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Electronic, Optical and Magnetic Properties of Low-Dimensional Materials
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Electronic, Optical and Magnetic Properties of Low-Dimensional Materials

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

Deadline for manuscript submissions: 10 September 2024 | Viewed by 4244

Special Issue Editors

Dr. Chao-Yao Yang

E-Mail Website
Guest Editor
Dept. Material Science and Engineering, National Yang Ming Chiao Tung University, Taipei City 112304, Taiwan
Interests: spintronics; topological insulator; two-dimensional materials; valleytronics; magnetics; antiferromagnet; X-ray spectroscopy
Dr. Sidong Lei

E-Mail Website
Guest Editor
Dept. Physics and Astronomy, Georgia State University, Atlanta, GA 30302, USA
Interests: 2D materials; interfacial physics and chemistry; quantum heterostructures; functional low-dimensional systems

Special Issue Information

Dear Colleagues,

Two-dimensional physics has attracted wide scientific interest because of the structural conifnement leading to peculiar properties on many aspects such as transport, magnetism, optics, and valleytronics. Benefitted by the breakthroughs with regards to material processing and structural engineering, an increasing number of materials and their combinations have sparked new ideas on how to expand the scope of exploring more physics in low dimensionality and open new horizons in this research area. This Special Issue aims to improve understanding around two-dimensional materials with several perspectives covering physical properties, processing and engineering, and the ways of characterization. Metallic to insulative phase transition in two-dimensional materials is electrically critical and enables the tuning of conducitivity for transport. The phase transition, along with the changes in electronic structure, can be resolved by using spectroscopy, so the associated optical properties will be concerned. The magnetism of two-dimensional materials, especially in the form of heterostructure, may be more non-trivial, which promotes the potential spintronic applicaions. Furthermore, the valleytronic properties, as a result of the combined inversion symmetry breaking and strong spin-orbital coupling, are considered a contender for memory technology beyond Moore's Law. All the physical properties are correlated with the crystallographic growth and the microstructural engineering. Therefore, a new strategy of fabricating two-dimensional materials should accelerate exploration into novel physical properties and applications. Finally, newly developed characterization is required to bridge materials and properties. This Special Issue will also report and review the current development in the characterization.

Dr. Chao-Yao Yang
Dr. Sidong Lei
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. 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

  • two-dimensional physics
  • phase transition
  • transport
  • magnetism
  • optics
  • valleytronics
  • spintronics
  • crystallog-raphy
  • microstructure

Published Papers (3 papers)

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Research

12 pages, 2245 KiB  
Article
Reduction-Induced Magnetic Behavior in LaFeO3−δ Thin Films
by Nathan D. Arndt, Eitan Hershkovitz, Labdhi Shah, Kristoffer Kjærnes, Chao-Yao Yang, Purnima P. Balakrishnan, Mohammed S. Shariff, Shaun Tauro, Daniel B. Gopman, Brian J. Kirby, Alexander J. Grutter, Thomas Tybell, Honggyu Kim and Ryan F. Need
Materials 2024, 17(5), 1188; https://doi.org/10.3390/ma17051188 - 04 Mar 2024
Viewed by 900
Abstract
The effect of oxygen reduction on the magnetic properties of LaFeO3−δ (LFO) thin films was studied to better understand the viability of LFO as a candidate for magnetoionic memory. Differences in the amount of oxygen lost by LFO and its magnetic behavior [...] Read more.
The effect of oxygen reduction on the magnetic properties of LaFeO3−δ (LFO) thin films was studied to better understand the viability of LFO as a candidate for magnetoionic memory. Differences in the amount of oxygen lost by LFO and its magnetic behavior were observed in nominally identical LFO films grown on substrates prepared using different common methods. In an LFO film grown on as-received SrTiO3 (STO) substrate, the original perovskite film structure was preserved following reduction, and remnant magnetization was only seen at low temperatures. In a LFO film grown on annealed STO, the LFO lost significantly more oxygen and the microstructure decomposed into La- and Fe-rich regions with remnant magnetization that persisted up to room temperature. These results demonstrate an ability to access multiple, distinct magnetic states via oxygen reduction in the same starting material and suggest LFO may be a suitable materials platform for nonvolatile multistate memory. Full article
(This article belongs to the Special Issue Electronic, Optical and Magnetic Properties of Low-Dimensional Materials)
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12 pages, 3246 KiB  
Article
Paramagnetism in Microwave-Synthesized Metal-Free Nitrogen-Doped Graphene Quantum Dots
by Flavia P. N. Inbanathan, Katherine Leslee A. Cimatu, David C. Ingram, Uriel Joseph Erasquin, Kiran Dasari, Muhammad Shehzad Sultan, Muhammad Sajjad, Vladimir Makarov, Brad R. Weiner, Gerardo Morell, Payman Sharifi Abdar and Wojciech M. Jadwisienczak
Materials 2023, 16(9), 3410; https://doi.org/10.3390/ma16093410 - 27 Apr 2023
Cited by 1 | Viewed by 1842
Abstract
Nitrogen-doped graphene quantum dots (NGQDs) have gained significant attention due to their various physical and chemical properties; however, there is a gap in the study of NGQDs’ magnetic properties. This work adds to the efforts of bridging the gap by demonstrating the room [...] Read more.
Nitrogen-doped graphene quantum dots (NGQDs) have gained significant attention due to their various physical and chemical properties; however, there is a gap in the study of NGQDs’ magnetic properties. This work adds to the efforts of bridging the gap by demonstrating the room temperature paramagnetism in GQDs doped with Nitrogen up to 3.26 at.%. The focus of this experimental work was to confirm the paramagnetic behavior of metal free NGQDs resulting from the pyridinic N configuration in the GQDs host. Metal-free nitrogen-doped NGQDs were synthesized using glucose and liquid ammonia as precursors by microwave-assisted synthesis. This was followed by dialysis filtration. The morphology, optical, and magnetic properties of the synthesized NGQDs were characterized carefully through atomic force microscopy (AFM), transmission electron microscopy (TEM)), UV-VIS spectroscopy, fluorescence, X-ray photon spectroscopy (XPS), and vibrating sample magnetometer (VSM). The high-resolution TEM analysis of NGQDs showed that the NGQDs have a hexagonal crystalline structure with a lattice fringe of ~0.24 nm of (1120) graphene plane. The N1s peak using XPS was assigned to pyridinic, pyrrolic, graphitic, and oxygenated NGQDs. The magnetic study showed the room-temperature paramagnetic behavior of NGQDs with pyridinic N configuration, which was found to have a magnetization of 20.8 emu/g. Full article
(This article belongs to the Special Issue Electronic, Optical and Magnetic Properties of Low-Dimensional Materials)
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14 pages, 6099 KiB  
Article
Characterization of the Nano-Rod Arrays of Pyrite Thin Films Prepared by Aqueous Chemical Growth and a Subsequent Sulfurization
by Mohammad Talaeizadeh, Seyyed Ali Seyyed Ebrahimi, Payam Khosravi and Bejan Hamawandi
Materials 2022, 15(19), 6946; https://doi.org/10.3390/ma15196946 - 06 Oct 2022
Cited by 1 | Viewed by 1062
Abstract
Pyrite is an earth-abundant and low-cost material with a specific collection of properties including a low band gap and high absorption coefficient of solar light. These properties make pyrite a good choice in a wide variety of applications such as catalysts, batteries, and [...] Read more.
Pyrite is an earth-abundant and low-cost material with a specific collection of properties including a low band gap and high absorption coefficient of solar light. These properties make pyrite a good choice in a wide variety of applications such as catalysts, batteries, and photovoltaic devices. A thin film composed of vertically aligned pyrite nano-rods was processed via a hydration-condensation method followed by subsequent aging and sulfurization. In this process, no ionic salt was used which resulted in a lower cost process with a lower level of impurities. Field emission scanning electron microscopy, X-ray diffraction, and Raman spectroscopy analyses were used to characterize the thin films in different steps of the process. The major impurity of the final thin films was the marcasite phase according to the Raman analysis which could be minimized by lowering sulfurizing time to about 60 min. In addition, after structural, electrical, and optical characterization of thin films, these layers’ performances in a photovoltaic device were also examined. After deposition of a thin aluminum layer, Schottky-type solar cells of pyrite formed which were then illuminated to measure their current-voltage characteristics. The results show that a combination of low-cost materials and a low-cost preparation method is applicable for building future solar cells. Full article
(This article belongs to the Special Issue Electronic, Optical and Magnetic Properties of Low-Dimensional Materials)
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