Search query: 2D transition metal dichalcogenides

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abstract: Graphene is very popular because of its many fascinating properties, but its lack of an electronic bandgap has stimulated the search for 2D materials with semiconducting character. Transition metal dichalcogenides (TMDCs) which are semiconductors of the type MX2, where M is a transition metal atom (such as Mo or W) and X is a chalcogen atom (such as S, Se or Te) provide a promising alternative. Because of its robustness, MoS2 is the most studied material in this family. TMDCs exhibit a unique combination of atomic scale thickness, direct bandgap, strong spin orbit coupling and favourable electronic and mechanical properties, which make them interesting for fundamental studies and for applications in high end electronics, spintronics, optoelectronics, energy harvesting, flexible electronics, DNA sequencing and personalized medicine. In this Review, the methods used to synthesize TMDCs are examined and their properties are discussed, with particular attention to their charge density wave, superconductive and topological phases. The use of TMCDs in nanoelectronic devices is also explored, along with strategies to improve charge carrier mobility, high frequency operation and the use of strain engineering to tailor their properties. Two dimensional transition metal dichalcogenides (TMDCs) exhibit attractive electronic and mechanical properties. In this Review, the charge density wave, superconductive and topological phases of TMCDs are discussed, along with their synthesis and applications in devices with enhanced mobility and with the use of strain engineering to improve their properties.
author_names: Sajedeh Manzeli

Dmitry Ovchinnikov

Diego Jose Pasquier

Oleg V Yazyev

Andras Kis
title: 2D transition metal dichalcogenides
year: 2017

abstract: In recent years, 2D layered materials have received considerable research interest on account of their substantial material systems and unique physicochemical properties. Among them, 2D layered transition metal dichalcogenides (TMDs) a star family member, have already been explored over the last few years and have exhibited excellent performance in electronics, catalysis, and other related fields. However, to fulfill the requirement for practical application, the batch production of 2D TMDs is essential. Recently, the chemical vapor deposition (CVD) technique was considered as an elegant alternative for successfully growing 2D TMDs and their heterostructures. The latest research advances in the controllable synthesis of 2D TMDs and related heterostructures/superlattices via the CVD approach are illustrated here. The controlled growth behavior, preparation strategies, and breakthroughs on the synthesis of new 2D TMDs and their heterostructures, as well as their unique physical phenomena, are also discussed. Recent progress on the application of CVD grown 2D materials is revealed with particular attention to electronics/optoelectronic devices and catalysts. Finally, the challenges and future prospects are considered regarding the current development of 2D TMDs and related heterostructures.
author_names: Yuanyuan Zhang

Yuyu Yao

Marshet Getaye Sendeku

Lei Yin

Xueying Zhan

Feng Wang

Zhenxing Wang

Jun He
title: Recent Progress in CVD Growth of 2D Transition Metal Dichalcogenides and Related Heterostructures.
venue: Advanced materials
year: 2019

abstract: AbstractRoom temperature (RT) gas sensing is desirable for battery powered or self powered instrumentation that can monitor emissions associated with pollution and industrial processes. This review (with 171 references) discusses recent advances in three types of porous nanostructures that have shown remarkable potential for RT gas sensing. The first group comprises hierarchical oxide nanostructures (mainly oxides of Sn, Ni, Zn, W, In, La, Fe, Co) The second group comprises graphene and its derivatives (graphene, graphene oxides, reduced graphene oxides, and their composites with metal oxides and noble metals) The third group comprises 2D transition metal dichalcogenides (mainly sulfides of Mo, W, Sn, Ni, also in combination with metal oxides) They all have been found to enable RT sensing of gases such as NOx, NH3, H2, SO2, CO, and of vapors such as of acetone, formaldehyde or methanol. Attractive features also include high selectivity and sensitivity, long term stability and affordable costs. Strengths and limitations of these materials are highlighted, and prospects with respect to the development of new materials to overcome existing limitations are discussed. Graphical AbstractThe review summarizes the most significant progresses related to room temperature gas sensing by using hierarchical oxide nanostructures, graphene and its derivatives and 2D transition metal dichalcogenides, highlighting the peculiar gas sensing behavior with enhanced selectivity, sensitivity and long term stability.
author_names: Nirav Joshi

Takeshi Hayasaka

Yumeng Liu

Huiliang Liu

Osvaldo N Oliveira

Liwei Lin
title: A review on chemiresistive room temperature gas sensors based on metal oxide nanostructures, graphene and 2D transition metal dichalcogenides
venue: Microchimica Acta
year: 2018

abstract: Investigations on monolayered transition metal dichalcogenides (TMDs) and TMD heterostructures have been steadily increasing over the past years due to their potential application in a wide variety of fields such as microelectronics, sensors, batteries, solar cells, and supercapacitors, among others. The present work focuses on the characterization of TMDs using transmission electron microscopy, which allows not only static atomic resolution but also investigations into the dynamic behavior of atoms within such materials. Herein, we present a body of recent research from the various techniques available in the transmission electron microscope to structurally and analytically characterize layered TMDs and briefly compare the advantages of TEM with other characterization techniques. Whereas both static and dynamic aspects are presented, special emphasis is given to studies on the electron driven in situ dynamic aspects of these materials while under investigation in a transmission electron microscope. The collection of the presented results points to a future prospect where electron driven nanomanipulation may be routinely used not only in the understanding of fundamental properties of TMDs but also in the electron beam engineering of nanocircuits and nanodevices.
author_names: Rafael Gregorio Mendes

Jinbo Pang

Alicja Bachmatiuk

Huy Quang Ta

Liang Zhao

Thomas Gemming

Lei Fu

Zhongfan Liu

Mark Hermann Rummeli
title: Electron Driven In Situ Transmission Electron Microscopy of 2D Transition Metal Dichalcogenides and Their 2D Heterostructures.
venue: ACS nano
year: 2019

abstract: The optimization of traditional electrocatalysts has reached a point where progress is impeded by fundamental physical factors including inherent scaling relations among thermokinetic characteristics of different elementary reaction steps, non Nernstian behavior, and electronic structure of the catalyst. This indicates that the currently utilized classes of electrocatalysts may not be adequate for future needs. This study reports on synthesis and characterization of a new class of materials based on 2D transition metal dichalcogenides including sulfides, selenides, and tellurides of group V and VI transition metals that exhibit excellent catalytic performance for both oxygen reduction and evolution reactions in an aprotic medium with Li salts. The reaction rates are much higher for these materials than previously reported catalysts for these reactions. The reasons for the high activity are found to be the metal edges with adiabatic electron transfer capability and a cocatalyst effect involving an ionic liquid electrolyte. These new materials are expected to have high activity for other core electrocatalytic reactions and open the way for advances in energy storage and catalysis.
author_names: Leily Majidi

Poya Yasaei

Robert E Warburton

Shadi Fuladi

John Cavin

Xuan Hu

Zahra Hemmat

Sung Beom Cho

Pedram Abbasi

Marton Voros

Lei Cheng

Baharak Sayahpour

Igor L Bolotin

Peter Zapol

Jeffrey P Greeley

Robert F Klie

Rohan Mishra

Fatemeh Khalili-Araghi

Larry A Curtiss

Amin Salehi-Khojin
title: New Class of Electrocatalysts Based on 2D Transition Metal Dichalcogenides in Ionic Liquid.
venue: Advanced materials
year: 2019

abstract: Two dimensional semiconducting transition metal dichalcogenides (TMDCs) have recently become attractive materials for several optoelectronic applications, such as photodetection, light harvesting, phototransistors, light emitting diodes, and lasers. Their bandgap lies in the visible and near IR range, and they possess strong excitonic resonances, high oscillator strengths, and valley selective response. Coupling these materials to optical nanocavities enhances the quantum yield of exciton emission, enabling advanced quantum optics and nanophotonics devices. Here, we review the state of the art advances of hybrid exciton polariton structures based on monolayer TMDCs coupled to plasmonic and dielectric nanocavities. We discuss the optical properties of 2D WS2, WSe2, MoS2 and MoSe2 materials, paying special attention to their energy bands, photoluminescence/absorption spectra, excitonic fine structure, and to the dynamics of exciton formation and valley depolarization. We also discuss light matter interactions in such hybrid exciton polariton structures. Finally, we focus on weak and strong coupling regimes in monolayer TMDCs based exciton polariton systems, envisioning research directions and future opportunities for this material platform.
author_names: Alexander E Krasnok

Sergey Lepeshov

Andrea Alu
title: Nanophotonics with 2D transition metal dichalcogenides [Invited]
venue: Optics express
year: 2018

abstract: Recent research has revealed a gamut of interesting properties present in layered two dimensional (2D) transition metal dichalcogenides (TMDCs) such as photoluminescence, comparatively high electron mobility, flexibility, mechanical strength and relatively low toxicity. The large surface to area ratio inherent in these materials also allows easy functionalization and maximal interaction with the external environment. Due to its unique physical and chemical properties, much work has been done in tailoring TMDCs through chemical functionalization for use in a diverse range of biomedical applications as biosensors, drug delivery carriers or even as therapeutic agents. In this review, current progress on the different types of TMDC functionalization for various biological applications will be presented and its future outlook will be discussed.
author_names: Zibiao Li

Swee Liang Wong
title: Functionalization of 2D transition metal dichalcogenides for biomedical applications.
venue: Materials science engineering. C, Materials for biological applications
year: 2017

abstract: Alloying in 2D results in the development of new, diverse, and versatile systems with prospects in bandgap engineering, catalysis, and energy storage. Tailoring structural phase transitions using alloying is a novel idea with implications in designing all 2D device architecture as the structural phases in 2D materials such as transition metal dichalcogenides are correlated with electronic phases. Here, this study develops a new growth strategy employing chemical vapor deposition to grow monolayer 2D alloys of Re doped MoSe2 with show composition tunable structural phase variations. The compositions where the phase transition is observed agree well with the theoretical predictions for these 2D systems. It is also shown that in addition to the predicted new electronic phases, these systems also provide opportunities to study novel phenomena such as magnetism which broadens the range of their applications.
author_names: Vidya Kochat

Amey Apte

Jordan A Hachtel

Hiroyuki Kumazoe

Aravind Krishnamoorthy

Sandhya Susarla

Juan Carlos Idrobo

Fuyuki Shimojo

Priya Vashishta

Rajiv K Kalia

Aiichiro Nakano

Chandra Sekhar Tiwary

Pulickel M Ajayan
title: Re Doping in 2D Transition Metal Dichalcogenides as a New Route to Tailor Structural Phases and Induced Magnetism.
venue: Advanced materials
year: 2017

abstract: As a hole transport layer (HTL) material, poly(3,4 ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) was often criticized for its intrinsic acidity and hygroscopic effect that would in the long run affect the stability of perovskite solar cells (Pero SCs) As alternatives, herein water soluble two dimensional (2D) transition metal dichalcogenides (TMDs) such as MoS2 and WS2 were used as HTLs in p i n Pero SCs. It was found that the content of 1T phase in 2D TMDs HTLs is centrally important to the power conversion efficiencies (PCEs) of Pero SCs, and the 1T rich TMDs (as achieved from exfoliation and without postheating) lead to much higher PCEs. More importantly, as PEDOT:PSS was replaced by 2D TMDs, both the PCEs and stability of Pero SCs were significantly improved. The highest PCEs of 14.35 and 15.00% were obtained for the Pero SCs with MoS2 and WS2, respectively, whereas the Pero SCs with PEDOT:PSS showed a highest PCE of only 12.44% These are up to date the highest PCEs using 2D TMDs as HTLs. After being stored in a glovebox for 56 days, PCEs of the Pero SCs using MoS2 and WS2 HTLs remained 78 and 72% respectively, whereas the PCEs of Pero SCs with PEDOT:PSS almost dropped to 0 over 35 days. This study demonstrates that water soluble 2D TMDs have great potential for application as new generation of HTLs aiming at high performance and long term stable Pero SCs.
author_names: Peng Huang

Zhao-wei Wang

Yanfeng Liu

Kai-cheng Zhang

Ligang Yuan

Yi Zhou

Bo Song

Yongfang Li
title: Water Soluble 2D Transition Metal Dichalcogenides as the Hole Transport Layer for Highly Efficient and Stable p i n Perovskite Solar Cells.
venue: ACS applied materials interfaces
year: 2017

abstract: Two dimensional (2D) transition metal dichalcogenides (TMDs) have stimulated the modern technology due to their unique and tunable electronic, optical, and chemical properties. Therefore, it is very important to study the control parameters for material preparation to achieve high quality thin films for modern electronics, as the performance of TMDs based device largely depends on their layer number, grain size, orientation, and morphology. Among the synthesis methods, chemical vapor deposition (CVD) is an excellent technique, vastly used to grow controlled layer of 2D materials in recent years. In this review, we discuss the different growth routes and mechanisms to synthesize high quality large size TMDs using CVD method. We highlight the recent advances in the controlled growth of mono and few layer TMDs materials by varying different growth parameters. Finally, different strategies to control the grain size, boundaries, orientation, morphology and their application for various field of are also thoroughly discussed.
author_names: Jiawen You

Md Delowar Hossain

Zhengtang Luo
title: Synthesis of 2D transition metal dichalcogenides by chemical vapor deposition with controlled layer number and morphology
venue: Nano Convergence
year: 2018