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Materials
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Facile Synthesis and Applications of Doped Metal Oxide Nanomaterials
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Facile Synthesis and Applications of Doped Metal Oxide Nanomaterials

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

Deadline for manuscript submissions: closed (20 November 2023) | Viewed by 3749

Special Issue Editors

Dr. S. Girish Kumar

E-Mail Website
Guest Editor
School of Engineering and Technology, CMR University, Bengaluru Main Campus, Bengaluru 562149, India
Interests: defect chemistry; doped semiconductors; Fenton’s reactions; heterostructures; photocatalysis; 2D nanomaterials; solution-phase chemical synthesis of nanomaterials
Fayal Dsouza

E-Mail Website
Guest Editor Assistant
Assistant Professor, Department of Chemistry, School of Engineering and Technology, Bagaluru Campus, CMR University, Karnataka, India
Interests: Fenton's reactions; iron-oxide nanomaterials; sol-gel synthesis; composite structures; photocatalysis

Special Issue Information

Dear Colleagues,

Metal oxides are explored as functional materials. In order to further improve the performance of metal oxide nanomaterials, doping/co-doping with impurities to alter the bulk structures of the host matrix has been a promising approach for many decades. In this context, this Special Issue is intended to be a collection of articles/reviews focusing on the facile synthesis and applications of doped metal oxides. The articles submitted must elegantly spotlight the facile preparation method, and the relevant material characterization related to the structural, morphological, and band gap response properties should be carefully dealt with to provide clear-cut insights into the doping effects. In particular, the co-doping process would be of more interest as it unfolds the doping mechanisms to a larger extent.

Dr. S. Girish Kumar
Guest Editor

Fayal Dsouza
Guest Editor Assistant

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

  • doping process
  • metal oxides
  • material characterization
  • synthesis
  • nanomaterials
  • applications

Published Papers (2 papers)

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Research

15 pages, 14898 KiB  
Article
Composition and Surface Optical Properties of GaSe:Eu Crystals before and after Heat Treatment
by Veaceslav Sprincean, Haoyi Qiu, Tim Tjardts, Oleg Lupan, Dumitru Untilă, Cenk Aktas, Rainer Adelung, Liviu Leontie, Aurelian Carlescu, Silviu Gurlui and Mihail Caraman
Materials 2024, 17(2), 405; https://doi.org/10.3390/ma17020405 - 13 Jan 2024
Viewed by 932
Abstract
This work studies the technological preparation conditions, morphology, structural characteristics and elemental composition, and optical and photoluminescent properties of GaSe single crystals and Eu-doped β–Ga2O3 nanoformations on ε–GaSe:Eu single crystal substrate, obtained by heat treatment at 750–900 °C, [...] Read more.
This work studies the technological preparation conditions, morphology, structural characteristics and elemental composition, and optical and photoluminescent properties of GaSe single crystals and Eu-doped β–Ga2O3 nanoformations on ε–GaSe:Eu single crystal substrate, obtained by heat treatment at 750–900 °C, with a duration from 30 min to 12 h, in water vapor-enriched atmosphere, of GaSe plates doped with 0.02–3.00 at. % Eu. The defects on the (0001) surface of GaSe:Eu plates serve as nucleation centers of β–Ga2O3:Eu crystallites. For 0.02 at. % Eu doping, the fundamental absorption edge of GaSe:Eu crystals at room temperature is formed by n = 1 direct excitons, while at 3.00 at. % doping, Eu completely shields the electron–hole bonds. The band gap of nanostructured β–Ga2O3:Eu layer, determined from diffuse reflectance spectra, depends on the dopant concentration and ranges from 4.64 eV to 4.87 eV, for 3.00 and 0.05 at. % doping, respectively. At 0.02 at. % doping level, the PL spectrum of ε–GaSe:Eu single crystals consists of the n = 1 exciton band, together with the impurity band with a maximum intensity at 800 nm. Fabry–Perrot cavities with a width of 9.3 μm are formed in these single crystals, which determine the interference structure of the impurity PL band. At 1.00–3.00 at. % Eu concentrations, the PL spectra of GaSe:Eu single crystals and β–Ga2O3:Eu nanowire/nanolamellae layers are determined by electronic transitions of Eu2+ and Eu3+ ions. Full article
(This article belongs to the Special Issue Facile Synthesis and Applications of Doped Metal Oxide Nanomaterials)
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19 pages, 9321 KiB  
Article
Effective Attenuation of Electromagnetic Waves by Synergetic Effect of α-Fe2O3 and MWCNT/Graphene in LDPE-Based Composites for EMI Applications
by Praveen Manjappa, Hari Krishna Rajan, Mamatha Gowdaru Mahesh, Karthikeya Gulur Sadananda, Manjunatha Channegowda, Girish Kumar Shivashankar and Nagabhushana Bhangi Mutt
Materials 2022, 15(24), 9006; https://doi.org/10.3390/ma15249006 - 16 Dec 2022
Cited by 12 | Viewed by 2144
Abstract
In this study, a polymer nanocomposite is synthesized using magnetic and conducting fillers for enhanced electromagnetic interference (EMI) shielding. Alfa-ferrite (α-Fe2O3) nanoparticles with minimal multiwalled carbon nanotube (MWCNT) as low as 5 weight % in combination with variable concentrations [...] Read more.
In this study, a polymer nanocomposite is synthesized using magnetic and conducting fillers for enhanced electromagnetic interference (EMI) shielding. Alfa-ferrite (α-Fe2O3) nanoparticles with minimal multiwalled carbon nanotube (MWCNT) as low as 5 weight % in combination with variable concentrations of graphene nanoplatelets (GNP) are used as fillers in low-density polyethylene (LDPE) polymer matrix. Nanofillers and the polymer matrix are characterized by various techniques such as XRD, SEM, color mapping, EDAX, TGA, etc. The EMI shielding efficiency of the LDPE-based nanocomposites is tested using Vector Network Analyzer (VNA). The results showed that composite with LDPE:MWCNT:GNP:α-FO-50:5:40:5 displayed enhanced EMI shielding (in X-band (8.2–12.4 GHz) compared to other concentrations studied. This is due to the superior ohmic, dielectric, and magnetic losses at this particular composition and to the synergism amongst the filler. An attenuation of 99.99% was achieved for 5% α-Fe2O3. The mechanistic aspects of the shielding are discussed using permittivity, conductivity, and attenuation. Full article
(This article belongs to the Special Issue Facile Synthesis and Applications of Doped Metal Oxide Nanomaterials)
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