Special Issue "Zinc Oxide Nanostructures: Synthesis and Characterization"
A special issue of Materials (ISSN 1996-1944).
Deadline for manuscript submissions: closed (30 November 2017)
Prof. Sotirios Baskoutas
Department of Materials Science, University of Patras, Patra, Greece
Website | E-Mail
Interests: theoretical and computational methods for the study of the electronic and optical properties of semiconducting nanomaterials; synthesis with physical methods; characterization of amorphous and nanocrystalline materials
Among various metal oxide materials, ZnO presents itself as a multifunctional material due to its own properties and functionalities. The properties of ZnO include its wide band gap (3.37 eV), high exciton binding energy (60 meV), biocompatibility, ease of fabrication and so on. Due to its excellent properties, ZnO is widely used for various potential applications such as catalysis, solar cells, ultraviolet (UV) lasers, light emitting diodes, photo-detectors, sensors (chemical, bio- and gas), optical and electrical devices and so on. Among various applications, the use of ZnO nanomaterials as a photocatalyst has particular interest due to their large surface area; wide band gap; ease of fabrication and cost effective synthesis; biocompatible and environmentally benign nature.
More specifically, the nanostructured ZnO semiconductor used as photocatalytic degradation material against environmental pollutants has also been extensively studied, because of its advantages of non-toxic nature, low cost and high reactivity. However, such a photocatalytic degradation only proceeds under UV irradiation because this semiconductor can only absorb UV light. Therefore, ZnO-based materials capable of visible-light photocatalysis are required.
Furthermore, the synthesis of large-scale arrayed 1D ZnO nanostructures, including nanowires, nanorods, nanobelts and whiskers, is an important step for the fabrication of functional nano/microdevices. Recently, because of its high-temperature strength and rigidity, as well as excellent chemical stability, small-diameter ZnO whiskers have received great attention for industrial applications as reinforcement phase in composite materials. ZnO whiskers with high aspect ratio have also been successfully used as a probing tip to develop new precise high-resolution imaging techniques for atomic force microscopy and scanning tunneling microscopy.
Finally, Magnetic ion-doped ZnO quantum dots (QDs) have been targeted as promising candidates for the implementation of novel technologies, such as in spintronic and quantum computation.
Assoc. Prof. Sotirios Baskoutas
Manuscript Submission Information
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 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 1600 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.
- ZnO nanostructures
- electronic properties
- fine structure splitting
- quantum computation
- photon entanglement
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Scale-up of the electrodeposition of ZnO/eosin Y hybrid thin films for the fabrication of flexible dye-sensitized solar cell modules
Authors: Florian Bittner, Jan Ellinger, Jiri Rathousky, Torsten Oekermann, and Michael Wark
Title: Facile synthesis and efficient sensing performance of metal nano particles decorated single crystal zinc oxide nanowire arrays
Authors: Fariborz Taghipour et al.
Title: Defect state of oxygen in nanograined ferromagnetic ZnO
Authors: Boris B. Straumal 1,2,3,4, Svetlana G. Protasova 2,3, Andrei A. Mazilkin 1,2, Elena A. Straumal 5, Eberhard Goering 3, Gisela Schütz 3, Petr B. Straumal 4,6, Brigitte Baretzky 1
Affiliation: 1 Karlsruher Institut für Technologie, Institut für Nanotechnologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
2 Institute of Solid State Physics, Russian Academy of Sciences, Ac. Ossipyan str. 2, 142432 Chernogolovka, Russia
3 Max-Planck-Institut für Intelligente Systeme, Heisenbergstrasse 3, 70569 Stuttgart, Germany
4 National University for Research and Technology “MISiS”, Leninsky prospect 4, 119991 Moscow, Russia
5 Institute of Physiologically Active Compounds, Russian Academy of Sciences, 1 Severnij pr., 142432 Chernogolovka, Russia
6 Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninsky prospect 49, 117991 Moscow, Russia
Abstract: Using the X-ray photoelectron spectroscopy (XPS) we measured in this work the metal–oxygen bonding energy in ZnO bulk single crystal, ZnO nanograined films (ferromagnetic and diamagnetic) as well as in ZnO2 powders. The microstructure of ZnO films has been chatracterized with transmission electron microscopy and their magnetization curves were measured. Diamagnetic ZnO films consist of wurtzite nanograins divided by narrow amorphous layers. In ferromagnetic ZnO films the wurtzite nanograins are surrounded by the broad amorphous regions. The asymmetric O1s peak in ZnO samples is close to ~530 eV and typically can be deconvoluted into three characteristic Gaussian peaks OI, OII and OIII. The OI peak on the lower binding energy side of the O1s spectrum corresponds to oxygen surrounded by Zn atoms in the ZnO hexagonal wurtzite lattice. The OII peak corresponds to oxygen-deficient areas and the OIII peak corresponds to loosely bound oxygen due to surface adsorption. The ferromagnetic properties of ZnO films and nanoparticles are usually explained by the oxygen vacancies witnessed by the presence of strong OII peak. In our work the XPS spectra of bulk ZnO and diamagnetic ZnO films contain strong OI peak and weak OII and OIII peaks. The ferromagnetic ZnO film possesses the additional peak called OIV with the energy about 1.5 eV higher than the OI peak. The energy of OI peak is close to the energy of O1s peak in samples of zinc peroxide ZnO2 having cubic pyrite lattice. We suppose that corresponds to the metal–oxygen bonds in the broad amorphous regions between ZnO nanograins in ferromagnetic films. These Zn–O bonds could be similar to those in zinc peroxide ZnO2.
Keywords: Grain boundaries; ferromagnetism; ZnO; oxygen; XPS