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Materials
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Anisotropic Functional Nanomaterials: Preparations, Characterizations, and Applications
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Anisotropic Functional Nanomaterials: Preparations, Characterizations, and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: 31 July 2024 | Viewed by 5962

Special Issue Editor

Dr. Takashi Ikuno

E-Mail Website
Guest Editor
Department of Applied Electronics, Faculty of Advanced Engineering, Tokyo University of Science, Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
Interests: low-dimensional nanomaterials; thin films; energy conversion devices; surface and interface

Special Issue Information

Dear Colleagues,

Anisotropic one- and two-dimensional nanoscale building blocks have fascinating and elegant physical and chemical properties that are dependent on their morphology and dimensions. In addition to the unique properties of anisotropic nanomaterials themselves, new functionalities can be actualized by surface modification and composites of anisotropic nanomaterials. In fact, it is expected that various types of anisotropic nanomaterials will be utilized in modern engineering practice in the near future; for example, different types of nanostructured thin films, fibrous composites, laminates, and multifunctional composites including anisotropic nanomaterials such as carbon nanotubes, semiconductor nanofibers, graphene, atomic-layer crystals of Si and Ge, layered-transition metal dichalcogenides, single-layer crystals of organic semiconductors, biomolecules, and microscopic organisms in semiconductor, battery, aerospace, car industry, or civil engineering applications.

This Special Issue (SI) will compile recent progress in research and development in the field of anisotropic nanomaterials with useful properties, which concerns not only nanotubes, nanowires, nanosheets, and thin films but also surfaces and interfaces. The articles presented in this SI will cover various topics, ranging from but not limited to the optimization of fabrication methods of anisotropic nanomaterials, composite preparations, the functionalization of surfaces, sensors, catalysis, electronic devices, solar cells, energy conversion devices, energy storage devices, and actuators, among others.

Dr. Takashi Ikuno
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. Materials 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 2600 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

  • nanocarbon materials
  • semiconductor nanowires
  • transition metal dichalcogenides
  • IV-atomic nanosheets
  • nanoribbons
  • surface modifications
  • surface and interfaces
  • heterojunctions
  • functional composites
  • confined nanostructures
  • energy conversion/storage devices
  • sensors/actuators
  • semiconductor devices

Published Papers (3 papers)

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Research

6 pages, 1804 KiB  
Article
Dispersion of Long and Isolated Single-Wall Carbon Nanotubes by Using a Hydrodynamic Cavitation Method
by Shunjiro Fujii, Shin-ichi Honda, Yoshihiro Oka, Yuki Kuwahara and Takeshi Saito
Materials 2023, 16(2), 466; https://doi.org/10.3390/ma16020466 - 4 Jan 2023
Viewed by 1829
Abstract
Single-wall carbon nanotubes (SWCNTs) are promising materials for electronic applications, such as transparent electrodes and thin-film transistors. However, the dispersion of isolated SWCNTs into solvents remains an important issue for their practical applications. SWCNTs are commonly dispersed in solvents via ultrasonication. However, ultrasonication [...] Read more.
Single-wall carbon nanotubes (SWCNTs) are promising materials for electronic applications, such as transparent electrodes and thin-film transistors. However, the dispersion of isolated SWCNTs into solvents remains an important issue for their practical applications. SWCNTs are commonly dispersed in solvents via ultrasonication. However, ultrasonication damages SWCNTs, forming defects and cutting them into short pieces, which significantly degrade their electrical and mechanical properties. Herein, we demonstrate a novel approach toward the large-scale dispersion of long and isolated SWCNTs by using hydrodynamic cavitation. Considering the results of atomic force microscopy and dynamic light-scattering measurements, the average length of the SWCNTs dispersed via the hydrodynamic cavitation method is larger than that of the SWCNTs dispersed by using an ultrasonic homogenizer. Full article
(This article belongs to the Special Issue Anisotropic Functional Nanomaterials: Preparations, Characterizations, and Applications)
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7 pages, 1993 KiB  
Article
Light-Driven Flying Balloons Based on Hybrids of Carbon Nanotubes and Cellulose Nanofibers
by Takashi Ikuno, Kazuki Takahashi and Akari Kadogawa
Materials 2022, 15(21), 7739; https://doi.org/10.3390/ma15217739 - 3 Nov 2022
Cited by 1 | Viewed by 993
Abstract
We have fabricated nanocarbon-based palm-sized cubic paper balloons that can be levitated by light irradiation. These paper balloons are composed of carbon nanotube (CNT) freestanding films and cellulose nanofiber (CNF) freestanding films. The number of CNT freestanding films (NCNT) and [...] Read more.
We have fabricated nanocarbon-based palm-sized cubic paper balloons that can be levitated by light irradiation. These paper balloons are composed of carbon nanotube (CNT) freestanding films and cellulose nanofiber (CNF) freestanding films. The number of CNT freestanding films (NCNT) and the number of CNF freestanding films (6-NCNT) among the six walls of the cube were varied. We investigated the effect of NCNT on the levitation behaviors under light irradiation. We found that the balloons were levitated when NCNT was greater than or equal to two. The levitation height was found to be increased by increasing NCNT. Full article
(This article belongs to the Special Issue Anisotropic Functional Nanomaterials: Preparations, Characterizations, and Applications)
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14 pages, 4224 KiB  
Article
Selective Etching of Si versus Si1−xGex in Tetramethyl Ammonium Hydroxide Solutions with Surfactant
by Yongjoon Choi, Choonghee Cho, Dongmin Yoon, Joosung Kang, Jihye Kim, So Young Kim, Dong Chan Suh and Dae-Hong Ko
Materials 2022, 15(19), 6918; https://doi.org/10.3390/ma15196918 - 5 Oct 2022
Viewed by 2056
Abstract
We investigated the selective etching of Si versus Si1−xGex with various Ge concentrations (x = 0.13, 0.21, 0.30, 0.44) in tetramethyl ammonium hydroxide (TMAH) solution. Our results show that the Si1−xGex with a higher Ge concentration was [...] Read more.
We investigated the selective etching of Si versus Si1−xGex with various Ge concentrations (x = 0.13, 0.21, 0.30, 0.44) in tetramethyl ammonium hydroxide (TMAH) solution. Our results show that the Si1−xGex with a higher Ge concentration was etched slower due to the reduction in the Si(Ge)–OH bond. Owing to the difference in the etching rate, Si was selectively etched in the Si0.7Ge0.3/Si/Si0.7Ge0.3 multi-layer. The etching rate of Si depends on the Si surface orientation, as TMAH is an anisotropic etchant. The (111) and (010) facets were formed in TMAH, when Si was laterally etched in the <110> and <100> directions in the multi-layer, respectively. We also investigated the effect of the addition of Triton X-100 in TMAH on the wet etching process. Our results confirmed that the presence of 0.1 vol% Triton reduced the roughness of the etched Si and Si1−xGex surfaces. Moreover, the addition of Triton to TMAH could change the facet formation from (010) to (011) during Si etching in the <100>-direction. The facet change could reduce the lateral etching rate of Si and consequently reduce selectivity. The decrease in the layer thickness also reduced the lateral Si etching rate in the multi-layer. Full article
(This article belongs to the Special Issue Anisotropic Functional Nanomaterials: Preparations, Characterizations, and Applications)
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