Exploring the Nanoscale Diversity of Metal Oxides and Their Advanced Electronic and Energy Storage Applications

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

Deadline for manuscript submissions: 31 October 2025 | Viewed by 445

Special Issue Editor


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Guest Editor
Physics Center of Minho and Porto Universities (CF-UM-UP), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
Interests: nanomaterials; nanocomsoites; electronic devices; ferroelectricity; photocatalysis; gas sensors; matel oxides

Special Issue Information

Dear Colleagues,

The exploration of metal oxides in their diverse forms has become increasingly vital in the development of advanced electronic and energy storage applications. Metal oxides, such as zinc oxide (ZnO), titanium dioxide (TiO2), and nickel oxide (NiO), have demonstrated significant potential due to their unique electrical, optical, and catalytic properties. Their applications range from thin-film transistors and solar cells to supercapacitors and batteries. For instance, ZnO nanoparticles have been widely used in optoelectronic devices due to their high electron mobility and wide bandgap, while TiO2 nanostructures are extensively utilized in photocatalysis and solar energy conversion.

This Special Issue of Nanomaterials aims to present the current state of the art in the research and application of metal oxides, focusing on their various forms, including nanoparticles, nanostructures, nanocomposites, and thin films. We seek to highlight cutting-edge research that explores the synthesis, characterization, and innovative applications of these materials in electronic devices and energy storage systems.

We invite contributions that address topics such as the enhancement of electronic properties through morphological control, the development of nanocomposites for improved energy storage performance, and the use of thin films in next-generation electronic applications. By gathering insights from leading researchers in the field, we aim to provide a comprehensive overview of the advancements and challenges associated with metal oxides in various states.

Dr. Majdi Benamara
Guest Editor

Manuscript Submission Information

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Keywords

  • metal oxides
  • nanoparticles
  • nanostructures
  • nanocomposites
  • thin films
  • electronic applications
  • energy storage

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Published Papers (1 paper)

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Research

19 pages, 6677 KiB  
Article
Tunable Electrical Properties of Cobalt-Doped Maghemite Nanoparticles for Advanced Resistive and Thermistor Applications
by Mokhtar Hjiri, Sonia Soltani, Anouar Jbeli, Nazir Mustapha, Nouf Ahmed Althumairi, Majdi Benamara and Manuel Almeida Valente
Nanomaterials 2025, 15(7), 534; https://doi.org/10.3390/nano15070534 - 1 Apr 2025
Viewed by 349
Abstract
Maghemite (γ-Fe2O3) nanoparticles have attracted considerable interest for electronic applications due to their tunable electrical properties. Doping strategies offer an effective way to optimize their resistive behavior for use in electronic devices. In this study, cobalt (Co) was incorporated [...] Read more.
Maghemite (γ-Fe2O3) nanoparticles have attracted considerable interest for electronic applications due to their tunable electrical properties. Doping strategies offer an effective way to optimize their resistive behavior for use in electronic devices. In this study, cobalt (Co) was incorporated into γ-Fe2O3 to enhance its resistive properties. X-ray diffraction (XRD) confirmed the retention of the cubic P4332 phase, with Co doping inducing subtle lattice distortions due to ionic substitution. Scanning and transmission electron microscopy (SEM/TEM) revealed morphological changes, where Co incorporation influenced particle shape and size distribution. Electrical conductivity analysis demonstrated a decrease in both AC and DC conductivity with the increase in Co content, indicating enhanced resistive behavior. The increase in activation energy suggests a reduction in charge carrier mobility, leading to higher resistivity. Impedance spectroscopy further confirmed increased real and imaginary impedance values, reinforcing the role of Co in suppressing charge transport. These results position cobalt-doped maghemite as a promising material for electronic resistive devices, such as tunable resistors and negative temperature coefficient (NTC) thermistors, where controlled conductivity and stable resistive behavior are essential. Full article
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