract: Ultrathin two dimensional nanosheets of layered transition metal dichalcogenides (TMDs) are fundamentally and technologically intriguing. In contrast to the graphene sheet, they are chemically versatile. Mono or few layered TMDs obtained either through exfoliation of bulk materials or bottom up syntheses are direct gap semiconductors whose bandgap energy, as well as carrier type (n or p type) varies between compounds depending on their composition, structure and dimensionality. In this Review, we describe how the tunable electronic structure of TMDs makes them attractive for a variety of applications. They have been investigated as chemically active electrocatalysts for hydrogen evolution and hydrosulfurization, as well as electrically active materials in opto electronics. Their morphologies and properties are also useful for energy storage applications such as electrodes for Li ion batteries and supercapacitors.
author_names: Manish Chhowalla

Hyeon Suk Shin

Goki Eda

Lain-Jong Li

Kian Ping Loh

Hua Zhang
title: The chemistry of two dimensional layered transition metal dichalcogenide nanosheets.
venue: Nature chemistry
year: 2013

abstract: It has recently been shown that sulfur, a solid material in its elementary form S 8 can stay in a supercooled state as liquid sulfur in an electrochemical cell. We establish that this newly discovered state could have implications for lithium sulfur batteries. Here, through in situ studies of electrochemical sulfur generation, we show that liquid (supercooled) and solid elementary sulfur possess very different areal capacities over the same charging period. To control the physical state of sulfur, we studied its growth on two dimensional layered materials. We found that on the basal plane, only liquid sulfur accumulates; by contrast, at the edge sites, liquid sulfur accumulates if the thickness of the two dimensional material is small, whereas solid sulfur nucleates if the thickness is large (tens of nanometres) Correlating the sulfur states with their respective areal capacities, as well as controlling the growth of sulfur on two dimensional materials, could provide insights for the design of future lithium sulfur batteries. A supercooled liquid phase of elemental sulfur can be grown electrochemically on two dimensional materials. This phase has a markedly higher areal capacity than solid sulfur, with possible implications for future lithium sulfur batteries.
author_names: Ankun Yang

Guangmin Zhou

Xian Kong

R Vila

Allen Pei

Yecun Wu

Xiaoyun Yu

Xueli Zheng

Chun-Lan Wu

Bofei Liu

Hao Chen

Yan Xu

Di Chen

Yanxi Li

Sirine Fakra

Harold Y Hwang

Jian Qin

Steven Chu

Yi Cui
title: Electrochemical generation of liquid and solid sulfur on two dimensional layered materials with distinct areal capacities
venue: Nature Nanotechnology
year: 2020

abstract: Layered transition metal dichalcogenides, such as tungsten disulfide, are exfoliated into atomically thin flakes. If they could be easily exfoliated, layered materials would become a diverse source of two dimensional crystals whose properties would be useful in applications ranging from electronics to energy storage. We show that layered compounds such as MoS2, WS2, MoSe2, MoTe2, TaSe2, NbSe2, NiTe2, BN, and Bi2Te3 can be efficiently dispersed in common solvents and can be deposited as individual flakes or formed into films. Electron microscopy strongly suggests that the material is exfoliated into individual layers. By blending this material with suspensions of other nanomaterials or polymer solutions, we can prepare hybrid dispersions or composites, which can be cast into films. We show that WS2 and MoS2 effectively reinforce polymers, whereas WS2/carbon nanotube hybrid films have high conductivity, leading to promising thermoelectric properties.
author_names: Jonathan N Coleman

Mustafa Lotya

Arlene O'Neill

Shane D Bergin

Paul J King

Umar Khan

Karen Young

Alexandre Gaucher

Sukanta De

Ronan J Smith

Igor V Shvets

Sunil K Arora

George Stanton

Hye-Young Kim

Kangho Lee

Gyu-Tae Kim

Georg S Duesberg

Toby Hallam

John J Boland

Jing Jing Wang

John F Donegan

Jaime C Grunlan

Gregory P Moriarty

Aleksey Shmeliov

Rebecca J Nicholls

James Michael Perkins

E M Grieveson

Koenraad Theuwissen

David W McComb

Peter D Nellist

Valeria Nicolosi
title: Two Dimensional Nanosheets Produced by Liquid Exfoliation of Layered Materials
venue: Science
year: 2011

abstract: Light modulation is an essential operation in photonics and optoelectronics. The recent demonstration that two dimensional layered materials could modulate various light properties (e.g. wavelength, amplitude, phase, and polarization) with superior performance has stimulated intense research and significant advances [1 7] paving the way for realistic photonic and optoelectronic applications [1 10] I will discuss the state of the art of optical modulators based on two dimensional layered materials including graphene [4 9] transition metal dichalcogenides [6] and black phosphorus [7] I will present recent advances employing hybrid structures, such as two dimensional heterostructures [1] plasmonic structures [10] and silicon/fibre integrated structures [5 10] I will also take a look at future perspectives of optical modulation technologies with two dimensional layered materials.
author_names: Zhipei Sun
title: Optical modulators with two dimensional layered materials
venue: 2016 Progress in Electromagnetic Research Symposium (PIERS)
year: 2016

abstract: Following a significant number of graphene studies, other two dimensional (2D) layered materials have attracted more and more interest for their unique structures and distinct physical properties, which has opened a window for realizing novel electronic or optoelectronic devices. Here, we present a comprehensive review on the applications of 2D layered semiconductors as photodetectors, including photoconductors, phototransistors, and photodiodes, reported in the past five years. The device designs, mechanisms, and performances of the photodetectors are introduced and discussed systematically. Emerging techniques to improve device performances by enhancing light matter interactions are addressed as well. Finally, we deliver a summary and outlook to provide a guideline of the future development of this rapidly growing field.
author_names: Chao Xie

Chun Hin Mak

Xiao-ming Tao

Feng Yan
title: Photodetectors Based on Two Dimensional Layered Materials Beyond Graphene
year: 2017

abstract: With the increasing interest in nanodevices based on two dimensional layered materials (2DLMs) after the birth of graphene, the mechanical and coupling properties of these materials, which play an important role in determining the performance and life of nanodevices, have drawn increasingly more attention. In this review, both experimental and simulation methods investigating the mechanical properties and behaviour of 2DLMs have been summarized, which is followed by the discussion of their elastic properties and failure mechanisms. For further understanding and tuning of their mechanical properties and behaviour, the influence factors on the mechanical properties and behaviour have been taken into consideration. In addition, the coupling properties between mechanical properties and other physical properties are summarized to help set up the theoretical blocks for their novel applications. Thus, the understanding of the mechanical and coupling properties paves the way to their applications in flexible electronics and novel electronics, which is demonstrated in the last part. This review is expected to provide in depth and comprehensive understanding of mechanical and coupling properties of 2DLMs as well as direct guidance for obtaining satisfactory nanodevices from the aspects of material selection, fabrication processes and device design.
author_names: Hao Zhan

Dan Guo

Guoxin Xie
title: Two dimensional layered materials: from mechanical and coupling properties towards applications in electronics.
venue: Nanoscale
year: 2019

abstract: Although the rechargeable lithium sulfur battery system has attracted significant attention due to its high theoretical specific energy, its implementation has been impeded by multiple challenges, especially the dissolution of intermediate lithium polysulfide (Li2Sn) species into the electrolyte. Introducing anchoring materials, which can induce strong binding interaction with Li2Sn species, has been demonstrated as an effective way to overcome this problem and achieve long term cycling stability and high rate performance. The interaction between Li2Sn species and anchoring materials should be studied at the atomic level in order to understand the mechanism behind the anchoring effect and to identify ideal anchoring materials to further improve the performance of Li S batteries. Using first principles approach with van der Waals interaction included, we systematically investigate the adsorption of Li2Sn species on various two dimensional layered materials (oxides, sulfides, and chlorides) and study the detailed interaction and electronic structure, including binding strength, configuration distortion, and charge transfer. We gain insight into how van der Waals interaction and chemical binding contribute to the adsorption of Li2Sn species for anchoring materials with strong, medium, and weak interactions. We understand why the anchoring materials can avoid the detachment of Li2S as in carbon substrate, and we discover that too strong binding strength can cause decomposition of Li2Sn species.
author_names: Qianfan Zhang

Yapeng Wang

Zhi Wei Seh

Zhongheng Fu

Ruifeng Zhang

Yi Cui
title: Understanding the Anchoring Effect of Two Dimensional Layered Materials for Lithium Sulfur Batteries.
venue: Nano letters
year: 2015

abstract: The development of two dimensional (2D) layered materials is driven by fundamental interest and their potential applications. Atomically thin 2D materials provide a wide range of basic building blocks with unique electrical, optical, and thermal properties which do not exist in their bulk counterparts. The van der Waals interlayer interaction enables the possibility to exfoliate and reassemble different 2D materials into arbitrarily and vertically stacked heterostructures. Recently developed vapor phase growth of 2D materials further paves the way of directly synthesizing vertical and lateral heterojunctions. This review provides insights into the layered 2D heterostructures, with a concise introduction to preparative approaches for 2D materials and heterostructures. These unique 2D heterostructures have abundant implications for many potential applications.
author_names: Ming-Yang Li

Chang Hsiao Chen

Yumeng Shi

Lain-Jong Li
title: Heterostructures based on two dimensional layered materials and their potential applications
year: 2016

abstract: The rise of graphene has motivated intensive investigation into other two dimensional layered materials (2DLMs) In addition to their superior optical, electrical, and mechanical properties, 2DLMs have also demonstrated intriguing thermal properties, the understanding of which is not only fundamentally important but also critical to enabling widespread applications in electronics, optoelectronics, and energy conversion and storage devices. Here, we review recent progress in the thermal transport of 2DLMs. Indeed, due to unique and diversified two dimensional crystal structures and the contribution of different phonon modes to thermal transport, while the family of 2DLMs share common thermal properties, such as layer dependent thermal conductivity, each member also has unique features related to thermal transport. Ultimately, the unusual and rich thermal properties of two dimensional materials can lay a solid foundation for understanding new phonon transport physics and potentially lead to novel applications in various emerging fields.
author_names: Yao Wang

Ning Xu

Dongqing Li

Jia Zhu
title: Thermal Properties of Two Dimensional Layered Materials
year: 2017

abstract: Two dimensional(2D) layered materials have attracted great attention due to their unique electrical, optical, thermal and mechanical properties. 2D layered materials have unique van der Waals gaps, thus the foreign substance, such as atoms, molecules and ions, can be inserted into the gaps to change the physical and chemical properties of 2D layered materials, which is conducive to realize their multi functional application. Herein, we present a critical review of recent research progress of 2D intercalated materials, including the synthesizing methods, theoretical calculation, characterization and multifunctional application. Finally, we will summarize the current challenges and future opportunities in the development of 2D intercalated materials.
author_names: Xinyun Zhou

Juehan Yang

Mianzeng Zhong

Qinglin Xia

Bo Li

Xidong Duan

Zhongming Wei
title: Intercalation of Two dimensional Layered Materials
venue: Chemical Research in Chinese Universities
year: 2020