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Crystals
Special Issues
Research on Complex Oxide Nanomaterials
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Research on Complex Oxide Nanomaterials

A Special Issue of Crystals (ISSN 2073-4352) belonging to the section "Materials for Energy Applications".

Deadline for manuscript submissions: 20 October 2026 | Viewed by 1623

Editors

Dr. Katerina L. Zaharieva

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Guest Editor
Institute of Mineralogy and Crystallography “Acad. I. Kostov”, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Block 107, 1113 Sofia, Bulgaria
Interests: oxide nanomaterials; composites; synthesis and characterization; mechanochemical activation; photocatalysis
Special Issues, Collections and Topics in MDPI journals
Dr. Irina D. Stambolova

E-Mail Website
Guest Editor
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, “Acad. G. Bonchev” St., Block 11, 1113 Sofia, Bulgaria
Interests: oxide nanomaterials; thin oxide films–chemical synthesis; powders; spray pyrolysis; sol-gel; gas sensors; photocatalysts; corrosion resistive coatings; nano-sized materials–synthesis and characterization

Special Issue Information

Dear Colleagues,

The aim of the current Special Issue, “Research on Complex Oxide Nanomaterials”, is dedicated to the synthesis, physicochemical characterization, and various applications of complex oxide nanomaterials. The method for preparation of different complex oxides and composites in various forms such as powders, films, and fibers. The various process parameters influence the properties of obtained complex oxide nanomaterials and composites as well as the synthesis of complex oxides and composite nanomaterials with enhanced photocatalytic activity and/or sorption ability. The phase composition, structure, morphology and other characteristics of prepared complex oxide nanomaterials and composites play a role on their photocatalytic activity, sorption ability, and other properties.

Dr. Katerina L. Zaharieva
Dr. Irina D. Stambolova
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 250 words) can be sent to the Editorial Office for assessment.

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-anonymized peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly 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 2100 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

  • complex oxide
  • nanomaterials
  • composites
  • synthesis
  • physicochemical characterization
  • photocatalysis
  • application

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Published Papers (2 papers)

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Research

19 pages, 6851 KB  
Article
Structural and Optical Investigation of Sol–Gel-Derived TiO2 Films Deposited on Transparent Substrates
by Tatyana Ivanova, Antoaneta Harizanova and Nikolay Petkov
Crystals 2026, 16(8), 525; https://doi.org/10.3390/cryst16080525 - 10 Aug 2026
Viewed by 325
Abstract
In the present work, thin TiO2 films were obtained by the sol–gel spin-coating method on glass and ITO-covered glass substrates. The crystallization evolution of the thin films was studied by the X-ray Diffraction (XRD) technique. The results indicate that the films’ crystalline [...] Read more.
In the present work, thin TiO2 films were obtained by the sol–gel spin-coating method on glass and ITO-covered glass substrates. The crystallization evolution of the thin films was studied by the X-ray Diffraction (XRD) technique. The results indicate that the films’ crystalline structure was greatly affected by substrate type. X-ray photoelectron spectroscopy (XPS) revealed the chemical states of the TiO2 films and proved the formation of TiO2 on ITO substrates. Field Emission Scanning Electron Microscopy (FESEM) showed that the TiO2 films deposited on the ITO glass possessed a uniform and homogeneous surface morphology. The influence of optical properties (transmittance, reflectance, and optical band gap) on substrate type, the number of layers and annealing temperatures was determined. Spectroscopic data confirmed high transparency of the TiO2 films obtained on ITO substrates as the transmittance in the visible spectral range was close to 85%. The obtained results reveal that thin TiO2 films on ITO substrates can be an excellent candidate for photovoltaic and optoelectronic applications. Full article
(This article belongs to the Special Issue Research on Complex Oxide Nanomaterials)
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15 pages, 4103 KB  
Article
Photocatalytic Activity of Cu–TiO2 Nanopowder Under UVA and Sunlight Illumination: Influence of Composition and Calcination Temperature on Charge Transfer
by Khley Cheng, Sothanith Chourn, Vichheka So, Ford David, Solida Long, Sarah Dine, Alex Lemarchand, Mamadou Traore, Christophe Colbeau-Justin and Andrei Kanaev
Crystals 2026, 16(5), 349; https://doi.org/10.3390/cryst16050349 - 19 May 2026
Viewed by 689
Abstract
Cu–TiO2 nanoparticles of a broad range of compositions with 0, 0.002, 0.005, 0.02, 0.05, 0.2, 0.5, 1.0, 2.0, 3.0, 5.0, 7.0 and 10.0 mol% Cu were synthesized via the sol–gel method using copper (II) acetate and titanium tetraisopropoxide (TTIP) precursors at a [...] Read more.
Cu–TiO2 nanoparticles of a broad range of compositions with 0, 0.002, 0.005, 0.02, 0.05, 0.2, 0.5, 1.0, 2.0, 3.0, 5.0, 7.0 and 10.0 mol% Cu were synthesized via the sol–gel method using copper (II) acetate and titanium tetraisopropoxide (TTIP) precursors at a low hydrolysis ratio of H = 1.25, which favours homogeneous TiO2 nucleation and Cu dispersion in the host matrix at nanoscale. The precipitated materials were dried at 80 °C and calcined at 450, 500, and 550 °C to form crystalline nanopowders, whose photocatalytic activity was evaluated on the decomposition of a representative pollutant, methylene blue (MB), in aqueous solutions under UVA and sunlight illuminations. The compositions with small Cu content of ~0.05 mol% showed the highest activity. A gain of activity over pure titania of 4 times after calcination at 450 °C, 2.5 times at 500 °C and 20% at 550 °C was measured under UVA illumination. Even higher gain of activity observed under sunlight illumination might be due to an extension of action spectrum to the visible range due to intra-gap defect states produced by Cu2+ insertion. The time-resolved microwave conductivity (TRMC) measurements of the photoinduced charges relaxation suggest that both excessive calcination temperature and Cu content decrease the activity due to Cu-defects clustering. Modelling relates the activity to the photoinduced electron-hole pair separation; the optimal Cu content is explained by accessibility of the recombination centre by a conduction band (CB) electron. Accordingly, an increase in calcination temperature resulted in a longer pathlength of CB electron. Full article
(This article belongs to the Special Issue Research on Complex Oxide Nanomaterials)
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