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Nanomaterials
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Two Dimensional Nanomaterials: Energy Conversion and Storage
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Two Dimensional Nanomaterials: Energy Conversion and Storage

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "2D and Carbon Nanomaterials".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 36273

Special Issue Editor

Prof. Dr. Mihai V. Putz

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Guest Editor
Laboratory of Structural and Computational Physical-Chemistry for Nanosciences and QSAR, Biology-Chemistry Department, West University of Timisoara, Str. Pestalozzi 16, 300115 Timisoara, Romania; and Laboratory of Renewable Energies-Photovoltaics, R&D National Institute for Electrochemistry and Condensed Matter –INCEMC–Timisoara; Str. Dr. Aurel Podeanu 144, 300569 Timișoara, Romania
Interests: quantum nanochemistry, graphenic science and technology, interlocked molecules, functionalized materials, bio-nano-materials; quantum logic, nano-networks; strategic clustering by nanotech
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear colleagues,

The true advent of nano-world was marked by the realization of the surfaces greater than the volume, i.e. from when “the points have surface”. This way the fractalization of matter was perceived as a fully reach potential “at the bottom” of the world, hidden mostly, unexplored, or not designed – yet with huge impact on the main engine of the life cycles in general: the energy production/consume, conversion and storage. While the energy production/consume relates merely win engineering approaches, since the scale-need of energy, its conversion and storage seems to be more on the fundamental scientific part since relaying on baseline phenomena at atomic and molecular level, involved in smart processes in isolated or open environments. Accordingly, the conversion relates with production when about the photovoltaic effect, catalysis, thermoelectric conversion, CO2 caption, for instance; instead, the storage relates with consume when currently focused on H2 storage, condensatos, graphene, fullerenes, nanotubes and batteries; while all together defines what it is called as nanoenergy able to relaunch the Glocal (global-local) economies in the so called second curve of developing by research and innovation. However, the tested nanomaterials are almost invariable experiencing the extreme or exotic surface properties: by coating, by interfaces interaction, surface catalyzes, staking, by folding, when combined in junctions, when are in (even in buried) contact, or when activate their porosity in storage, or in other complex combinations when transform and storage the quantum properties of matter in observable/usable spectra, colors, and information. This special issue is thus dedicated on this 2D nanoworld perspective, from fundamental structure, to energy and allied properties and functions in circular conversion and storage of sustainable nano-surface processes.

Prof. Dr. Mihai V. Putz
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. 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

  • Nano-energy
  • Nano-carbon
  • Nano-silicium
  • Nano-bio-matter
  • Nano-bio-med (including big data and networking analysis)
  • Nano-electronics and devices
  • H2 storage
  • CO2 capture
  • Magnetic nano-materials
  • Quantum transistor
  • Artificial intelligence on nano-surfaces
  • Quantum information technology

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Published Papers (5 papers)

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Research

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11 pages, 1499 KiB  
Article
Synthesis and Properties of Polyimide Silica Nanocomposite Film with High Transparent and Radiation Resistance
by Jindong Huang, Guanglu Zhang, Beiping Dong and Juncheng Liu
Nanomaterials 2021, 11(3), 562; https://doi.org/10.3390/nano11030562 - 24 Feb 2021
Cited by 16 | Viewed by 13272
Abstract
In order to prepare flexible glass cover sheet materials suitable for space solar cells, fluorinated diamine 2,2’-bistrifluoromethyl benzidine (TFDB) and fluorinated dianhydride 4,4’ (hexafluoroisopropyl) diphthalic dianhydride (6FDA) as the monomer, polyimide (PI)/SiO2 composite film was synthesized by in situ polymerization, and the [...] Read more.
In order to prepare flexible glass cover sheet materials suitable for space solar cells, fluorinated diamine 2,2’-bistrifluoromethyl benzidine (TFDB) and fluorinated dianhydride 4,4’ (hexafluoroisopropyl) diphthalic dianhydride (6FDA) as the monomer, polyimide (PI)/SiO2 composite film was synthesized by in situ polymerization, and the influence of coupling agent and SiO2 nanoparticle content on the film structure and properties was studied. The results show that PI synthesized from fluorine-containing monomers has better light transmittance, and the highest transmittance can reach 91.4%. The average visible light transmittance of the composite film decreases with the increase of SiO2 content, and the transmittance of the film decreases less in the high-wavelength region and greatly decreases in the low-wavelength region. The tensile strength and elastic modulus of PI/SiO2 composite film increase with the increase of SiO2 content, first increase and then decrease, reaching the maximum when the content is 10%; while the elongation at break of the composite film gradually increases with the increase of SiO2 content reduce. The thermal stability of PI/SiO2 composite film increases with the increase of SiO2 content. The doping of nano-SiO2 significantly suppresses the influence of irradiation on the mechanical properties of the film. Full article
(This article belongs to the Special Issue Two Dimensional Nanomaterials: Energy Conversion and Storage)
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11 pages, 2667 KiB  
Article
Ultra-Thin SnS2-Pt Nanocatalyst for Efficient Hydrogen Evolution Reaction
by Yanying Yu, Jie Xu, Jianwei Zhang, Fan Li, Jiantao Fu, Chao Li and Cuihua An
Nanomaterials 2020, 10(12), 2337; https://doi.org/10.3390/nano10122337 - 25 Nov 2020
Cited by 16 | Viewed by 2434
Abstract
Transition-metal dichalcogenides (TMDs) materials have attracted much attention for hydrogen evolution reaction (HER) as a new catalyst, but they still have challenges in poor stability and high reaction over-potential. In this study, ultra-thin SnS2 nanocatalysts were synthesized by simple hydrothermal method, and [...] Read more.
Transition-metal dichalcogenides (TMDs) materials have attracted much attention for hydrogen evolution reaction (HER) as a new catalyst, but they still have challenges in poor stability and high reaction over-potential. In this study, ultra-thin SnS2 nanocatalysts were synthesized by simple hydrothermal method, and low load of Pt was added to form stable SnS2-Pt-3 (the content of platinum is 0.5 wt %). The synergistic effect between ultra-thin SnS2 rich in active sites and individual dispersed Pt nanoclusters can significantly reduce the reaction barrier and further accelerate HER reaction kinetics. Hence, SnS2-Pt-3 exhibits a low overpotential of 210 mV at the current density of 10 mA cm−2. It is worth noting that SnS2-Pt-3 has a small Tafel slope (126 mV dec−1) in 0.5 M H2SO4, as well as stability. This work provides a new option for the application of TMDs materials in efficient hydrogen evolution reaction. Moreover, this method can be easily extended to other catalysts with desired two-dimensional materials. Full article
(This article belongs to the Special Issue Two Dimensional Nanomaterials: Energy Conversion and Storage)
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15 pages, 3206 KiB  
Article
The Magnetic Proximity Effect Induced Large Valley Splitting in 2D InSe/FeI2 Heterostructures
by Yifeng Lin, Changcheng Zhang, Lixiu Guan, Zhipeng Sun and Junguang Tao
Nanomaterials 2020, 10(9), 1642; https://doi.org/10.3390/nano10091642 - 21 Aug 2020
Cited by 9 | Viewed by 3372
Abstract
The manipulation of valley splitting has potential applications in valleytronics, which lacks in pristine two-dimensional (2D) InSe. Here, we demonstrate that valley physics in InSe can be activated via the magnetic proximity effect exerted by ferromagnetic FeI2 substrate with spin-orbit coupling. The [...] Read more.
The manipulation of valley splitting has potential applications in valleytronics, which lacks in pristine two-dimensional (2D) InSe. Here, we demonstrate that valley physics in InSe can be activated via the magnetic proximity effect exerted by ferromagnetic FeI2 substrate with spin-orbit coupling. The valley splitting energy can reach 48 meV, corresponding to a magnetic exchange field of ~800 T. The system also presents magnetic anisotropy behavior with its easy magnetization axis tunable from in-plane to out-of-plane by the stacking configurations and biaxial tensile strain. The d-orbital-resolved magnetic anisotropic energy contributions indicate that the tensile strain effect arises from the increase of hybridization between minority Fe dxy and dx2−y2 states. Our results reveal that the magnetic proximity effect is an effective approach to stimulate the valley properties in InSe to extend its spintronic applications, which is expected to be feasible in other group-III monochalcogenides. Full article
(This article belongs to the Special Issue Two Dimensional Nanomaterials: Energy Conversion and Storage)
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Review

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25 pages, 61242 KiB  
Review
Graphene Transfer: A Physical Perspective
by Xavier Langston and Keith E. Whitener, Jr.
Nanomaterials 2021, 11(11), 2837; https://doi.org/10.3390/nano11112837 - 25 Oct 2021
Cited by 11 | Viewed by 6357
Abstract
Graphene, synthesized either epitaxially on silicon carbide or via chemical vapor deposition (CVD) on a transition metal, is gathering an increasing amount of interest from industrial and commercial ventures due to its remarkable electronic, mechanical, and thermal properties, as well as the ease [...] Read more.
Graphene, synthesized either epitaxially on silicon carbide or via chemical vapor deposition (CVD) on a transition metal, is gathering an increasing amount of interest from industrial and commercial ventures due to its remarkable electronic, mechanical, and thermal properties, as well as the ease with which it can be incorporated into devices. To exploit these superlative properties, it is generally necessary to transfer graphene from its conductive growth substrate to a more appropriate target substrate. In this review, we analyze the literature describing graphene transfer methods developed over the last decade. We present a simple physical model of the adhesion of graphene to its substrate, and we use this model to organize the various graphene transfer techniques by how they tackle the problem of modulating the adhesion energy between graphene and its substrate. We consider the challenges inherent in both delamination of graphene from its original substrate as well as relamination of graphene onto its target substrate, and we show how our simple model can rationalize various transfer strategies to mitigate these challenges and overcome the introduction of impurities and defects into the graphene. Our analysis of graphene transfer strategies concludes with a suggestion of possible future directions for the field. Full article
(This article belongs to the Special Issue Two Dimensional Nanomaterials: Energy Conversion and Storage)
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21 pages, 4375 KiB  
Review
Recent Advances in Electrical Doping of 2D Semiconductor Materials: Methods, Analyses, and Applications
by Hocheon Yoo, Keun Heo, Md. Hasan Raza Ansari and Seongjae Cho
Nanomaterials 2021, 11(4), 832; https://doi.org/10.3390/nano11040832 - 24 Mar 2021
Cited by 58 | Viewed by 9781
Abstract
Two-dimensional materials have garnered interest from the perspectives of physics, materials, and applied electronics owing to their outstanding physical and chemical properties. Advances in exfoliation and synthesis technologies have enabled preparation and electrical characterization of various atomically thin films of semiconductor transition metal [...] Read more.
Two-dimensional materials have garnered interest from the perspectives of physics, materials, and applied electronics owing to their outstanding physical and chemical properties. Advances in exfoliation and synthesis technologies have enabled preparation and electrical characterization of various atomically thin films of semiconductor transition metal dichalcogenides (TMDs). Their two-dimensional structures and electromagnetic spectra coupled to bandgaps in the visible region indicate their suitability for digital electronics and optoelectronics. To further expand the potential applications of these two-dimensional semiconductor materials, technologies capable of precisely controlling the electrical properties of the material are essential. Doping has been traditionally used to effectively change the electrical and electronic properties of materials through relatively simple processes. To change the electrical properties, substances that can donate or remove electrons are added. Doping of atomically thin two-dimensional semiconductor materials is similar to that used for silicon but has a slightly different mechanism. Three main methods with different characteristics and slightly different principles are generally used. This review presents an overview of various advanced doping techniques based on the substitutional, chemical, and charge transfer molecular doping strategies of graphene and TMDs, which are the representative 2D semiconductor materials. Full article
(This article belongs to the Special Issue Two Dimensional Nanomaterials: Energy Conversion and Storage)
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