Special Issue "2D Materials-Based Thin Films and Coatings"

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Thin Films".

Deadline for manuscript submissions: 30 September 2022 | Viewed by 1725

Special Issue Editor

Prof. Dr. Cristian Vacacela Gomez
E-Mail Website
Guest Editor
School of Physical Sciences and Nanotechnology, Yachay Tech University, Urcuquí EC-100119, Ecuador
Interests: graphene synthesis and characterization; graphene plasmonics; graphene coatings; pollutants removal; 2D materials experiments and modeling, DFT

Special Issue Information

Dear Colleagues,

Since its initial isolation in 2004, graphene has attracted much attention, as a result of its outstanding properties and promising applications; however, the high diameter/thickness ratio, perfect water and oxygen blocking properties, ionic impermeability, and chemical stability of graphene-based materials are gradually emerging as properties that are being scrutinized and exploited. The nano-barrier effect observed in graphene greatly benefits the building of an internal labyrinth effect, to extend the infiltration path of corrosive media, which assists in producing novel protective coatings with interesting features, such as low loading of the inorganic component, lightweight, unique mechanical properties, corrosion resistance, and weather resistance. However, the application of graphene-based materials is restricted by their large-scale, stable, non-destructive dispersion, and their compatibility with resin interfaces; these properties limit their implementation, for instance, in the field of anticorrosive coatings.

To address the issues mentioned, a clear understanding of the state of the art of useful thin films and coatings, based on graphene or related two-dimensional (2D) materials, is necessary to devise countermeasures and solutions. With this in mind, the related 2D materials that are currently considered as promising thin films and coatings include the following: graphene oxide, molybdenum disulfide, boron nitride, mica, zirconium phosphate, layered hydrotalcite, the MXene family, carbon nitride, amongst others.  

This Special Issue is expected to serve as a forum for papers in the following concepts:

  • Recent developments in multi-functional graphene-based coatings;
  • Theoretical and experimental research, and new ideas in protective and preventive coating mechanisms using beyond-graphene materials;
  • Coatings or thin films produced by different processes as additive manufacturing processes, thermal spray, laser and plasma processing, CVD, plating, etc.;
  • Coatings with exposure to high temperatures, high stress, and other extreme environment applications;
  • Understanding the degradation mechanisms of coatings through friction, wear or other dynamic loading conditions, and corrosion;
  • Modeling and simulation to predict coating properties, performance, durability, and reliability.

Prof. Dr. Cristian Vacacela Gomez
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. Coatings 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 2000 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-based coatings
  • two-dimensional nanomaterials
  • anticorrosive coatings
  • performance and reliability modeling
  • multifunctional nanostructured materials

Published Papers (4 papers)

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Research

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Communication
Adsorption Kinetics of Hg(II) on Eco-Friendly Prepared Oxidized Graphenes
Coatings 2022, 12(8), 1154; https://doi.org/10.3390/coatings12081154 - 10 Aug 2022
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Abstract
Extra-functionalized oxidized graphenes are widely preferred for the removal of different pollutants, however, removal with pristine oxidized graphenes, i.e., graphene oxide (GO) and reduced graphene oxide (rGO) is vaguely explored. Herein, we report a comparative adsorption kinetics study of the removal of mercury(II) [...] Read more.
Extra-functionalized oxidized graphenes are widely preferred for the removal of different pollutants, however, removal with pristine oxidized graphenes, i.e., graphene oxide (GO) and reduced graphene oxide (rGO) is vaguely explored. Herein, we report a comparative adsorption kinetics study of the removal of mercury(II) (Hg(II)) from water using eco-friendly prepared GO and rGO. This work consists of the synthesis protocol and the corresponding morphological and spectroscopical characterization of the obtained pristine adsorbents as well as the adsorption mechanism in terms of initial concentration, removal percentage, pseudo-first and pseudo-second-order models, intraparticle diffusion study, and pH analysis. In particular, scanning electron microscope (SEM) and transmission electron microscope (TEM) images evidence the presence of thin sheets with some defects on the GO structure, these defects substantially disappear in rGO, after reduction. Raman spectrum of rGO shows a less intense D* peak which is attributed to the diamond-like carbon phase. Most importantly, the equilibrium adsorption time in GO is 10 min with a removal percentage of ~28% while in rGO it is 20 min with a removal percentage of ~75%. The adsorption process of Hg(II) either in GO or rGO is more in line with the pseudo-second-order model, suggesting that the adsorption kinetics could be controlled by chemisorption. Our results evidence the interesting adsorbing properties of pristine oxidized graphenes and are expected to be useful for the proposal and study of non-extra functionalized graphene-based materials for water treatment. Full article
(This article belongs to the Special Issue 2D Materials-Based Thin Films and Coatings)
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Article
Three-Dimensional Construction Method for Two-Dimensional Film Pattern Design in Sustainable Rhinoceros Skin Coating Technology
Coatings 2022, 12(8), 1132; https://doi.org/10.3390/coatings12081132 - 05 Aug 2022
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Abstract
In order to effectively save material- and time-related costs in sustainable rhinoceros skin lacquering technology, a three-dimensional construction method is developed based on optical microscope tomography and computer image recognition technology. By analyzing the influence of the underlying twisting method, the number of [...] Read more.
In order to effectively save material- and time-related costs in sustainable rhinoceros skin lacquering technology, a three-dimensional construction method is developed based on optical microscope tomography and computer image recognition technology. By analyzing the influence of the underlying twisting method, the number of lacquer layers and the grinding process, the pattern presentation process of rhinoceros skin lacquer is shown in three-dimensional space, and the relationship between pattern style and process flow is further revealed. Computer-aided technology can design and simulate the presentation of the pattern in virtual space, providing a priori guidance for the production of rhinoceros skin lacquerware and new ideas for the innovation of process methods. Full article
(This article belongs to the Special Issue 2D Materials-Based Thin Films and Coatings)
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Article
Fundamental Properties of Transition-Metals-Adsorbed Germanene: A DFT Study
Coatings 2022, 12(7), 948; https://doi.org/10.3390/coatings12070948 - 04 Jul 2022
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Abstract
The transition metal (TM)-absorbed germanene systems enriched by strong chemical bonding are investigated using first-principles calculations. Dedicated calculations include the geometry, preferable adsorption sites, atom-dominated band structure, spin–density distributions, spatial charge distribution, and the projected density of states (DOS). The strong multi-orbital chemical [...] Read more.
The transition metal (TM)-absorbed germanene systems enriched by strong chemical bonding are investigated using first-principles calculations. Dedicated calculations include the geometry, preferable adsorption sites, atom-dominated band structure, spin–density distributions, spatial charge distribution, and the projected density of states (DOS). The strong multi-orbital chemical bonds between TMs and Ge atoms can create seriously buckled structures and a non-uniform chemical environment, which are responsible for the unusual electronic properties. Of the three chosen systems, the Fe–Ge and Co–Ge ones possess magnetic properties, while the Ni–Ge system exhibits non-magnetic behavior. The orbital-hybridization-induced characteristics are revealed in van Hove singularities of the DOS. Full article
(This article belongs to the Special Issue 2D Materials-Based Thin Films and Coatings)
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Review

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Review
Perovskite Solar Cells: A Review of the Recent Advances
Coatings 2022, 12(8), 1089; https://doi.org/10.3390/coatings12081089 - 31 Jul 2022
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Abstract
Perovskite solar cells (PSC) have been identified as a game-changer in the world of photovoltaics. This is owing to their rapid development in performance efficiency, increasing from 3.5% to 25.8% in a decade. Further advantages of PSCs include low fabrication costs and high [...] Read more.
Perovskite solar cells (PSC) have been identified as a game-changer in the world of photovoltaics. This is owing to their rapid development in performance efficiency, increasing from 3.5% to 25.8% in a decade. Further advantages of PSCs include low fabrication costs and high tunability compared to conventional silicon-based solar cells. This paper reviews existing literature to discuss the structural and fundamental features of PSCs that have resulted in significant performance gains. Key electronic and optical properties include high electron mobility (800 cm2/Vs), long diffusion wavelength (>1 μm), and high absorption coefficient (105 cm−1). Synthesis methods of PSCs are considered, with solution-based manufacturing being the most cost-effective and common industrial method. Furthermore, this review identifies the issues impeding PSCs from large-scale commercialisation and the actions needed to resolve them. The main issue is stability as PSCs are particularly vulnerable to moisture, caused by the inherently weak bonds in the perovskite structure. Scalability of manufacturing is also a big issue as the spin-coating technique used for most laboratory-scale tests is not appropriate for large-scale production. This highlights the need for a transition to manufacturing techniques that are compatible with roll-to-roll processing to achieve high throughput. Finally, this review discusses future innovations, with the development of more environmentally friendly lead-free PSCs and high-efficiency multi-junction cells. Overall, this review provides a critical evaluation of the advances, opportunities and challenges of PSCs. Full article
(This article belongs to the Special Issue 2D Materials-Based Thin Films and Coatings)
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