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Nanomaterials
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Functional Oxides with Technological Interest
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Functional Oxides with Technological Interest

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Inorganic Materials and Metal-Organic Frameworks".

Deadline for manuscript submissions: 10 August 2024 | Viewed by 2573

Special Issue Editor

Dr. Julio Ramirez-Castellanos

E-Mail Website
Guest Editor
Department of Inorganic Chemistry, Faculty of Chemical Sciences, University Complutense Madrid, 28040 Madrid, Spain
Interests: functional inorganic materials; nanomaterials; electron mycroscopy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

During the last few years, functional oxides have attracted a considerable amount of attention due to their potential applications. Furthermore, most of them show interesting physical and chemical properties, which can be improved by choosing the appropriate synthesis method. In this sense, obtaining these solids with interesting properties is one of the most important areas of solid-state chemistry. At this point, it is important to point out that the relationships between chemical composition-structure/microstructure and properties must be studied in detail in order to understand and improve the final properties of these materials, and to make them more attractive from a technological point of view. This Special Issue is open to contributions addressing functional inorganic oxides, such as nanomaterials, ceramics, single crystals, or thin films, among others, with various catalytic or energy applications, including batteries, solar cells, fuel cells, thermoelectric, piezoelectric, magnetic properties, and many other areas.

Dr. Julio Ramirez-Castellanos 
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. 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

  • functional oxides
  • nanomaterials
  • properties
  • technological applications
  • structure and microstructure

Published Papers (2 papers)

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Research

10 pages, 2308 KiB  
Article
Characterization of Tunneled Wide Band Gap Mixed Conductors: The Na2O-Ga2O3-TiO2 System
by Javier García-Fernández, María Hernando, Almudena Torres-Pardo, María Luisa López, María Teresa Fernández-Díaz, Qing Zhang, Osamu Terasaki, Julio Ramírez-Castellanos and José M. González-Calbet
Nanomaterials 2023, 13(14), 2054; https://doi.org/10.3390/nano13142054 - 12 Jul 2023
Viewed by 870
Abstract
This article focuses on the Na2O-Ga2O3-TiO2 system, which is barely explored in the study of transparent conductive oxides (TCOs). NaxGa4+xTin−4−xO2n−2 (n = 5, 6, and 7 and x ≈ [...] Read more.
This article focuses on the Na2O-Ga2O3-TiO2 system, which is barely explored in the study of transparent conductive oxides (TCOs). NaxGa4+xTin−4−xO2n−2 (n = 5, 6, and 7 and x ≈ 0.7–0.8) materials were characterized using neutron powder diffraction and aberration-corrected scanning transmission electron microscopy. Activation energy, as a function of different structures depending on tunnel size, shows a significant improvement in Na+ ion conduction from hexagonal to octagonal tunnels. New insights into the relationship between the crystal structure and the transport properties of TCOs, which are crucial for the design and development of new optoelectronic devices, are provided. Full article
(This article belongs to the Special Issue Functional Oxides with Technological Interest)
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8 pages, 1783 KiB  
Article
Tuning Magnetoconductivity in LaMnO3 NPs through Cationic Vacancy Control
by Antonio Hernando, M. Luisa Ruiz-González, Omar Diaz, José M. Alonso, José L. Martínez, Andrés Ayuela, José M. González-Calbet and Raquel Cortés-Gil
Nanomaterials 2023, 13(10), 1601; https://doi.org/10.3390/nano13101601 - 10 May 2023
Viewed by 883
Abstract
The inclusion of La-Mn vacancies in LaMnO3 nanoparticles leads to a noticeable change in conductivity behavior. The sample retains its overall insulator characteristic, with a typical thermal activation mechanism at high temperatures, but it presents high magnetoconductivity below 200 K. The activation [...] Read more.
The inclusion of La-Mn vacancies in LaMnO3 nanoparticles leads to a noticeable change in conductivity behavior. The sample retains its overall insulator characteristic, with a typical thermal activation mechanism at high temperatures, but it presents high magnetoconductivity below 200 K. The activation energy decreases linearly with the square of the reduced magnetization and vanishes when the sample is magnetized at saturation. Therefore, it turns out that electron hopping between Mn3+ and Mn4+ largely contributes to the conductivity below the Curie temperature. The influence of the applied magnetic field on conductivity also supports the hypothesis of hopping contribution, and the electric behavior can be explained as being due to an increase in the hopping probability via spin alignment. Full article
(This article belongs to the Special Issue Functional Oxides with Technological Interest)
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