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Nanomaterials
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State-of-the-Art Electromagnetic Wave Absorbing Nanocomposites in Asia
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State-of-the-Art Electromagnetic Wave Absorbing Nanocomposites in Asia

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 4971

Special Issue Editors

Prof. Dr. Hongjing Wu

E-Mail Website
Guest Editor
School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an, China
Interests: electromagnetic wave absorbing ferrite materials; synthesis of multi-shelled hollow oxide/ferrite spheres; environmental catalysis
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Xiaomeng Fan

E-Mail Website
Guest Editor
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, China
Interests: ceramics; electromagnetic wave absorbing/shielding materials; carbon materials

Special Issue Information

Dear Colleagues,

Today, electromagnetic pollution triggered by the wide application of 5G technology poses a grave threat to people's health and the use of precision instruments. The most effective way to solve this issue is to design effective electromagnetic wave absorbing materials (EMWAMs). In order to achieve significant absorption of electromagnetic waves, the absorber should include exceptional impedance matching ability and excellent attenuation ability. Due to quantum size effect and small size effect, nanomaterials have been widely used in the field of microwave absorption. However, with single-phase nanomaterials, it is generally difficult to achieve plummy impedance matching or attenuation performance. Rational recombination of nanomaterials is an effective avenue by which to achieve dissipative electromagnetic waves. For example, single-phase MXene is widely used in the field of electromagnetic shielding due to its high conductivity, and MXene-based composite may be one of the optimum candidates for the purpose of “thin, light, wide and strong” EMW absorbing materials.

In recent years, researchers from Asia have been very active in the field of EMWAMs, contributing the most papers. This Special Issue specifically focuses on “electromagnetic wave absorbing nanocomposites”, including ferrites, oxides, carbides, sulfides, MXenes, ceramics, and carbon materials, and welcomes contributions devoted to nanocomposite synthesis, advanced characterization, and the relationship between structure and properties of novel electromagnetic wave absorbing nanocomposites.

Prof. Dr. Hongjing Wu
Prof. Dr. Xiaomeng Fan
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

  • electromagnetic wave absorption
  • nanocomposites
  • synthesis
  • characterization
  • mechanism

Published Papers (3 papers)

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16 pages, 32169 KiB  
Article
Defect- and Interface-Induced Dielectric Loss in ZnFe2O4/ZnO/C Electromagnetic Wave Absorber
by Hao Shen, Zhen Wang, Chun Wang, Pengfei Zou, Zhaoyang Hou, Chunlong Xu and Hongjing Wu
Nanomaterials 2022, 12(16), 2871; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12162871 - 20 Aug 2022
Cited by 8 | Viewed by 1500
Abstract
Controlling defects and interfaces in composite absorbers can effectively regulate electromagnetic (EM) parameters and enhance the electromagnetic wave (EMW) absorption ability, but the mechanism still needs to be further elucidated. In this study, ZnFe2O4/ZnO/C composite was synthesized via the [...] Read more.
Controlling defects and interfaces in composite absorbers can effectively regulate electromagnetic (EM) parameters and enhance the electromagnetic wave (EMW) absorption ability, but the mechanism still needs to be further elucidated. In this study, ZnFe2O4/ZnO/C composite was synthesized via the hydrothermal method followed by post-annealing in different atmospheres. Defects and interfaces were characterized by Raman, PL spectroscopy, XPS and TEM, and their relationship with dielectric loss and EMW absorption performance was discussed in detail. Results show that the N2-annealed ZnFe2O4/ZnO/C composite with abundant defects and interfaces as well as an optimized composition exhibits excellent EMW dissipation ability, with a RLmin value of −17.4 dB and an fe of 3.85 GHz at a thickness of 2.28 mm. The excellent EMW absorption performance originates from suitable impedance matching, significant conduction loss and strong dielectric loss (interfacial polarization, diploe polarization and defect polarization) dominated by lattice defects and interfaces. This study provides a view into the relationship between defects, interfaces, EM parameters and EMW absorption ability, and also suggests an effective way to promote EMW dissipation ability of the absorbers by controlling defects and interfaces. Full article
(This article belongs to the Special Issue State-of-the-Art Electromagnetic Wave Absorbing Nanocomposites in Asia)
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12 pages, 4354 KiB  
Article
Tuning the Dielectric and Microwaves Absorption Properties of N-Doped Carbon Nanotubes by Boron Insertion
by Qingya Sun, Xinfang Zhang, Ruonan Liu, Shaofeng Shen, Fan Wu and Aming Xie
Nanomaterials 2021, 11(5), 1164; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11051164 - 29 Apr 2021
Cited by 14 | Viewed by 1831
Abstract
It is of great significance to regulate the dielectric parameters and microstructure of carbon materials by elemental doping in pursuing microwave absorption (MA) materials of high performance. In this work, the surface electronic structure of N-doped CNTs was tuned by boron doping, in [...] Read more.
It is of great significance to regulate the dielectric parameters and microstructure of carbon materials by elemental doping in pursuing microwave absorption (MA) materials of high performance. In this work, the surface electronic structure of N-doped CNTs was tuned by boron doping, in which the MA performance of CNTs was improved under the synergistic action of B and N atoms. The B,N-doped carbon nanotubes (B,N-CNTs) exhibited excellent MA performance, where the value of minimum reflection loss was −40.04 dB, and the efficient absorption bandwidth reached 4.9 GHz (10.5–15.4 GHz). Appropriate conductance loss and multi-polarization loss provide the main contribution to the MA of B,N-CNTs. This study provides a novel method for the design of CNTs related MA materials. Full article
(This article belongs to the Special Issue State-of-the-Art Electromagnetic Wave Absorbing Nanocomposites in Asia)
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9 pages, 3393 KiB  
Article
Nonlinear Optical Response of Reflective MXene Molybdenum Carbide Films as Saturable Absorbers
by Jiang Wang, Yonggang Wang, Sicong Liu, Guangying Li, Guodong Zhang and Guanghua Cheng
Nanomaterials 2020, 10(12), 2391; https://0-doi-org.brum.beds.ac.uk/10.3390/nano10122391 - 30 Nov 2020
Cited by 10 | Viewed by 2099
Abstract
Molybdenum carbide (Mo2C) is a two-dimensional (2D) MXene material which makes it a promising photoelectric material. In this study, reflective type MXene Mo2C thin films were coated on a silver mirror by a magnetron sputtering method and were subsequently [...] Read more.
Molybdenum carbide (Mo2C) is a two-dimensional (2D) MXene material which makes it a promising photoelectric material. In this study, reflective type MXene Mo2C thin films were coated on a silver mirror by a magnetron sputtering method and were subsequently used in a passively Q-switched solid-state pulsed laser generator at the central wavelengths of 1.06 and 1.34 μm, respectively. The fabricated thin films of reflective type MXene Mo2C exhibited large modulation depth of 6.86% and 5.38% at the central wavelengths of 1064 and 1342 nm, respectively. By inserting the Mo2C saturable absorbers (SAs) into V-shaped Nd:YAG laser, short pulses were generated having a pulse duration, pulse energy, and average output power of 254 ns, 2.96 μJ, and 275 mW, respectively, at a wavelength of 1.06 μm. Similarly, shorter laser pulses were obtained in Nd:YVO4 laser at 1.34 μm. Our results illustrated potential of the 2D MXene Mo2C films for laser applications. Full article
(This article belongs to the Special Issue State-of-the-Art Electromagnetic Wave Absorbing Nanocomposites in Asia)
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