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Advances in Electronic and Photonic Materials
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Advances in Electronic and Photonic Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Optical and Photonic Materials".

Deadline for manuscript submissions: 30 August 2025 | Viewed by 2830

Special Issue Editor

Dr. Hiesang Sohn

E-Mail Website
Guest Editor
Department of Chemical Engineering, Kwangwoon University, Seoul 01897, Republic of Korea
Interests: supercapacitors; iron oxide-carbon nanocomposites; organic ligands; anode materials; lithium-ion batteries electrochemical performance
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Electronic and photonic materials are at the forefront of technological advancements, driving innovation in electronic and photonic devices that have become integral to our daily lives. In the field of electronic materials, there is a growing emphasis on the development of new semiconductor materials, such as organic and two-dimensional materials, to enable the next generation of high-speed, low-power electronic devices. Additionally, the integration of novel materials into electronic circuits and the exploration of new fabrication techniques are key trends in electronic materials research. Meanwhile, there is a rising interest in materials that can manipulate light at the nanoscale, enabling the development of compact and efficient photonic devices for communication, sensing, and imaging applications.

However, some problems prevent the development, like scalability, manufacturability, and sustainability. And researchers focus on overcoming fundamental material limitations to enable the development of new functionalities and applications.

This Special Issue will provide readers with up-to-date information on the recent progress and future challenges in the fields of electronic and photonic materials. All original research article or review papers are welcomed to contribute.

Dr. Hiesang Sohn
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

  • electronic materials
  • photonic materials
  • two-dimensional materials
  • semiconductors
  • insulators
  • optical and display materials
  • materials for transistors
  • quantum spintronics
  • nanotechnology
  • metallization
  • superconductivity

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Published Papers (5 papers)

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Research

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11 pages, 27459 KiB  
Article
Deep Eutectic Solvents Based on N-Methyltrifluoroacetamide and Lithium Bis(trifluoromethanesulfonyl)imide as New Electrolytes with Low Viscosity and High Ionic Conductivity
by Guihong Lyu, Carsten Korte and Jiangshui Luo
Materials 2025, 18(9), 2048; https://doi.org/10.3390/ma18092048 - 30 Apr 2025
Abstract
In this work, we present a study on the thermal/transport properties of a novel deep eutectic solvent (DES) obtained by using N-methyltrifluoroacetamide (FNMA) as the hydrogen bond donor (HBD) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as the hydrogen bond acceptor (HBA). The binary phase diagram, [...] Read more.
In this work, we present a study on the thermal/transport properties of a novel deep eutectic solvent (DES) obtained by using N-methyltrifluoroacetamide (FNMA) as the hydrogen bond donor (HBD) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) as the hydrogen bond acceptor (HBA). The binary phase diagram, thermal stability, flammability, viscosity and ionic conductivity of the as-prepared DESs were investigated at atmospheric pressure. The binary phase diagram shows a range of eutectic molar ratios (xLiTFSI = 0.2~0.33), with the lowest deep eutectic temperature of −84 °C. At xLiTFSI = 0.2 (i.e., FNMA:LiTFSI = 4:1 and denoted as DES-4:1). The as-prepared DES composition exhibits high thermal stability (onset temperature of weight loss = 78 °C), a low viscosity (η = 48.9 mPa s at 25 °C), relatively high ionic conductivity (σ = 0.86 mS cm−1 at 25 °C) and non-flammability. The transport properties, including ionic conductivity and viscosity, as a function of temperature are in accordance with the Vogel–Fulcher–Tammann (VFT) equations. With increasing molar ratio of HBD vs. HBA, the viscosity decreases, and the ionic conductivity increases at a given temperature between 25 °C and 80 °C. The roughly equal pseudo-activation energies for ion transport and viscous flow in each composition imply a strong coupling of ion transport and viscous flow. Walden plots indicate vehicular transport as the main ion transport mechanism for the DES-4:1 and DES-3:1 compositions; meanwhile, it was confirmed that the ionic conductivity and viscous flow are strictly coupled. The present work is expected to provide strategies for the development of wide-temperature-range and safer electrolytes with low salt concentrations. Full article
(This article belongs to the Special Issue Advances in Electronic and Photonic Materials)
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10 pages, 5169 KiB  
Article
Impacts of Hydrogen Adsorption on Carbon Nanotube–Metal Schottky Contacts
by Chuntian Huang, Nini Ye, Haijun Luo, Hezhu Shao, Weijin Qian, Chaolong Fang and Changkun Dong
Materials 2025, 18(6), 1202; https://doi.org/10.3390/ma18061202 - 7 Mar 2025
Viewed by 568
Abstract
Carbon nanotube (CNT)–metal Schottky contacts are widely employed in different types of electronic devices, including field effect transistors (FET) and gas sensors. CNTs are normally considered stable on electronic properties with gas adsorptions. In this work, performance changes of the multi-walled carbon nanotube [...] Read more.
Carbon nanotube (CNT)–metal Schottky contacts are widely employed in different types of electronic devices, including field effect transistors (FET) and gas sensors. CNTs are normally considered stable on electronic properties with gas adsorptions. In this work, performance changes of the multi-walled carbon nanotube (MWCNT)–metal junctions related to hydrogen adsorptions were illustrated. MWCNT/Pd and MWCNT/Au Schottky junctions based resistive sensors were constructed to investigate the low-pressure gas sensing performances for hydrogen in the range of 10−6~10−3 Pa. Two types of sensors presented opposite behaviors with hydrogen adsorptions, i.e., the sensor resistance rose for the MWCNT/Pd sensor but dropped for the MWCNT/Au sensor with increasing hydrogen pressure. The work function reductions of Pd and CNT are considered the key cause, which could change the Schottky barrier properties dramatically. This behavior may play crucial roles for the accurate utilization of CNT-based Schottky devices. Full article
(This article belongs to the Special Issue Advances in Electronic and Photonic Materials)
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20 pages, 12087 KiB  
Article
Preliminary Broadband Dielectric Spectroscopy Insight into Compressed Orientationally Disordered Crystal-Forming Neopentyl Glycol (NPG)
by Aleksandra Drozd-Rzoska, Jakub Kalabiński and Sylwester J. Rzoska
Materials 2025, 18(3), 635; https://doi.org/10.3390/ma18030635 - 31 Jan 2025
Viewed by 554
Abstract
This report presents the first results on broadband dielectric spectroscopy insights into ODIC-forming neopentyl glycol (NPG) under compression up to the GPa domain. Particular attention was paid to the strongly discontinuous phase transition: orientationally disordered crystal (ODIC)–solid crystal. The insights cover static, dynamic, [...] Read more.
This report presents the first results on broadband dielectric spectroscopy insights into ODIC-forming neopentyl glycol (NPG) under compression up to the GPa domain. Particular attention was paid to the strongly discontinuous phase transition: orientationally disordered crystal (ODIC)–solid crystal. The insights cover static, dynamic, and energy-related properties, namely evolutions of the dielectric constant, DC electric conductivity, and dissipation factor. Worth stressing are results regarding the pressure-related Mossotti catastrophe-type behavior of the dielectric constant, the novel approach to non-Barus dynamics, and the discussion on fundamentals of dissipation factor changes in NPG. The results presented in the given report also introduce new experimental evidence and model discussions regarding the nature of ODIC mesophase and discontinuous phase transitions. Notable is the significance of understanding the nature of the colossal barocaloric effect in NPG. Full article
(This article belongs to the Special Issue Advances in Electronic and Photonic Materials)
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Review

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26 pages, 4573 KiB  
Review
Flexible Glass: Myth and Photonic Technology
by Giancarlo C. Righini, Maurizio Ferrari, Anna Lukowiak and Guglielmo Macrelli
Materials 2025, 18(9), 2010; https://doi.org/10.3390/ma18092010 - 29 Apr 2025
Viewed by 186
Abstract
The recent fast advances in consumer electronics, especially in cell phones and displays, have led to the development of ultra-thin, hence flexible, glasses. Once available, such flexible glasses have proven to be of great interest and usefulness in other fields, too. Flexible photonics, [...] Read more.
The recent fast advances in consumer electronics, especially in cell phones and displays, have led to the development of ultra-thin, hence flexible, glasses. Once available, such flexible glasses have proven to be of great interest and usefulness in other fields, too. Flexible photonics, for instance, has quickly taken advantage of this new material. At first sight, “flexible glass” appears to be an oxymoron. Glass is, by definition, fragile and highly breakable; its structure has puzzled scientists for decades, but it is evident that in most conditions it is a rigid material, so how can it bend? This possibility, however, has aroused the interest of artists and craftsmen since ancient times; thus, in Roman times the myth of flexible glass was born. Furthermore, the myth appeared again in the Middle Age, connected to a religious miracle. Today, however, flexible glass is no more a myth but a reality due to the fact that current technology permits us to produce micron-thick glass sheets, and any ultra-thin material can be bent. Flexibility is coming from the present capability to manufacture glass sheets at a tens of microns thickness coupled with the development of strengthening methods; it is also worth highlighting that, on the micrometric and nanometric scales, silicate glass presents plastic behavior. The most significant application area of flexible glass is consumer electronics, for the displays of smartphones and tablets, and for wearables, where flexibility and durability are crucial. Automotive and medical sectors are also gaining importance. A very relevant field, both for the market and the technological progress, is solar photovoltaics; mechanical flexibility and lightweight have allowed solar cells to evolve toward devices that possess the advantages of conformability, bendability, wearability, and moldability. The mature roll-to-roll manufacturing technology also allows for high-performance devices at a low cost. Here, a brief overview of the history of flexible glass and some examples of its application in solar photovoltaics are presented. Full article
(This article belongs to the Special Issue Advances in Electronic and Photonic Materials)
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22 pages, 6240 KiB  
Review
Structure and Morphological Properties of Cobalt-Oxide-Based (Co3O4) Materials as Electrodes for Supercapacitors: A Brief Review
by Maxwell F. L. Garcia, Luis C. C. Arzuza, Gelmires A. Neves, Francisco J. A. Loureiro, Marco A. Morales, Daniel A. Macedo, Helio L. Lira and Romualdo R. Menezes
Materials 2025, 18(2), 413; https://doi.org/10.3390/ma18020413 - 17 Jan 2025
Viewed by 1170
Abstract
Over the past 15 years, there has been a significant increase in the search for environmentally friendly energy sources, and transition-metal-based energy storage devices are leading the way in these new technologies. Supercapacitors are attractive in this regard due to their superior energy [...] Read more.
Over the past 15 years, there has been a significant increase in the search for environmentally friendly energy sources, and transition-metal-based energy storage devices are leading the way in these new technologies. Supercapacitors are attractive in this regard due to their superior energy storage capabilities. Electrode materials, which are crucial components of supercapacitors, such as cobalt-oxide-based electrodes, have great qualities for achieving high supercapacitor performance. This brief review presents some basic concepts and recent findings on cobalt-based materials used to fabricate electrodes for supercapacitors. The text also clarifies how morphological characteristics typically influence certain properties. The inner surface of the electrode exhibits several properties that change to provide it a great boost in specific capacitance and charge storage. Porous structures with defined pore sizes and shapes and high surface areas are important features for improving electrochemical properties. Finally, we present some perspectives for the development of cobalt-oxide-based supercapacitors, focusing on their structure and properties. Full article
(This article belongs to the Special Issue Advances in Electronic and Photonic Materials)
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