The Application of Microwave-Assisted Technology in Nanomaterials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanofabrication and Nanomanufacturing".

Deadline for manuscript submissions: closed (26 June 2023) | Viewed by 10986

Special Issue Editor

Special Issue Information

Dear Colleagues,

The present Special Issue is a continuation of a previous successful Special Issue entitled “Microwave Technology and Nanomaterials: Synthesis and Application”. Our aim is to attract and report a rich variety of recent research findings on the overlapping areas of microwaves and nanomaterials.

The development and use of nanomaterials is one of the most active research areas. This class of materials has demonstrated a wide variety of applications ranging from biomedicine to sensors or energy. Nanomaterial preparation procedures are generally based on conventional heating methods with long synthetic times and reagent consumption. In addition, conventional synthesis methods sometimes lead to the formation of heterogeneous materials. By contrast, the use of microwaves as an energy source appears as a strategy that allows some or all of these inconveniences to be overcome. Further, nanomaterials are becoming an interesting tool for the development of materials able to control microwave radiation.

This Special Issue is open to any nanomaterial prepared using microwave in any synthetic steps. Materials can be 2D nanomaterials, nanoparticles, etc. Reports of applications of nanomaterials prepared following microwave assisted are welcome. Additionally, the preparation of devices containing nanomaterials designed to interact with microwaves is aligned with the topic.

Dr. Jose Vicente Ros Lis
Guest Editor

Manuscript Submission Information

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Keywords

  • microwave
  • nanomaterial
  • fast synthesis
  • solvothermal synthesis
  • graphene
  • metallic nanoparticles

Published Papers (5 papers)

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Research

11 pages, 7636 KiB  
Article
Design of LTE/Sub-6 GHz Dual-Band Transparent Antenna Using Frame-Structured Metal Mesh Conductive Film
by Yu-Ming Lin, Hung-Wei Wu and Shoou-Jinn Chang
Nanomaterials 2023, 13(2), 221; https://doi.org/10.3390/nano13020221 - 4 Jan 2023
Cited by 2 | Viewed by 1570
Abstract
This paper proposes a dual-band transparent antenna using frame-structured metal mesh conductive film (MMCF). The frame-structured metal mesh conductive film is based on the conductive-coated thin film and forms a narrow strip surrounding the edge of the antenna. The frame-structured metal mesh conductive [...] Read more.
This paper proposes a dual-band transparent antenna using frame-structured metal mesh conductive film (MMCF). The frame-structured metal mesh conductive film is based on the conductive-coated thin film and forms a narrow strip surrounding the edge of the antenna. The frame-structured metal mesh conductive film can resist considerable current leakage on the edge of the conductive strip to improve the antenna’s efficiency by 51% at 2.1 GHz and 53% at 3.6 GHz. As a result, the transparent dual-band antenna has an operating bandwidth of 1.9–2.4 GHz and 3.2–4.1 GHz with a high transparency of 80%, which make it valuable to the applications of biomedical electronic components, wearable devices, and automobile vehicles. Full article
(This article belongs to the Special Issue The Application of Microwave-Assisted Technology in Nanomaterials)
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11 pages, 3395 KiB  
Article
Scanning Deposition Method for Large-Area Diamond Film Synthesis Using Multiple Microwave Plasma Sources
by Seung Pyo Hong, Kang-il Lee, Hyun Jong You, Soo Ouk Jang and Young Sup Choi
Nanomaterials 2022, 12(12), 1959; https://doi.org/10.3390/nano12121959 - 8 Jun 2022
Cited by 2 | Viewed by 2054
Abstract
The demand for synthetic diamonds and research on their use in next-generation semiconductor devices have recently increased. Microwave plasma chemical vapor deposition (MPCVD) is considered one of the most promising techniques for the mass production of large-sized and high-quality single-, micro- and nanocrystalline [...] Read more.
The demand for synthetic diamonds and research on their use in next-generation semiconductor devices have recently increased. Microwave plasma chemical vapor deposition (MPCVD) is considered one of the most promising techniques for the mass production of large-sized and high-quality single-, micro- and nanocrystalline diamond films. Although the low-pressure resonant cavity MPCVD method can synthesize high-quality diamonds, improvements are needed in terms of the resulting area. In this study, a large-area diamond synthesis method was developed by arranging several point plasma sources capable of processing a small area and scanning a wafer. A unit combination of three plasma sources afforded a diamond film thickness uniformity of ±6.25% at a wafer width of 70 mm with a power of 700 W for each plasma source. Even distribution of the diamond grains in a size range of 0.1–1 μm on the thin-film surface was verified using field-emission scanning electron microscopy. Therefore, the proposed novel diamond synthesis method can be theoretically expanded to achieve large-area films. Full article
(This article belongs to the Special Issue The Application of Microwave-Assisted Technology in Nanomaterials)
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10 pages, 4443 KiB  
Article
A New Strategy to Fabricate Nanoporous Gold and Its Application in Photodetector
by Shunlin Yu, Chuan Liu and Songjia Han
Nanomaterials 2022, 12(9), 1580; https://doi.org/10.3390/nano12091580 - 6 May 2022
Cited by 1 | Viewed by 1802
Abstract
Nanoporous gold (NPG) plays an important role in high-performance electronic devices, including sensors, electrocatalysis, and energy storage systems. However, the traditional fabricating methods of NPG, dealloying technique or electrochemical reduction technique, usually require complex experimental procedures and sophisticated equipment. In this work, we [...] Read more.
Nanoporous gold (NPG) plays an important role in high-performance electronic devices, including sensors, electrocatalysis, and energy storage systems. However, the traditional fabricating methods of NPG, dealloying technique or electrochemical reduction technique, usually require complex experimental procedures and sophisticated equipment. In this work, we reported a unique and simple method to prepare the NPG through a low-temperature solution process. More importantly, the structure of the NPG-based electrode can be further controlled by using the post-treatment process, such as thermal treatment and plasma treatment. Additionally, we also demonstrate the application of the resulting NPG electrodes in flexible photodetectors, which performs a higher sensitivity than common planar photodetectors. We believe that our work opens a possibility for the nanoporous metal in future electronics that is flexible, large scale, with facile fabrication, and low cost. Full article
(This article belongs to the Special Issue The Application of Microwave-Assisted Technology in Nanomaterials)
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15 pages, 7537 KiB  
Article
Implementation of Ambipolar Polysilicon Thin-Film Transistors with Nickel Silicide Schottky Junctions by Low-Thermal-Budget Microwave Annealing
by Jin-Gi Min, Dong-Hee Lee, Yeong-Ung Kim and Won-Ju Cho
Nanomaterials 2022, 12(4), 628; https://doi.org/10.3390/nano12040628 - 13 Feb 2022
Cited by 4 | Viewed by 2506
Abstract
In this study, the efficient fabrication of nickel silicide (NiSix) Schottky barrier thin-film transistors (SB-TFTs) via microwave annealing (MWA) technology is proposed, and complementary metal-oxide-semiconductor (CMOS) inverters are implemented in a simplified process using ambipolar transistor properties. To validate the efficacy [...] Read more.
In this study, the efficient fabrication of nickel silicide (NiSix) Schottky barrier thin-film transistors (SB-TFTs) via microwave annealing (MWA) technology is proposed, and complementary metal-oxide-semiconductor (CMOS) inverters are implemented in a simplified process using ambipolar transistor properties. To validate the efficacy of the NiSix formation process by MWA, NiSix is also prepared via the conventional rapid thermal annealing (RTA) process. The Rs of the MWA NiSix decreases with increasing microwave power, and becomes saturated at 600 W, thus showing lower resistance than the 500 °C RTA NiSix. Further, SB-diodes formed on n-type and p-type bulk silicon are found to have optimal rectification characteristics at 600 W microwave power, and exhibit superior characteristics to the RTA SB-diodes. Evaluation of the electrical properties of NiSix SB-TFTs on excimer-laser-annealed (ELA) poly-Si substrates indicates that the MWA NiSix junction exhibits better ambipolar operation and transistor performance, along with improved stability. Furthermore, CMOS inverters, constructed using the ambipolar SB-TFTs, exhibit better voltage transfer characteristics, voltage gains, and dynamic inverting behavior by incorporating the MWA NiSix source-and-drain (S/D) junctions. Therefore, MWA is an effective process for silicide formation, and ambipolar SB-TFTs using MWA NiSix junctions provide a promising future for CMOS technology. Full article
(This article belongs to the Special Issue The Application of Microwave-Assisted Technology in Nanomaterials)
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15 pages, 58907 KiB  
Article
Microwave-Assisted Vacuum Synthesis of TiO2 Nanocrystalline Powders in One-Pot, One-Step Procedure
by Enrico Paradisi, Roberto Rosa, Giovanni Baldi, Valentina Dami, Andrea Cioni, Giada Lorenzi and Cristina Leonelli
Nanomaterials 2022, 12(1), 149; https://doi.org/10.3390/nano12010149 - 31 Dec 2021
Cited by 3 | Viewed by 1895
Abstract
A new method for fast and simple synthesis of crystalline TiO2 nanoparticles with photocatalytic activity was developed by carrying out a classic sol–gel reaction directly under vacuum. The use of microwaves for fast heating of the reaction medium further reduces synthesis times. [...] Read more.
A new method for fast and simple synthesis of crystalline TiO2 nanoparticles with photocatalytic activity was developed by carrying out a classic sol–gel reaction directly under vacuum. The use of microwaves for fast heating of the reaction medium further reduces synthesis times. When the solvent is completely removed by vacuum, the product is obtained in the form of a powder that can be easily redispersed in water to yield a stable nanoparticle suspension, exhibiting a comparable photocatalytic activity with respect to a commercial product. The present methodology can, therefore, be considered a process intensification procedure for the production of nanotitania. Full article
(This article belongs to the Special Issue The Application of Microwave-Assisted Technology in Nanomaterials)
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