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Two-Dimensional Materials and Nano Devices
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Two-Dimensional Materials and Nano Devices

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Materials Characterization".

Deadline for manuscript submissions: closed (10 January 2024) | Viewed by 4475

Special Issue Editor

Dr. Jingyuan Zhou

E-Mail Website
Guest Editor
Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
Interests: graphdiyne; intercalation and exfoliation; TMDs inks; 2D hybrid superlattices

Special Issue Information

Dear Colleagues,

Two-dimensional layered materials have attracted tremendous scientific and engineering interest in the past several decades due to their rich and tunable physical and chemical properties, with a near-perfect crystalline structure and dangling-bond-free surface. These atomically thin materials have emerged as a new platform for fundamental research and diverse technological opportunities in electronics, optics, catalysis, energy storage, and thermoelectronics. In general, 2D layered materials can be obtained by both bottom-up growth and top-down exfoliation methods.

The vast library of two-dimensional layered materials has been greatly extended in recent years, including graphene, transition metal chalcogenides (TMDs), hexagonal nitride (hBN), black phosphorus (BP), layered hydroxides (LDHs), silicene, transition metal carbides, nitrides and carbonitrides (MXenes), 2D metal organic frameworks (MOFs), 2D covalent organic frameworks (COFs), and 2D perovskites. The art of synthesis has brought rich controllability to their structures, and some tailoring strategies, such as phase engineering, doping, and intercalation, could further open new pathways to artificial materials with novel properties beyond the reach of existing materials. Therefore, the topic of 2D layered materials continues to be very thought-provoking.

It is my pleasure to invite you to submit a manuscript for this Special Issue; full papers, communications, and reviews are all welcome.

Dr. Jingyuan Zhou
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • two-dimensional layered materials
  • phase engineering
  • nano devices
  • energy storage
  • electro-catalysis

Published Papers (4 papers)

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Research

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10 pages, 5723 KiB  
Communication
Asymmetric Schottky Barrier in Rubrene Transistor via Monolayer Graphene Insertion toward Self-Powered Imaging
by Qing Liu, Xialian Zheng, Mengru Li, Qianqian Du, Chunhui Zhu, Wenjun Wang and Shuchao Qin
Materials 2023, 16(23), 7364; https://doi.org/10.3390/ma16237364 - 27 Nov 2023
Viewed by 601
Abstract
Organic semiconductor materials featuring lightweight, and flexibility may play a significant role in various future applications, such as foldable displays, wearable devices, and artificial skin. For developing high-performance organic devices, organic crystals are highly desired, while a remaining fundamental issue is their contact [...] Read more.
Organic semiconductor materials featuring lightweight, and flexibility may play a significant role in various future applications, such as foldable displays, wearable devices, and artificial skin. For developing high-performance organic devices, organic crystals are highly desired, while a remaining fundamental issue is their contact problem. Here, we have grown a high-quality rubrene single crystal by utilizing a simple in-air sublimation technique. The contact characteristics (barrier height and contact resistance) are detail-studied by resist-free transfer electrodes (Au metal or graphene/Au). The Schottky barrier of the rubrene/graphene interface is lower and can be also modulated by gate bias, which is confirmed by spatial photocurrent mapping. Finally, we demonstrated the zero-bias photocurrent imaging application by constructing the asymmetrical device employing different electrode contacts. Our work would be of significance for studying the contact issue of organic crystals and wireless imaging. Full article
(This article belongs to the Special Issue Two-Dimensional Materials and Nano Devices)
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11 pages, 2048 KiB  
Article
The Influence of the ITO Layers’ Thicknesses on Their Chosen Physical Surface Parameters
by Małgorzata Musztyfaga-Staszuk, Katarzyna Gawlińska-Nęcek, Robert Socha and Piotr Panek
Materials 2023, 16(4), 1363; https://doi.org/10.3390/ma16041363 - 06 Feb 2023
Cited by 1 | Viewed by 1300
Abstract
The paper presents the results concerning the influence of the thickness of the ITO and In2O3 layers deposited by the magnetron sputtering method on the physical parameters characterising their surface properties. The characterisation parameters were obtained by atomic force microscopy [...] Read more.
The paper presents the results concerning the influence of the thickness of the ITO and In2O3 layers deposited by the magnetron sputtering method on the physical parameters characterising their surface properties. The characterisation parameters were obtained by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and Kelvin probe. The increase in the layers’ thickness related to the time of their fabrication causes an increase in the surface roughness and the value of the work function, followed by a decrease in the concentration of elements and compounds in the near-surface area. Full article
(This article belongs to the Special Issue Two-Dimensional Materials and Nano Devices)
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10 pages, 1484 KiB  
Article
Morphology-Dependent Optoelectronic Properties of Pentacene Nanoribbon and Nanosheet Crystallite
by Zhifeng Wang, Yuquan Gan, Qianqian Du, Shuhong Li, Yunlong Liu and Wenjun Wang
Materials 2023, 16(2), 557; https://doi.org/10.3390/ma16020557 - 06 Jan 2023
Viewed by 1106
Abstract
Organic, single crystals have emerged as unique optoelectrical materials due to their highly ordered structure and low defects. In this work, pentacene nanoribbons and nanosheets were selectively fabricated by controlling their growth temperature. The results show that their photoluminescence (PL) activity and electrical [...] Read more.
Organic, single crystals have emerged as unique optoelectrical materials due to their highly ordered structure and low defects. In this work, pentacene nanoribbons and nanosheets were selectively fabricated by controlling their growth temperature. The results show that their photoluminescence (PL) activity and electrical properties were strongly dependent on their geometrical morphology and molecular stacking mode such as the degree of π-orbital overlap and intermolecular interaction. The pentacene nanoribbon crystal exhibited a higher PL intensity compared with the nanosheet configuration; conversely, its electrical conductivity was poor. The low-temperature PL measurement indicated that there are stronger π–π stacking interactions in the nanosheet crystal than in the nanoribbon crystal, leading to exciton quenching and higher conductivity. Our study demonstrated that a unique optoelectronic property of organic crystals can be obtained by controlling the crystal’s morphology, which offers potential guidance for the future design and development of organic crystal optoelectronics. Full article
(This article belongs to the Special Issue Two-Dimensional Materials and Nano Devices)
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Review

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27 pages, 10252 KiB  
Review
Metal Chalcogenide–Hydroxide Hybrids as an Emerging Family of Two-Dimensional Heterolayered Materials: An Early Review
by Yuri Mikhlin, Maxim Likhatski, Roman Borisov, Denis Karpov and Sergey Vorobyev
Materials 2023, 16(19), 6381; https://doi.org/10.3390/ma16196381 - 24 Sep 2023
Cited by 1 | Viewed by 1061
Abstract
Two-dimensional (2D) materials and phenomena attract huge attention in modern science. Herein, we introduce a family of layered materials inspired by the minerals valleriite and tochilinite, which are composed of alternating “incompatible”, and often incommensurate, quasi-atomic sheets of transition metal chalcogenide (sulfides and [...] Read more.
Two-dimensional (2D) materials and phenomena attract huge attention in modern science. Herein, we introduce a family of layered materials inspired by the minerals valleriite and tochilinite, which are composed of alternating “incompatible”, and often incommensurate, quasi-atomic sheets of transition metal chalcogenide (sulfides and selenides of Fe, Fe-Cu and other metals) and hydroxide of Mg, Al, Fe, Li, etc., stacked via electrostatic interaction rather than van der Waals forces. We survey the data available on the composition and structure of the layered minerals, laboratory syntheses of such materials and the effect of reaction conditions on the phase purity, morphology and composition of the products. The spectroscopic results (Mössbauer, X-ray photoelectron, X-ray absorption, Raman, UV-vis, etc.), physical (electron, magnetic, optical and some others) characteristics, a specificity of thermal behavior of the materials are discussed. The family of superconductors (FeSe)·(Li,Fe)(OH) having a similar layered structure is briefly considered too. Finally, promising research directions and applications of the valleriite-type substances as a new class of prospective multifunctional 2D materials are outlined. Full article
(This article belongs to the Special Issue Two-Dimensional Materials and Nano Devices)
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