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Nanomaterials
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Metallic Oxide Nanostructures
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Metallic Oxide Nanostructures

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 15473

Special Issue Editor

Dr. Mikhael Bechelany

E-Mail Website
Guest Editor
Institut Européen des Membranes (IEMM, ENSCM UM CNRS UMR5635), Montpellier, France
Interests: thin films; 2D materials; atomic layer deposition; nanostructure; nanocomposites; membrane; electrospinning; 3D printing; photocatalysis; biosensor; sensor; water splitting
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,                

Metal oxide nanomaterials have attracted a lot of interest due to their outstanding chemical, physical, and electronic properties compared with those of their bulk counterparts. Metal oxide nanomaterials are versatile materials that can be tuned for potential applications into functional devices in different areas.

The aim of this Special Issue is to collect high-quality contributions on the synthesis and modification of Metallic Oxide Nanostructures. It will deal with the design of new nanostructures by tuning their morphology, geometry, crystallinity, and interfaces. The relation between these parameters and the physical-chemical properties will also be investigated. New applications in different fields such as health, environment, and renewable energy will be as well explored.

Relevant contributions related to prospective materials design, original materials properties, and innovative characterization techniques will also be considered.

Dr. Mikhael Bechelany
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

  • Metal oxide
  • Nanomaterial
  • 1D nanostructures
  • Thin film
  • Interface
  • Surface modification
  • Nanostructured material
  • Energy
  • Health
  • Environment

Related Special Issue

Published Papers (5 papers)

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Research

11 pages, 980 KiB  
Article
Crystallization in Zirconia Film Nano-Layered with Silica
by Brecken Larsen, Christopher Ausbeck, Timothy F. Bennet, Gilberto DeSalvo, Riccardo DeSalvo, Tugdual LeBohec, Seth Linker, Marina Mondin and Joshua Neilson
Nanomaterials 2021, 11(12), 3444; https://doi.org/10.3390/nano11123444 - 19 Dec 2021
Cited by 4 | Viewed by 2329
Abstract
Gravitational waves are detected using resonant optical cavity interferometers. The mirror coatings’ inherent thermal noise and photon scattering limit sensitivity. Crystals within the reflective coating may be responsible for either or both noise sources. In this study, we explored crystallization reduction in zirconia [...] Read more.
Gravitational waves are detected using resonant optical cavity interferometers. The mirror coatings’ inherent thermal noise and photon scattering limit sensitivity. Crystals within the reflective coating may be responsible for either or both noise sources. In this study, we explored crystallization reduction in zirconia through nano-layering with silica. We used X-ray diffraction (XRD) to monitor crystal growth between successive annealing cycles. We observed crystal formation at higher temperatures in thinner zirconia layers, indicating that silica is a successful inhibitor of crystal growth. However, the thinnest barriers break down at high temperatures, thus allowing crystal growth beyond each nano-layer. In addition, in samples with thicker zirconia layers, we observe that crystallization saturates with a significant portion of amorphous material remaining. Full article
(This article belongs to the Special Issue Metallic Oxide Nanostructures)
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19 pages, 9874 KiB  
Article
Nanostructured Molybdenum Oxides from Aluminium-Based Intermetallic Compound: Synthesis and Application in Hydrogen Evolution Reaction
by Deepti Raj, Federico Scaglione, Gianluca Fiore, Federica Celegato and Paola Rizzi
Nanomaterials 2021, 11(5), 1313; https://doi.org/10.3390/nano11051313 - 17 May 2021
Cited by 7 | Viewed by 2934
Abstract
Characterized by a large surface area to volume ratio, nanostructured metal oxides possess unique chemical and physical properties with applications in electronics, catalysis, sensors, etc. In this study, Mo3Al8, an intermetallic compound, has been used as a precursor to [...] Read more.
Characterized by a large surface area to volume ratio, nanostructured metal oxides possess unique chemical and physical properties with applications in electronics, catalysis, sensors, etc. In this study, Mo3Al8, an intermetallic compound, has been used as a precursor to obtain nanostructured molybdenum oxides. It was prepared into ribbons by arc-melting and melt-spinning techniques. Single and double-step free corrosion of the as-quenched material have been studied in 1 M KOH, 1 M HF and 1.25 M FeCl3 at room temperature. In both cases, nanostructured molybdenum oxides were obtained on a surface layer a few microns thick. Two of the as-prepared samples were tested for their electrocatalytic capability for hydrogen evolution reaction (HER) in 0.5 M H2SO4 giving low onset potential (−50 mV, −45 mV), small Tafel slopes (92 mV dec−1, 9 mV dec−1) and high exchange current densities (0.08 mA cm−2, 0.35 mA cm−2 respectively). The proposed nanostructured molybdenum oxides are cost-effective and sustainable due to the cheap and abundant starting material used and the simple synthetic route, paving the way for their possible application as HER electrocatalysts. Full article
(This article belongs to the Special Issue Metallic Oxide Nanostructures)
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25 pages, 7315 KiB  
Article
Multifunctional Hydroxyapatite/Silver Nanoparticles/Cotton Gauze for Antimicrobial and Biomedical Applications
by Mohamed M. Said, Mohamed Rehan, Said M. El-Sheikh, Magdy K. Zahran, Mohamed S. Abdel-Aziz, Mikhael Bechelany and Ahmed Barhoum
Nanomaterials 2021, 11(2), 429; https://doi.org/10.3390/nano11020429 - 08 Feb 2021
Cited by 45 | Viewed by 4434
Abstract
Medical textiles have played an increasingly important protection role in the healthcare industry. This study was aimed at improving the conventional cotton gauze for achieving advanced biomedical specifications (coloration, UV-protection, anti-inflammation, and antimicrobial activities). These features were obtained by modifying the cotton gauze [...] Read more.
Medical textiles have played an increasingly important protection role in the healthcare industry. This study was aimed at improving the conventional cotton gauze for achieving advanced biomedical specifications (coloration, UV-protection, anti-inflammation, and antimicrobial activities). These features were obtained by modifying the cotton gauze fabrics via in-situ precipitation of hydroxyapatite nanoparticles (HAp NP), followed by in-situ photosynthesis of silver (Ag) NPs with ginger oil as a green reductant with anti-inflammation properties. The HAp-Ag NPs coating provides good UV-protection properties. To further improve the HAp and Ag NPs dispersion and adhesion on the surface, the cotton gauze fabrics were modified by cationization with chitosan, or by partial carboxymethylation (anionic modification). The influence of the cationic and anionic modifications and HAp and Ag NPs deposition on the cotton gauze properties (coloration, UV-protection, antimicrobial activities, and water absorption) was thoroughly assessed. Overall, the results indicate that chemical (anionic and cationic) modification of the cotton gauze enhances HAp and Ag NPs deposition. Chitosan can increase biocompatibility and promotes wound healing properties of cotton gauze. Ag NP deposition onto cotton gauze fabrics brought high antimicrobial activities against Candida albicans, Gram-positive and Gram-negative bacteria, and improved UV protection. Full article
(This article belongs to the Special Issue Metallic Oxide Nanostructures)
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12 pages, 4783 KiB  
Article
An Easy Method of Synthesis CoxOy@C Composite with Enhanced Microwave Absorption Performance
by Wenli Bao, Cong Chen and Zhenjun Si
Nanomaterials 2020, 10(5), 902; https://doi.org/10.3390/nano10050902 - 08 May 2020
Cited by 8 | Viewed by 2139
Abstract
Design of interface-controllable magnetic composite towards the wideband microwave absorber is greatly significance, however, it still remains challenging. Herein, we designed a spherical-like hybrids, using the Co3O4 and amorphous carbon as the core and shell, respectively. Then, the existed Co [...] Read more.
Design of interface-controllable magnetic composite towards the wideband microwave absorber is greatly significance, however, it still remains challenging. Herein, we designed a spherical-like hybrids, using the Co3O4 and amorphous carbon as the core and shell, respectively. Then, the existed Co3O4 core could be totally reduced by the carbon shell, thus in CoxOy core (composed by Co and Co3O4). Of particular note, the ratios of Co and Co3O4 can be linearly tuned, suggesting the controlled interfaces, which greatly influences the interface loss behavior and electromagnetic absorption performance. The results revealed that the minimum reflection loss value (RLmin) of −39.4 dB could be achieved for the optimal CoxOy@C sample under a thin thickness of 1.4 mm. More importantly, the frequency region with RL < −10 dB was estimated to be 4.3 GHz, ranging from 13.7 to 18.0 GHz. The superior wideband microwave absorption performance was primarily attributed to the multiple interfacial polarization and matched impedance matching ability. Full article
(This article belongs to the Special Issue Metallic Oxide Nanostructures)
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16 pages, 5550 KiB  
Article
Carrier Transfer and Capture Kinetics of the TiO2/Ag2V4O11 Photocatalyst
by Yun Zhou, Qiujie Ding, Yuan Wang, Xiaoping OuYang, Lixin Liu, Junyu Li and Bing Wang
Nanomaterials 2020, 10(5), 828; https://doi.org/10.3390/nano10050828 - 27 Apr 2020
Cited by 10 | Viewed by 2337
Abstract
In this paper, TiO2/Ag2V4O11 nanoheterojunctions have been synthesized by hydrothermal methods, which show enhanced photocatalytic activity compared to TiO2 under visible light. Moreover, the TiO2/Ag2V4O11 nanoheterojunction with set [...] Read more.
In this paper, TiO2/Ag2V4O11 nanoheterojunctions have been synthesized by hydrothermal methods, which show enhanced photocatalytic activity compared to TiO2 under visible light. Moreover, the TiO2/Ag2V4O11 nanoheterojunction with set molar ratio of 2:1, referred to as TA2, show the highest visible light photocatalytic activity, which could decompose about 100% RhB molecules within 80 min of irradiation with visible light. Specially, the time-resolved photoluminescence spectrum of TA2 demonstrates that the free exciton recombination occurs in approximately 1.7 ns, and the time scale for Shockley–Read–Hall recombination of photogenerated electrons and holes is prolonged to 6.84 ns. The prolonged timescale of TA2 compared to TiO2 and Ag2V4O11 can be attributed to the carrier separation between nanojunctions and the carrier capture by interfacial defects. Furthermore, the enhanced photocatalytic activity of TiO2/Ag2V4O11 nanoheterojunctions also benefits from the synergistic effect of the broadened absorption region, higher photocarrier generation, longer carrier lifetime, and quicker collection dynamics. Full article
(This article belongs to the Special Issue Metallic Oxide Nanostructures)
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