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State-of-the-Art 2D and Carbon Nanomaterials in Japan

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

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 11439

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Special Issue Editor

Prof. Dr. Hiroshi Furuta

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Guest Editor

School of Systems Engineering, Kochi University of Technology, Kochi, Japan
Interests: carbon nanotubes; graphene; low-dimensional materials; metamaterials; energy storage and conversion materials; neuromorphic materials; thin film technology; field emission
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will aims to publish original research and review articles related to 2D and Carbon Nanomaterials in Japan. Research topics include, but are not limited to, the following:

Fabrication and characterization techniques, and applications of 2D and carbon nanomaterials;
Structural, electonic, magnetic, and optical properties of 2D and carbon nanomaterials;

This Special Issue will portray the state of 2D and carbon nanomaterials in Japan and will more clearly present our country's achievements in this field, with the hope to promoting collaborations between Japan and international researchers in the world.

Prof. Dr. Hiroshi Furuta
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

carbon nanotubes
graphene
carbon materials
layered III–VI metal chalcogenides
Mxene
transition metal dichalcogenide
2D semiconductor
2D heterojunction
2D perovskite
2D MOFs
2D COFs

Published Papers (5 papers)

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Research

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10 pages, 3766 KiB

Open AccessEditor’s ChoiceArticle

Hot Electron Extraction in SWCNT/TiO₂ for Photocatalytic H₂ Evolution from Water

by Masahiro Yamagami, Tomoyuki Tajima, Zihao Zhang, Jun Kano, Ki-ichi Yashima, Takana Matsubayashi, Huyen Khanh Nguyen, Naoto Nishiyama, Tomoya Hayashi and Yutaka Takaguchi

Nanomaterials 2022, 12(21), 3826; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12213826 - 29 Oct 2022

Viewed by 1857

Abstract

Single-walled carbon nanotube (SWCNT)/TiO₂ hybrids were synthesized using 1,10-bis(decyloxy)decane-core PAMAM dendrimer as a molecular glue. Upon photoirradiation of a water dispersion of SWCNT/TiO₂ hybrids with visible light (λ > 422 nm), the hydrogen evolution reaction proceeded at a rate of 0.95 mmol/h·g in the presence of a sacrificial agent (1-benzyl-1,4-dihydronicotinamide, BNAH). External quantum yields (EQYs) of the hydrogen production reaction photosensitized by (6,5), (7,5), and (8,3) tubes were estimated to be 5.5%, 3.6%, and 2.2%, respectively, using monochromatic lights corresponding to their E₂₂ absorptions (570 nm, 650 nm, and 680 nm). This order of EQYs (i.e., (6,5) > (7,5) > (8,3)SWCNTs) exhibited the dependence on the C₂ energy level of SWCNT for EQY and proved the hot electron extraction pathway. Full article

(This article belongs to the Special Issue State-of-the-Art 2D and Carbon Nanomaterials in Japan)

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10 pages, 2455 KiB

Open AccessArticle

Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications

by Hiroaki Komatsu, Yurika Kawamoto and Takashi Ikuno

Nanomaterials 2022, 12(6), 940; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12060940 - 12 Mar 2022

Cited by 7 | Viewed by 3248

Abstract

The rapidly advancing technology of wearable and miniaturized electronics has increased the demand for low-cost high-performance flexible sensors. Herein, the preparation of translucent freestanding films consisting of cellulose nanofibers (CNFs) and ZnO nanoparticles (NPs) via a simple spray coating method is presented. The obtained nanocomposite films were thin (~10 µm) and flexible. The scanning electron microscopy and atomic force microscopy analysis revealed that the nanocomposite film was composed of regions of ZnO NP-modified CNFs and regions of aggregation of ZnO NPs with each other. The electrical conductance of the films was rapidly increased beyond 40 wt.% ZnO and reached up to >50 nA at 60 wt.% ZnO. This was attributed to the increased number of conductive paths formed by the ZnO NPs in the nanocomposite film when a certain threshold was crossed. The ZnO–CNF nanocomposite film exhibited a stable response over on/off cycles of UV light exposure. The responsivity and sensitivity of the nanocomposite film with 60 wt.% ZnO were 36.5 mA/W and 247, respectively. Even when the device was curved (radius of curvature: 3 mm), the response and sensitivity remained high. The developed nanocomposite films are expected to be applied as environmentally friendly flexible UV sensors. Full article

(This article belongs to the Special Issue State-of-the-Art 2D and Carbon Nanomaterials in Japan)

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13 pages, 5469 KiB

Open AccessArticle

Fabrication of Self-Assembling Carbon Nanotube Forest Fishnet Metamaterials

by Adam Pander, Takatsugu Onishi, Akimitsu Hatta and Hiroshi Furuta

Nanomaterials 2022, 12(3), 464; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12030464 - 28 Jan 2022

Cited by 3 | Viewed by 2656

Abstract

The investigation of the preparation of polystyrene (PS) nanosphere monolayers for the fabrication of carbon nanotube (CNT) forest fishnet metamaterial structures is studied in this paper, as a cheap alternative for top-down patterning methods. The precise control of dry etching conditions resulted in a highly controlled diameter of PS nanobeads, which were then used as a shadow mask for CNT fishnet preparation. The change of the size of the holes from 370 nm to 665 nm resulted in a gradual change of the CNT morphology from multi-walled to single-walled CNTs. The ultraviolet-visible (UV-Vis) reflectance spectra showed that the variation of the hole diameter resulted in the nonlinear light absorption in CNT fishnets that caused the change of the resonance frequency. The change of the fishnet wire width (inductance) and the hole size (capacitance) resulted in the blueshift of the broadband resonance frequency peak. The presented work has a significant potential to allow for the large-scale fabrication of CNT-based fishnet metamaterial structures for applications in energy harvesting, energy storage, solar cells, or optoelectronic devices, such as neuromorphic networks. Full article

(This article belongs to the Special Issue State-of-the-Art 2D and Carbon Nanomaterials in Japan)

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11 pages, 2875 KiB

Open AccessFeature PaperArticle

Formation of Thermally Stable, High-Areal-Density, and Small-Diameter Catalyst Nanoparticles via Intermittent Sputtering Deposition for the High-Density Growth of Carbon Nanotubes

by Hirofumi Koji, Yuji Kusumoto, Akimitsu Hatta and Hiroshi Furuta

Nanomaterials 2022, 12(3), 365; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12030365 - 24 Jan 2022

Cited by 1 | Viewed by 2445

Abstract

We report the formation of thermally stable catalyst nanoparticles via intermittent sputtering deposition to prevent the agglomeration of the nanoparticles during thermal chemical vapor deposition (CVD) and for the high-density growth of carbon nanotubes (CNTs). The preparation of high-areal-density and small-diameter catalyst nanoparticles on substrates for the high-density growth of CNTs is still a challenging issue because surface diffusion and Ostwald ripening of the nanoparticles induce agglomeration, which results in the low-density growth of large-diameter CNTs during high-temperature thermal CVD. Enhancing the adhesion of nanoparticles or suppressing their diffusion on the substrate to retain a small particle diameter is desirable for the preparation of thermally stable, high-areal-density, and small-diameter catalyst nanoparticles. The intermittent sputtering method was employed to deposit Ni and Fe metal nanoparticles on a substrate for the synthesis of high-areal-density CNTs for Fe nanoparticle catalyst films. The metal particles deposited via intermittent sputtering with an interval time of over 30 s maintained their areal densities and diameters during the thermal CVD process in a vacuum for CNT synthesis. An interval of over 30 s was expected to oxidize the metal particles, which resulted in thermal stability during the CVD process. The intermittent sputtering method is thus a candidate process for the preparation of thermally stable catalyst films for the growth of a high density of long CNTs, which can be combined with the present CNT production process. Full article

(This article belongs to the Special Issue State-of-the-Art 2D and Carbon Nanomaterials in Japan)

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Review

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22 pages, 4019 KiB

Open AccessEditor’s ChoiceReview

Recent Development of Carbon-Nanotube-Based Solar Heat Absorption Devices and Their Application

by Saiful Islam and Hiroshi Furuta

Nanomaterials 2022, 12(21), 3871; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12213871 - 02 Nov 2022

Cited by 3 | Viewed by 2917

Abstract

Population growth and the current global weather patterns have heightened the need to optimize solar energy harvesting. Solar-powered water filtration, electricity generation, and water heating have gradually multiplied as viable sources of fresh water and power generation, especially for isolated places without access to water and energy. The unique thermal and optical characteristics of carbon nanotubes (CNTs) enable their use as efficient solar absorbers with enhanced overall photothermal conversion efficiency under varying solar light intensities. Due to their exceptional optical absorption efficiency, low cost, environmental friendliness, and natural carbon availability, CNTs have attracted intense scientific interest in the production of solar thermal systems. In this review study, we evaluated CNT-based water purification, thermoelectric generation, and water heating systems under varying solar levels of illumination, ranging from domestic applications to industrial usage. The use of CNT composites or multilayered structures is also reviewed in relation to solar heat absorber applications. An aerogel containing CNTs was able to ameliorate water filtering performance at low solar intensities. CNTs with a Fresnel lens improved thermoelectric output power at high solar intensity. Solar water heating devices utilizing a nanofluid composed of CNTs proved to be the most effective. In this review, we also aimed to identify the most relevant challenges and promising opportunities in relation to CNT-based solar thermal devices. Full article

(This article belongs to the Special Issue State-of-the-Art 2D and Carbon Nanomaterials in Japan)

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