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Nanomaterials
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New Insights into Two-Dimensional (2D) Transition Metal Materials
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New Insights into Two-Dimensional (2D) Transition Metal Materials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Inorganic Materials and Metal-Organic Frameworks".

Deadline for manuscript submissions: closed (21 August 2023) | Viewed by 3090

Special Issue Editors

Prof. Dr. Masahiro Yoshimura

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan
Interests: materials chemistry; solid-state chemistry; ceramics
Prof. Dr. Yu-Ze Chen

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701401, Taiwan
Interests: two dimensional material
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Since graphene was discovered, various 2D materials (graphene oxides, MXenes, metal chalcogenides, and their hybrids, composites, etc.) have been studied because they have quite a wide range of interesting properties. Therefore, they have been expected to find applications in electronics, photonics, electrophotonics, sensors, capacitors, catalysis, and biomedicine. These 2D materials can be deposited as films and laminated on various substrates via dry or wet conditions.

The present Special Issue of Nanomaterials aims to collect articles in order to gain new insight and identify new horizons of these 2D materials. Topics of interest include 1) the synthesis and fabrication of new 2D materials; 2) characterization; 3) properties; 4) integration and assembly into homogeneous and/or heterogeneous layers; 5) device formation; 6) function and application in various conditions; and 6) theoretical analysis and simulation; among others. We expect to collect not only original research papers but also critical/prospective review papers. We also welcome and encourage early-career authors to submit their works to this Special Issue.

Prof. Dr. Masahiro Yoshimura
Prof. Dr. Yu-Ze Chen
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. Nanomaterials 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 2900 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

  • 2D materials
  • graphene
  • MXenes
  • chalcogenides
  • layered oxides
  • hydroxide
  • synthesis
  • properties
  • film
  • lamination

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Published Papers (3 papers)

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Research

11 pages, 1632 KiB  
Article
Continuous Production of Functionalized Graphene Inks by Soft Solution Processing
by Kodepelly Sanjeeva Rao, Jaganathan Senthilnathan, Jyh-Ming Ting and Masahiro Yoshimura
Nanomaterials 2023, 13(14), 2043; https://doi.org/10.3390/nano13142043 - 11 Jul 2023
Viewed by 1367
Abstract
The continuous production of high-quality, few-layer graphene nanosheets (GNSs) functionalized with nitrogen-containing groups was achieved via a two-stage reaction method. The initial stage produces few-layer GNSs by utilizing our recently developed glycine-bisulfate ionic complex-assisted electrochemical exfoliation of graphite. The second stage, developed here, [...] Read more.
The continuous production of high-quality, few-layer graphene nanosheets (GNSs) functionalized with nitrogen-containing groups was achieved via a two-stage reaction method. The initial stage produces few-layer GNSs by utilizing our recently developed glycine-bisulfate ionic complex-assisted electrochemical exfoliation of graphite. The second stage, developed here, uses a radical initiator and nitrogen precursor (azobisisobutyronitrile) under microwave conditions in an aqueous solution for the efficient nitrogen functionalization of the initially formed GNSs. These nitrile radical reactions have great advantages in green chemistry and soft processing. Raman spectra confirm the insertion of nitrogen functional groups into nitrogen-functionalized graphene (N-FG), whose disorder is higher than that of GNSs. X-ray photoelectron spectra confirm the insertion of edge/surface nitrogen functional groups. The insertion of nitrogen functional groups is further confirmed by the enhanced dispersibility of N-FG in dimethyl formamide, ethylene glycol, acetonitrile, and water. Indeed, after the synthesis of N-FG in solution, it is possible to disperse N-FG in these liquid dispersants just by a simple washing–centrifugation separation–dispersion sequence. Therefore, without any drying, milling, and redispersion into liquid again, we can produce N-FG ink with only solution processing. Thus, the present work demonstrates the ‘continuous solution processing’ of N-FG inks without complicated post-processing conditions. Furthermore, the formation mechanism of N-FG is presented. Full article
(This article belongs to the Special Issue New Insights into Two-Dimensional (2D) Transition Metal Materials)
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20 pages, 6875 KiB  
Article
Two-Dimensional Metal-Organic Framework Incorporated Highly Polar PVDF for Dielectric Energy Storage and Mechanical Energy Harvesting
by Abhishek Sasmal, Jaganathan Senthilnathan, Arunachalakasi Arockiarajan and Masahiro Yoshimura
Nanomaterials 2023, 13(6), 1098; https://doi.org/10.3390/nano13061098 - 19 Mar 2023
Cited by 22 | Viewed by 2758
Abstract
Here, we introduce a 2D metal-organic framework (MOF) into the poly(vinylidene fluoride) (PVDF) matrix, which has been comparatively less explored in this field. Highly 2D Ni-MOF has been synthesized in this regard via hydrothermal route and has been incorporated into PVDF matrix via [...] Read more.
Here, we introduce a 2D metal-organic framework (MOF) into the poly(vinylidene fluoride) (PVDF) matrix, which has been comparatively less explored in this field. Highly 2D Ni-MOF has been synthesized in this regard via hydrothermal route and has been incorporated into PVDF matrix via solvent casting technique with ultralow filler (0.5 wt%) loading. The polar phase percentage of 0.5 wt% Ni-MOF loaded PVDF film (NPVDF) has been found to be increased to ~85% from a value of ~55% for neat PVDF. The ultralow filler loading has inhibited the easy breakdown path along with increased dielectric permittivity and hence has enhanced the energy storage performance. On the other hand, significantly enriched polarity and Young’s Modulus has helped in improving its mechanical energy harvesting performance, thereby enhancing the human motion interactive sensing activities. The piezoelectric and piezo-tribo hybrid devices made up of NPVDF film have shown improved output power density of ~3.26 and 31 μW/cm2 compared to those of the piezoelectric and piezo-tribo hybrid devices comprising of neat PVDF (output power density ~0.6 and 17 μW/cm2, respectively). The developed composite can thus be considered an excellent candidate for multifunctional applications. Full article
(This article belongs to the Special Issue New Insights into Two-Dimensional (2D) Transition Metal Materials)
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12 pages, 6119 KiB  
Article
In Situ Formation of CoS2 Hollow Nanoboxes via Ion-Exchange for High-Performance Microwave Absorption
by Dongwei Xu, Huanhuan Guo, Feifan Zhang, Yanmei Wu, Xiaoqin Guo, Yumei Ren and Desheng Feng
Nanomaterials 2022, 12(16), 2876; https://doi.org/10.3390/nano12162876 - 21 Aug 2022
Cited by 7 | Viewed by 1848
Abstract
Hollow nanoboxes structure have raised great attention as microwave absorption materials on account of their ultralow density and large specific area. By introducing an adjustable interior cavity structure, the dielectric loss and microwave absorption performance were affected by the tunable complex permittivity and [...] Read more.
Hollow nanoboxes structure have raised great attention as microwave absorption materials on account of their ultralow density and large specific area. By introducing an adjustable interior cavity structure, the dielectric loss and microwave absorption performance were affected by the tunable complex permittivity and impedance matching was improved. In our study, hollow CoS2 nanoboxes with designable interspaces were successfully fabricated based on the surfactant-assisted solution method and followed by an in situ ion-exchange process. The structure, elemental compositions and morphology of the products were characterized by XRD, XPS, EDX, SEM and TEM, respectively. In addition, microwave absorption performance and the intrinsic mechanism are investigated in-depth. The paraffin-based composites with 20 wt.% filling contents exhibited superior microwave absorption capacities in view of both maximum reflection loss value (RLmax, −54.48 dB) and effective absorption bandwidth (EAB, below −10 dB, 6.0 GHz), which can be ascribed to unique hollow structure and good impedance matching. With these considerations in mind, this study provides a reference for the construction of high-performance microwave absorbers with unique hollow structure. Full article
(This article belongs to the Special Issue New Insights into Two-Dimensional (2D) Transition Metal Materials)
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