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Molecules
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Two-Dimensional Materials: From Synthesis to Applications, 2nd Edition
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Two-Dimensional Materials: From Synthesis to Applications, 2nd Edition

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: 30 April 2025 | Viewed by 1673

Special Issue Editors

Dr. Sake Wang

E-Mail Website
Guest Editor
College of Science, Jinling Institute of Technology, Nanjing 211169, China
Interests: 2D materials; environment; valleytronics; spintronics; topological insulators; electron transport; optoelectronics; photocatalyst
Special Issues, Collections and Topics in MDPI journals
Dr. Nguyen Tuan Hung

E-Mail Website
Guest Editor
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-0845, Miyagi, Japan
Interests: thermoelectricity; artificial muscles; nanomechanics; first-principles calculations
Special Issues, Collections and Topics in MDPI journals
Dr. Minglei Sun

E-Mail Website
Guest Editor
NANOlab Center of Excellence, Department of Physics, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
Interests: computational investigation of materials for energy applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Since the discovery of graphene, two-dimensional (2D) materials have become the focus of nanoscience and materials science. The large surface-to-volume ratio, tunable surface properties, and outstanding physical and chemical properties of 2D materials have triggered intensive investigations. The synthesis of high-quality and large-scale 2D materials, as well as the exploration of their applications, including nanoelectronics, catalysts, sensors, bio-applications, and energy conversion and storage, will advance scientific research and facilitate commercial development. In this issue, we focus on the synthesis and applications of existing and newly predicted 2D materials, including, but not limited to, the following topics:

  • Synthesis of high-quality and large-scale 2D materials by physical and chemical approaches;
  • Synthesis and prediction of novel 2D materials, including van der Waals and moiré heterostructures;
  • Fundamental understanding and modulation of surface and chemical properties;
  • Synthesis and basic properties of 2D-material-based heterostructures and other architectures;
  • Applications including high-performance nanoelectronics, catalysts, photocatalysts, photovoltaics, batteries, supercapacitors, sensors, bio-applications, etc.

As showcased in this Special Issue, 2D materials exhibit a wide range of new and unusual properties that can be employed to fabricate improved and novel electronic and electro-optical devices. We look forward to receiving your contributions.

Dr. Sake Wang
Dr. Nguyen Tuan Hung
Dr. Minglei Sun
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 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. Molecules 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 2700 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 materials
  • graphene
  • transition-metal dichalcogenides
  • spintronics
  • valleytronics
  • twistronics
  • plasmonics
  • photonics

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Related Special Issue

Published Papers (3 papers)

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Research

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12 pages, 4376 KiB  
Article
High-Quality Epitaxial Cobalt-Doped GaN Nanowires on Carbon Paper for Stable Lithium-Ion Storage
by Peng Wu, Xiaoguang Wang, Danchen Wang, Yifan Wang, Qiuju Zheng, Tailin Wang, Changlong Sun, Dan Liu, Fuzhou Chen and Sake Wang
Molecules 2024, 29(22), 5428; https://doi.org/10.3390/molecules29225428 - 18 Nov 2024
Viewed by 351
Abstract
Due to its distinctive structure and unique physicochemical properties, gallium nitride (GaN) has been considered a prospective candidate for lithium storage materials. However, its inferior conductivity and unsatisfactory cycle performance hinder the further application of GaN as a next-generation anode material for lithium-ion [...] Read more.
Due to its distinctive structure and unique physicochemical properties, gallium nitride (GaN) has been considered a prospective candidate for lithium storage materials. However, its inferior conductivity and unsatisfactory cycle performance hinder the further application of GaN as a next-generation anode material for lithium-ion batteries (LIBs). To address this, cobalt (Co)-doped GaN (Co-GaN) nanowires have been designed and synthesized by utilizing the chemical vapor deposition (CVD) strategy. The structural characterizations indicate that the doped Co elements in the GaN nanowires exist as Co2+ rather than metallic Co. The Co2+ prominently promotes electrical conductivity and ion transfer efficiency in GaN. The cycling capacity of Co-GaN reached up to 495.1 mA h g−1 after 100 cycles. After 500 cycles at 10 A g−1, excellent cycling capacity remained at 276.6 mA h g−1. The intimate contact between Co-GaN nanowires and carbon paper enhances the conductivity of the composite. Density functional theory (DFT) calculations further illustrated that Co substitution changed the electron configuration in the GaN, which led to enhancement of the electron transfer efficiency and a reduction in the ion diffusion barrier on the Co-GaN electrode. This doping design boosts the lithium-ion storage performance of GaN as an advanced material in lithium-ion battery anodes and in other electrochemical applications. Full article
(This article belongs to the Special Issue Two-Dimensional Materials: From Synthesis to Applications, 2nd Edition)
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13 pages, 3968 KiB  
Article
Insight into the Local Surface Plasmon Resonance Effect of Pt-SnS2 Nanosheets in Tetracycline Photodegradation
by Mao Feng, Tianhao Zhou, Jiaxin Li, Mengqing Cao, Jing Cheng, Danyang Li, Jian Qi and Feifei You
Molecules 2024, 29(22), 5423; https://doi.org/10.3390/molecules29225423 - 17 Nov 2024
Viewed by 442
Abstract
Constructing highly efficient catalysts for the degradation of organic pollutants driven by solar light in aquatic environments is a promising and green strategy. In this study, a novel hexagonal sheet-like Pt/SnS2 heterojunction photocatalyst is successfully designed and fabricated using a hydrothermal method [...] Read more.
Constructing highly efficient catalysts for the degradation of organic pollutants driven by solar light in aquatic environments is a promising and green strategy. In this study, a novel hexagonal sheet-like Pt/SnS2 heterojunction photocatalyst is successfully designed and fabricated using a hydrothermal method and photodeposition process for photocatalytic tetracycline (TC) degradation. The optimal Pt/SnS2 hybrid behaves with excellent photocatalytic performance, with a degradation efficiency of 91.27% after 120 min, a reaction rate constant of 0.0187 min−1, and durability, which can be attributed to (i) the formation of a metal/semiconductor interface field caused by loading Pt nanoparticles (NPs) on the surface of SnS2, facilitating the separation of photo-induced charge carriers; (ii) the local surface plasmon resonance (LSPR) effect of Pt NPs, extending the light absorption range; and (iii) the sheet-like structure of SnS2, which can shorten the transmission distance of charge carriers, thereby allowing more electrons (e−) and holes (h+) to transfer to the surface of the catalyst. This work provides new insights with the utilization of sheet-like structured materials for highly active photocatalytic TC degradation in wastewater treatment and environmental remediation. Full article
(This article belongs to the Special Issue Two-Dimensional Materials: From Synthesis to Applications, 2nd Edition)
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Review

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31 pages, 7065 KiB  
Review
NMR Relaxation to Probe Zeolites: Mobility of Adsorbed Molecules, Surface Acidity, Pore Size Distribution and Connectivity
by Marina G. Shelyapina
Molecules 2024, 29(22), 5432; https://doi.org/10.3390/molecules29225432 - 18 Nov 2024
Viewed by 568
Abstract
Unique structural and chemical properties, such as ion exchange, developed inner surface, etc., as well as the wide possibilities and flexibility of regulating these properties, cause a keen interest in zeolites. They are widely used in industry as molecular sieves, ion exchangers and [...] Read more.
Unique structural and chemical properties, such as ion exchange, developed inner surface, etc., as well as the wide possibilities and flexibility of regulating these properties, cause a keen interest in zeolites. They are widely used in industry as molecular sieves, ion exchangers and catalysts. Current trends in the development of zeolite-based catalysts include the adaptation of their cationic composition, acidity and porosity for a specific catalytic process. Recent studies have shown that mesoporosity is beneficial to the rational design of catalysts with controlled product selectivity and an improved catalyst lifetime due to its efficient mass-transport properties. Nuclear magnetic resonance (NMR) has proven to be a reliable method for studying zeolites. Solid-state NMR spectroscopy allows for the quantification of both Lewis and Brønsted acidity in zeolite catalysts and, nowadays, 27Al and 29Si magic angle spinning NMR spectroscopy has become firmly established in the set of approved methods for characterizing zeolites. The use of probe molecules opens up the possibility for the indirect measurement of the characteristics of acid sites. NMR relaxation is less common, although it is especially informative and enlightening for studying the mobility of guest molecules in the porous matrix. Moreover, the NMR relaxation of guest molecules and NMR cryoporometry can quantify pore size distribution on a broader scale (compared to traditional methods), which is especially important for systems with complex pore organization. Over the last few years, there has been a growing interest in the use of 2D NMR relaxation techniques to probe porous catalysts, such as 2D T1–T2 correlation to study the acidity of the surface of catalysts and 2D T2–T2 exchange to study pore connectivity. This contribution provides a comprehensive review of various NMR relaxation techniques for studying porous media and recent results of their applications in probing micro- and mesoporous zeolites, mainly focused on the mobility of adsorbed molecules, the acidity of the zeolite surface and the pore size distribution and connectivity of zeolites with hierarchical porosity. Full article
(This article belongs to the Special Issue Two-Dimensional Materials: From Synthesis to Applications, 2nd Edition)
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