Quality Heterostructures from Two-Dimensional Crystals Unstable in Air by Their Assembly in Inert Atmosphere
Yang Cao,Artem Mishchenko,Geliang Yu,Ekaterina Khestanova,A. P. Rooney,Eric Prestat,Andrey V. Kretinin,Peter Blake,Moshe Ben Shalom,Colin R. Woods,J. Chapman,Geetha Balakrishnan,Irina V. Grigorieva,Konstantin S. Novoselov,Benjamin A. Piot,Marek Potemski,Kenji Watanabe,T. Taniguchi,Sarah J. Haigh,Andre K. Geim,Roman V. Gorbachev +20 more
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TLDR
A remedial approach based on cleavage, transfer, alignment, and encapsulation of air-sensitive crystals, all inside a controlled inert atmosphere, which offers a venue to significantly expand the range of experimentally accessible two-dimensional crystals and their heterostructures.Abstract:
Many layered materials can be cleaved down to individual atomic planes, similar to graphene, but only a small minority of them are stable under ambient conditions. The rest react and decompose in air, which has severely hindered their investigation and potential applications. Here we introduce a remedial approach based on cleavage, transfer, alignment, and encapsulation of air-sensitive crystals, all inside a controlled inert atmosphere. To illustrate the technology, we choose two archetypal two-dimensional crystals that are of intense scientific interest but are unstable in air: black phosphorus and niobium diselenide. Our field-effect devices made from their monolayers are conductive and fully stable under ambient conditions, which is in contrast to the counterparts processed in air. NbSe2 remains superconducting down to the monolayer thickness. Starting with a trilayer, phosphorene devices reach sufficiently high mobilities to exhibit Landau quantization. The approach offers a venue to significantly ex...read more
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Oxidation of metallic two-dimensional transition metal dichalcogenides: 1T-MoS2 and 1T-TaS2
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Observation of A1g Raman mode splitting in few layer black phosphorus encapsulated with hexagonal boron nitride
Joanna Urban,Michal Baranowski,Michal Baranowski,Alessandro Surrente,Damian Włodarczyk,Andrzej Suchocki,Gen Long,Yangyuan Wang,L. Klopotowski,Ning Wang,D. K. Maude,Paulina Plochocka +11 more
TL;DR: A so far elusive peak in the Raman spectra ∼4 cm-1 above the A mode in trilayer and thicker flakes is observed, which suggests a significant impact of h-BN encapsulation on the properties of black phosphorus and can serve as an indicator of the quality of its surface.
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Giant tunnelling electroresistance through 2D sliding ferroelectric materials.
TL;DR: In this paper , a sliding van der Waals tunnel junction (FTJ) was developed using the sliding ferroelectric hexagonal boron nitride unit as an ultrathin barrier.
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Degradation Chemistry and Kinetic Stabilization of Magnetic CrI3.
Taiming Zhang,Magdalena Grzeszczyk,Jing Li,Wei Yu,Hao Xu,Peng He,Liming Yang,Zhizhan Qiu,Huihui Lin,Huimin Yang,Jian Zeng,Tao Sun,Zejun Li,Jishan Wu,Ming-Hsiang Lin,Kian Ping Loh,Chenliang Su,Kostya S. Novoselov,Alexandra Carvalho,Maciej Koperski,Jiong-Heng Lu +20 more
TL;DR: In this article , the authors performed a systematic investigation of the degradation chemistry of chromium iodide (CrI3) via a joint spectroscopic and microscopic analysis of the structural and composition evolution of bulk and exfoliated nanoflakes in different environments.
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