Special Issue "Synthesis, Structure and Applications of 2D Nanomaterials"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (15 May 2018)

Special Issue Editors

Guest Editor
Prof. Dr. Stefano Agnoli

Department Chemistry Science, University of Padua, Via Marzolo 1, I-35131 Padua, Italy
Website | E-Mail
Interests: surface science; thin films; metal organic frameworks; 2D materials; oxide nanostructures; chemical vapour deposition; heterogeneous catalysis; electrocatalysis
Guest Editor
Prof. Dr. Yanfeng Zhang

Center for Nanochemistry at Peking University; Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing University
Website | E-Mail
Interests: Her research interest relates to the controlled growth, accurate characterization and novel property exploration of two dimensional layered materials including graphene, h-BN-graphene heterostructures, and transition metal dichalcogenides (TMDCs) and their heterostructures. Recently, her research interest also turns to the applications of such 2D systems in energy related fields.

Special Issue Information

Dear Colleagues:

In the last decade, graphene has been the material with the largest impact on materials science. However, it is only a forerunner to the larger family of 2D materials that has gradually made its presence felt in several different disciplines. Today, scientists have at their disposal, an entire zoology of materials with quite different properties, ranging from metals to semiconductors, from atomic crystals to 2D composite layers with complex stoichiometry, and from highly inert compounds to exceptionally active catalysts. This has kindled intense and extremely varied research activities encompassing both fundamental studies and technological applications.

The reason for the undeniable charm of 2D materials can be traced back to their exceptional functional capabilities: The 2D topology imparts them with unusual electronic and optical properties that have yet to be fully investigated and comprehended. Moreover, it is now quite evident that the rational combination of different 2D materials can lead to a new class of artificial solids that exhibit totally new properties, quite different from those of the composing units.

This Special Issue is devoted to the latest advancements in the field of 2D materials, with a special focus on the synthesis methods of novel 2D materials and their nanocomposites, on the advanced characterization of their special electronic, optical and chemical properties, and on the emerging applications in several technological fields encompassing catalysis, microelectronics, sensors, and energy conversion.

This Special Issue is open to original research articles, as well as review articles, that can help to outline the current status of research on 2D materials and its coming future.  

Prof. Dr. Stefano Agnoli
Prof. Dr. Yanfeng Zhang
Guest Editors

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 papers will be 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. Nanomaterials is an international peer-reviewed open access monthly 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 1500 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

  • Graphene and chemically modified graphenes
  • Transition metal dichalcogenides
  • Silicene, germanene, stannene/silicane and germanane
  • Mxenes
  • Phosphorene
  • 2D topological insulators
  • two dimensional oxides, carbides and nitrides
  • electrochemistry
  • catalysis
  • photoactivity
  • synthesis and functionalization
  • nanocomposites and heterostructures

Published Papers (9 papers)

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Research

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Open AccessArticle Nature of Excitons in Bidimensional WSe2 by Hybrid Density Functional Theory Calculations
Nanomaterials 2018, 8(7), 481; https://doi.org/10.3390/nano8070481
Received: 7 June 2018 / Revised: 27 June 2018 / Accepted: 27 June 2018 / Published: 29 June 2018
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Abstract
2D tungsten diselenide (2D-WSe2) is one of the most successful bidimensional materials for optoelectronic and photonic applications, thanks to its strong photoluminescence properties and to a characteristic large exciton binding energy. Although these optical properties are widely recognized by the scientific
[...] Read more.
2D tungsten diselenide (2D-WSe2) is one of the most successful bidimensional materials for optoelectronic and photonic applications, thanks to its strong photoluminescence properties and to a characteristic large exciton binding energy. Although these optical properties are widely recognized by the scientific community, there is no general understanding of the atomistic details of the excitonic species giving rise to them. In this work, we present a density functional theory investigation of excitons in 2D-WSe2, where we compare results obtained by standard generalized gradient approximation (GGA) methods (including spin-orbit coupling) with those by hybrid density functionals. Our study provides information on the size of the self-trapped exciton, the number and type of atoms involved, the structural reorganization, the self-trapping energy, and the photoluminescence energy, whose computed value is in good agreement with experimental measurements in the literature. Moreover, based on the comparative analysis of the self-trapping energy for the exciton with that for isolated charge carriers (unbound electrons and holes), we also suggest a simplified approach for the theoretical estimation of the excitonic binding energy, which can be compared with previous estimates from different approaches or from experimental data. Full article
(This article belongs to the Special Issue Synthesis, Structure and Applications of 2D Nanomaterials)
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Open AccessArticle Aerosol Synthesis of N and N-S Doped and Crumpled Graphene Nanostructures
Nanomaterials 2018, 8(6), 406; https://doi.org/10.3390/nano8060406
Received: 15 May 2018 / Revised: 29 May 2018 / Accepted: 30 May 2018 / Published: 6 June 2018
Cited by 1 | PDF Full-text (12523 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Chemically modified graphene–based materials (CMG) are currently attracting a vast interest in their application in different fields. In particular, heteroatom-doped graphenes have revealed great potentialities in the field of electrocatalysis as substitutes of fuel cell noble metal–based catalysts. In this work, we investigate
[...] Read more.
Chemically modified graphene–based materials (CMG) are currently attracting a vast interest in their application in different fields. In particular, heteroatom-doped graphenes have revealed great potentialities in the field of electrocatalysis as substitutes of fuel cell noble metal–based catalysts. In this work, we investigate an innovative process for doping graphene nanostructures. We optimize a novel synthetic route based on aerosol preparation, which allows the simultaneous doping, crumpling, and reduction of graphene oxide (GO). Starting from aqueous solutions containing GO and the dopant precursors, we synthesize N- and N,S-dual-doped 3D graphene nanostructures (N-cGO and N,S-cGO). In the aerosol process, every aerosol droplet can be considered as a microreactor where dopant precursors undergo thermal decomposition and react with the GO flakes. Simultaneously, thanks to the relatively high temperature, GO undergoes crumpling and partial reduction. Using a combination of spectroscopic and microscopic characterization techniques, we investigate the morphology of the obtained materials and the chemical nature of the dopants within the crumpled graphene sheets. This study highlights the versatility of the aerosol process for the design of new CMG materials with tailored electrocatalytic properties. Full article
(This article belongs to the Special Issue Synthesis, Structure and Applications of 2D Nanomaterials)
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Open AccessArticle Self-Assembled Ag-Cu2O Nanocomposite Films at Air-Liquid Interfaces for Surface-Enhanced Raman Scattering and Electrochemical Detection of H2O2
Nanomaterials 2018, 8(5), 332; https://doi.org/10.3390/nano8050332
Received: 22 April 2018 / Revised: 8 May 2018 / Accepted: 8 May 2018 / Published: 15 May 2018
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Abstract
We employ a facile and novel route to synthesize multifunctional Ag-Cu2O nanocomposite films through the self-assembly of nanoparticles at an air-liquid interface. In the ethanol-water phase, AgNO3 and Cu(NO3)2 were reduced to Ag-Cu2O nanoparticles by
[...] Read more.
We employ a facile and novel route to synthesize multifunctional Ag-Cu2O nanocomposite films through the self-assembly of nanoparticles at an air-liquid interface. In the ethanol-water phase, AgNO3 and Cu(NO3)2 were reduced to Ag-Cu2O nanoparticles by NaBH4 in the presence of cinnamic acid. The Ag-Cu2O nanoparticles were immediately trapped at the air-liquid interface to form two-dimensional nanocomposite films after the reduction reaction was finished. The morphology of the nanocomposite films could be controlled by the systematic regulation of experimental parameters. It was found that the prepared nanocomposite films serving as the substrates exhibited strong surface-enhanced Raman scattering (SERS) activity. 4-aminothiophenol (4-ATP) molecules were used as the test probes to examine the SERS sensitivity of the nanocomposite films. Moreover, the nanocomposite films synthesized by our method showed enhanced electrocatalytic activity towards hydrogen peroxide (H2O2) and therefore could be utilized to fabricate a non-enzymatic electrochemical H2O2 sensor. Full article
(This article belongs to the Special Issue Synthesis, Structure and Applications of 2D Nanomaterials)
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Open AccessArticle Transport and Field Emission Properties of MoS2 Bilayers
Nanomaterials 2018, 8(3), 151; https://doi.org/10.3390/nano8030151
Received: 9 February 2018 / Revised: 1 March 2018 / Accepted: 6 March 2018 / Published: 8 March 2018
Cited by 5 | PDF Full-text (2550 KB) | HTML Full-text | XML Full-text
Abstract
We report the electrical characterization and field emission properties of MoS2 bilayers deposited on a SiO2/Si substrate. Current–voltage characteristics are measured in the back-gate transistor configuration, with Ti contacts patterned by electron beam lithography. We confirm the n-type character
[...] Read more.
We report the electrical characterization and field emission properties of MoS 2 bilayers deposited on a SiO 2 / Si substrate. Current–voltage characteristics are measured in the back-gate transistor configuration, with Ti contacts patterned by electron beam lithography. We confirm the n-type character of as-grown MoS 2 and we report normally-on field-effect transistors. Local characterization of field emission is performed inside a scanning electron microscope chamber with piezo-controlled tungsten tips working as the anode and the cathode. We demonstrate that an electric field of ~ 200   V / μ m is able to extract current from the flat part of MoS 2 bilayers, which can therefore be conveniently exploited for field emission applications even in low field enhancement configurations. We show that a Fowler–Nordheim model, modified to account for electron confinement in two-dimensional (2D) materials, fully describes the emission process. Full article
(This article belongs to the Special Issue Synthesis, Structure and Applications of 2D Nanomaterials)
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Open AccessArticle Raman Enhancement and Photo-Bleaching of Organic Dyes in the Presence of Chemical Vapor Deposition-Grown Graphene
Nanomaterials 2017, 7(10), 337; https://doi.org/10.3390/nano7100337
Received: 18 September 2017 / Revised: 10 October 2017 / Accepted: 16 October 2017 / Published: 19 October 2017
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Abstract
Fluorescent organic dyes photobleach under intense light. Graphene has been shown to improve the photo-stability of organic dyes. In this paper, we investigated the Raman spectroscopy and photo-bleaching kinetics of dyes in the absence/presence of chemical vapor deposition (CVD)-grown graphene. We show that
[...] Read more.
Fluorescent organic dyes photobleach under intense light. Graphene has been shown to improve the photo-stability of organic dyes. In this paper, we investigated the Raman spectroscopy and photo-bleaching kinetics of dyes in the absence/presence of chemical vapor deposition (CVD)-grown graphene. We show that graphene enhances the Raman signal of a wide range of dyes. The photo-bleaching of the dyes was reduced when the dyes were in contact with graphene. In contrast, monolayer hexagonal boron nitride (h-BN) was much less effective in reducing the photo-bleaching rate of the dyes. We attribute the suppression of photo-bleaching to the energy or electron transfer from dye to graphene. The results highlight the potential of CVD graphene as a substrate for protecting and enhancing Raman response of organic dyes. Full article
(This article belongs to the Special Issue Synthesis, Structure and Applications of 2D Nanomaterials)
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Review

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Open AccessReview Properties, Preparation and Applications of Low Dimensional Transition Metal Dichalcogenides
Nanomaterials 2018, 8(7), 463; https://doi.org/10.3390/nano8070463
Received: 6 June 2018 / Revised: 22 June 2018 / Accepted: 22 June 2018 / Published: 26 June 2018
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Abstract
Low-dimensional layered transition metal dichalcogenides (TMDs) have recently emerged as an important fundamental research material because of their unique structural, physical and chemical properties. These novel properties make these TMDs a suitable candidate in numerous potential applications. In this review, we briefly summarize
[...] Read more.
Low-dimensional layered transition metal dichalcogenides (TMDs) have recently emerged as an important fundamental research material because of their unique structural, physical and chemical properties. These novel properties make these TMDs a suitable candidate in numerous potential applications. In this review, we briefly summarize the properties of low-dimensional TMDs, and then focus on the various methods used in their preparation. The use of TMDs in electronic devices, optoelectronic devices, electrocatalysts, biosystems, and hydrogen storage is also explored. The cutting-edge future development probabilities of these materials and numerous research challenges are also outlined in this review. Full article
(This article belongs to the Special Issue Synthesis, Structure and Applications of 2D Nanomaterials)
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Open AccessReview Nanostructured Graphene: An Active Component in Optoelectronic Devices
Nanomaterials 2018, 8(5), 328; https://doi.org/10.3390/nano8050328
Received: 11 April 2018 / Revised: 11 May 2018 / Accepted: 12 May 2018 / Published: 14 May 2018
Cited by 1 | PDF Full-text (6395 KB) | HTML Full-text | XML Full-text
Abstract
Nanostructured and chemically modified graphene-based nanomaterials possess intriguing properties for their incorporation as an active component in a wide spectrum of optoelectronic architectures. From a technological point of view, this aspect brings many new opportunities to the now well-known atomically thin carbon sheet,
[...] Read more.
Nanostructured and chemically modified graphene-based nanomaterials possess intriguing properties for their incorporation as an active component in a wide spectrum of optoelectronic architectures. From a technological point of view, this aspect brings many new opportunities to the now well-known atomically thin carbon sheet, multiplying its application areas beyond transparent electrodes. This article gives an overview of fundamental concepts, theoretical backgrounds, design principles, technological implications, and recent advances in semiconductor devices that integrate nanostructured graphene materials into their active region. Starting from the unique electronic nature of graphene, a physical understanding of finite-size effects, non-idealities, and functionalizing mechanisms is established. This is followed by the conceptualization of hybridized films, addressing how the insertion of graphene can modulate or improve material properties. Importantly, it provides general guidelines for designing new materials and devices with specific characteristics. Next, a number of notable devices found in the literature are highlighted. It provides practical information on material preparation, device fabrication, and optimization for high-performance optoelectronics with a graphene hybrid channel. Finally, concluding remarks are made with the summary of the current status, scientific issues, and meaningful approaches to realizing next-generation technologies. Full article
(This article belongs to the Special Issue Synthesis, Structure and Applications of 2D Nanomaterials)
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Open AccessReview A Perspective on the Application of Spatially Resolved ARPES for 2D Materials
Nanomaterials 2018, 8(5), 284; https://doi.org/10.3390/nano8050284
Received: 11 April 2018 / Revised: 20 April 2018 / Accepted: 23 April 2018 / Published: 27 April 2018
Cited by 1 | PDF Full-text (4438 KB) | HTML Full-text | XML Full-text
Abstract
In this paper, a perspective on the application of Spatially- and Angle-Resolved PhotoEmission Spectroscopy (ARPES) for the study of two-dimensional (2D) materials is presented. ARPES allows the direct measurement of the electronic band structure of materials generating extremely useful insights into their electronic
[...] Read more.
In this paper, a perspective on the application of Spatially- and Angle-Resolved PhotoEmission Spectroscopy (ARPES) for the study of two-dimensional (2D) materials is presented. ARPES allows the direct measurement of the electronic band structure of materials generating extremely useful insights into their electronic properties. The possibility to apply this technique to 2D materials is of paramount importance because these ultrathin layers are considered fundamental for future electronic, photonic and spintronic devices. In this review an overview of the technical aspects of spatially localized ARPES is given along with a description of the most advanced setups for laboratory and synchrotron-based equipment. This technique is sensitive to the lateral dimensions of the sample. Therefore, a discussion on the preparation methods of 2D material is presented. Some of the most interesting results obtained by ARPES are reported in three sections including: graphene, transition metal dichalcogenides (TMDCs) and 2D heterostructures. Graphene has played a key role in ARPES studies because it inspired the use of this technique with other 2D materials. TMDCs are presented for their peculiar transport, optical and spin properties. Finally, the section featuring heterostructures highlights a future direction for research into 2D material structures. Full article
(This article belongs to the Special Issue Synthesis, Structure and Applications of 2D Nanomaterials)
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Open AccessReview Recent Advances in Nanoporous Membranes for Water Purification
Nanomaterials 2018, 8(2), 65; https://doi.org/10.3390/nano8020065
Received: 22 December 2017 / Revised: 18 January 2018 / Accepted: 23 January 2018 / Published: 25 January 2018
Cited by 5 | PDF Full-text (4623 KB) | HTML Full-text | XML Full-text
Abstract
Nanoporous materials exhibit wide applications in the fields of electrocatalysis, nanodevice fabrication, energy, and environmental science, as well as analytical science. In this review, we present a summary of recent studies on nanoporous membranes for water purification application. The types and fabrication strategies
[...] Read more.
Nanoporous materials exhibit wide applications in the fields of electrocatalysis, nanodevice fabrication, energy, and environmental science, as well as analytical science. In this review, we present a summary of recent studies on nanoporous membranes for water purification application. The types and fabrication strategies of various nanoporous membranes are first introduced, and then the fabricated nanoporous membranes for removing various water pollutants, such as salt, metallic ions, anions, nanoparticles, organic chemicals, and biological substrates, are demonstrated and discussed. This work will be valuable for readers to understand the design and fabrication of various nanoporous membranes, and their potential purification mechanisms towards different water pollutants. In addition, it will be helpful for developing new nanoporous materials for quick, economic, and high-performance water purification. Full article
(This article belongs to the Special Issue Synthesis, Structure and Applications of 2D Nanomaterials)
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