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Nano-Engineering of Functional Oxides: Synthesis, Functional Properties and Applications
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Nano-Engineering of Functional Oxides: Synthesis, Functional Properties and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Thin Films and Interfaces".

Deadline for manuscript submissions: closed (10 May 2023) | Viewed by 8061

Special Issue Editors

Dr. Adrien Carretero-Genevrier

E-Mail Website
Guest Editor
IES (Institut d'Electronique et des Systèmes), CNRS UMR 5214 / Université Montpellier, 860 rue de Saint Priest, Bâtiment 5, 34097 Montpellier, France
Interests: functional oxides nanostructures; piezoelectricity; ferroelectricity; devices; thin films; nano-engineering
Special Issues, Collections and Topics in MDPI journals
Dr. César Magén

E-Mail Website
Guest Editor
1. Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
2. Laboratorio de Microscopías Avanzadas (LMA), Universidad de Zaragoza, 50018 Zaragoza, Spain
Interests: transmission electron microscopy; nanomagnetism; complex oxides; multiferroics; epitaxial thin films; spintronics

Special Issue Information

Dear Colleagues,

The Special Issue, “Nano-Engineering of Functional Oxides: Synthesis, Functional Properties and Applications”, will address developments in the smart design and advanced characterization of functional nanoscale oxide materials and devices for nano-electronics, data storage, energy conversion/storage, sensors, transducers and actuators, among other applications. Oxide nanostructures have been demonstrated to be useful functional components for a variety of nanoscale devices. There are hundreds of possible combinations of metal oxides structures, leading to tremendous solid-state chemistry diversity, which can promote unexpected and fascinating enhanced physical properties, such as magnetism, ferroelectricity, multiferroicity, superconductivity, ionic conductivity, etc. These nanoscale functional oxides have unique chemical and physical properties that, in a way, diversify the functionalities of silicon technology, for example, in the field of microelectronics. Great progress has been made in recent years on the strong impact of interfaces, topology, symmetry, dimensionality and quantum phenomena at the nanoscale, on the physical properties of nanoscale oxides and their possible applications. This Special Issue at the interface between nanocharacterization and top-down and bottom-up nanofabrication techniques will address a variety of skills, ranging from the synthesis of 1D, 2D and 3D functional oxides nanostructures to the design of sensors and harvesting energy devices, through advanced structural and physical characterizations at the nanoscale. Thus, articles and reviews dealing with chemical and physical thin film deposition, inorganic chemistry, magnetism, piezoelectrics, ferroelectrics and multiferroics are welcome.

Dr. Adrian Carretero Genevrier
Dr. César Magén
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

  • Functional oxides
  • Nanostructures
  • Piezoelectricity
  • Ferroelectricity
  • Multiferroics
  • Devices
  • Thin films
  • Oxide nanowires
  • Nano-engineering

Published Papers (4 papers)

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Research

19 pages, 8271 KiB  
Article
Overview of the Structural, Electronic and Optical Properties of the Cubic and Tetragonal Phases of PbTiO3 by Applying Hubbard Potential Correction
by Issam Derkaoui, Mohamed Achehboune, Roberts I. Eglitis, Anatoli I. Popov and Abdellah Rezzouk
Materials 2023, 16(12), 4302; https://doi.org/10.3390/ma16124302 - 10 Jun 2023
Cited by 4 | Viewed by 1507
Abstract
We have performed a systematic study resulting in detailed information on the structural, electronic and optical properties of the cubic (Pm3¯m) and tetragonal (P4mm) phases of PbTiO3 applying the GGA/PBE approximation with and without the [...] Read more.
We have performed a systematic study resulting in detailed information on the structural, electronic and optical properties of the cubic (Pm3¯m) and tetragonal (P4mm) phases of PbTiO3 applying the GGA/PBE approximation with and without the Hubbard U potential correction. Through the variation in Hubbard potential values, we establish band gap predictions for the tetragonal phase of PbTiO3 that are in rather good agreement with experimental data. Furthermore, the bond lengths for both phases of PbTiO3 were assessed with experimental measurements, confirming the validity of our model, while chemical bond analysis highlights the covalent nature of the Ti–O and Pb–O bonds. In addition, the study of the optical properties of the two phases of PbTiO3, by applying Hubbard’ U potential, corrects the systematic inaccuracy of the GGA approximation, as well as validating the electronic analysis and offering excellent concordance with the experimental results. Therefore, our results underline that the GGA/PBE approximation with the Hubbard U potential correction could be an effective method for obtaining reliable band gap predictions with moderate computational cost. Therefore, these findings will enable theorists to make use of the precise values of these two phases’ gap energies to enhance PbTiO3’s performance for new applications. Full article
(This article belongs to the Special Issue Nano-Engineering of Functional Oxides: Synthesis, Functional Properties and Applications)
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16 pages, 6071 KiB  
Article
Effect of Ethylene Glycol: Citric Acid Molar Ratio and pH on the Morphology, Vibrational, Optical and Electronic Properties of TiO2 and CuO Powders Synthesized by Pechini Method
by Mónica A. Vargas-Urbano, Lorena Marín, Winny Mónica Castillo, Luis Alfredo Rodríguez, César Magén, Milton Manotas-Albor, Jesús Evelio Diosa and Katherine Gross
Materials 2022, 15(15), 5266; https://doi.org/10.3390/ma15155266 - 30 Jul 2022
Viewed by 1882
Abstract
High-purity TiO2 and CuO powders were synthesized by the Pechini method, an inexpensive and easy-to-implement procedure to synthetize metal oxides. The variables of synthesis were the ethylene glycol:citric acid molar ratio and the pH. High reproducibility of the anatase and tenorite phase [...] Read more.
High-purity TiO2 and CuO powders were synthesized by the Pechini method, an inexpensive and easy-to-implement procedure to synthetize metal oxides. The variables of synthesis were the ethylene glycol:citric acid molar ratio and the pH. High reproducibility of the anatase and tenorite phase was obtained for all synthesis routes. The degree of purity of the powders was confirmed by XRD, FTIR, UV-Vis absorption and XPS spectra. SEM and TEM images revealed the powders are composed of micrometer grains that can have a spherical shape (only in the TiO2) or formed by a non-compacted nanocrystalline conglomerate. FTIR spectra only displayed vibrational modes associating TiO2 and CuO with nanoparticle behavior. UV-Vis absorption spectra revealed the values of maximum absorbance percentage of both systems are reached in the ultraviolet region, with percentages above 83% throughout the entire visible light spectrum for the CuO system, a relevant result for solar cell applications. Finally, XPS experiments allow the observation of the valence bands and the calculation of the energy bands of all oxides. Full article
(This article belongs to the Special Issue Nano-Engineering of Functional Oxides: Synthesis, Functional Properties and Applications)
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12 pages, 6330 KiB  
Article
Self-Powered Photodetector Based on FTO/n-TiO2/p-CuMnO2 Transparent Thin Films
by Carmen Lazau, Mircea Nicolaescu, Corina Orha, Viorel Şerban and Cornelia Bandas
Materials 2022, 15(15), 5229; https://doi.org/10.3390/ma15155229 - 28 Jul 2022
Cited by 4 | Viewed by 1684
Abstract
A self-powered photodetector with the FTO/n-TiO2/p-CuMnO2 configuration, representing the novelty of the work, was successfully achieved for the first time and presumes two steps: deposition of the n-type semiconductor (TiO2) by the doctor [...] Read more.
A self-powered photodetector with the FTO/n-TiO2/p-CuMnO2 configuration, representing the novelty of the work, was successfully achieved for the first time and presumes two steps: deposition of the n-type semiconductor (TiO2) by the doctor blade method and of the p-type semiconductor (CuMnO2) by the spin coating technique, respectively. Investigation techniques of the structural and morphological characteristics of the as-synthesized heterostructures, such as XRD, UV-VIS analysis, and SEM/EDX and AFM morphologies, were used. The I-t measurements of the photodetector showed that the responsivity in the self-powered mode was 2.84 × 107 A W−1 cm2 and in the 1 V bias mode it was 1.82 × 106 A W−1 cm2. Additionally, a self-powered current of 14.2 nA was generated under UV illumination with an intensity of 0.1 mW/cm2. Furthermore, under illumination conditions, the response time (tres) and the recovery time (trec) of the sensor exhibited a good response; thus, tres = 7.30 s and trec = 0.4 s for the self-powered mode, and in the 1 V bias mode, these were tres = 15.16 s and trec = 2.18 s. The above results show that the transparent heterojunction device of n-TiO2/p-CuMnO2 exhibited a self-powered ultraviolet photodetector with high sensitivity. Full article
(This article belongs to the Special Issue Nano-Engineering of Functional Oxides: Synthesis, Functional Properties and Applications)
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8 pages, 1752 KiB  
Article
Low-Temperature Dielectric Response of Strontium Titanate Thin Films Manipulated by Zn Doping
by Olena Okhay, Paula M. Vilarinho and Alexander Tkach
Materials 2022, 15(3), 859; https://doi.org/10.3390/ma15030859 - 23 Jan 2022
Cited by 3 | Viewed by 2160
Abstract
The voltage dependence of the dielectric permittivity ε′ and the low dielectric loss tanδ of incipient ferroelectrics have drawn vast attention to the use of these materials for the development of tuning elements in electronics and telecommunications. Here, we study the [...] Read more.
The voltage dependence of the dielectric permittivity ε′ and the low dielectric loss tanδ of incipient ferroelectrics have drawn vast attention to the use of these materials for the development of tuning elements in electronics and telecommunications. Here, we study the DC electric field dependence of low-temperature ε′ in ~320 nm thick sol-gel-derived SrTi1−xZnxO3−δ thin films with x = 0.01 and 0.05, deposited on Pt/TiO2/SiO2/Si substrates. Incorporation of Zn onto Ti sites is found to decrease ε′ compared to undoped SrTiO3 films, while increasing the relative tunability nr up to ~32.9% under a DC electric field of 125 kV/cm at low temperatures. The hysteresis-free variation in ε′ with electric field and tanδ values below 0.6% observed for SrTi1−xZnxO3−δ film with x = 0.01 make this compound more attractive for tunable device applications. Full article
(This article belongs to the Special Issue Nano-Engineering of Functional Oxides: Synthesis, Functional Properties and Applications)
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