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The Research of Inorganic Nanomaterials
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The Research of Inorganic Nanomaterials

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

Deadline for manuscript submissions: closed (1 October 2021) | Viewed by 9079

Special Issue Editor

Dr. Sotirios Christodoulou

E-Mail Website
Guest Editor
Inorganic Nanocrystals Laboratory, Chemistry Department, University of Cyprus, Nicosia, Cyprus
Interests: nanomaterials; quantum dots; thin films; devices; semiconductors; oxides; ceramics; optoelectronic properties

Special Issue Information

Dear Colleagues,

Research on the fabrication of highly efficient optoelectronic devices has been tremendously expanded in the last decades, mainly thanks to the development of new materials which either substitute or incorporate conventional ones. Nowadays, a plethora of inorganic materials is already being used in devices such as solar cells, transistors, light-emitting diodes (LEDs), photodetectors, and catalysts. In recent years, nanomaterials have attracted considerable attention due to their excellent magnetic and optoelectronic responses, enhanced stability, and high surface-to-volume ratio, which qualify them as promising candidates to replace or complement conventional technologies. Therefore, this Special issue will cover a broad array of topics focused on inorganic nanomaterials and nanocomposites, emphasizing their synthesis, properties, and applications.

  • Inorganic nanomaterials (semiconductors, quantum dots, oxides, ceramics, etc.)
  • Nanocomposites (hybrid nanomaterials, inorganic/organic, etc.)
  • Optoelectronic properties
  • Applications (catalysis, solar cells, lasers, photodetectors, etc.)

I hope you opt to participate in this Special Issue by contributing your original research articles or review papers.

Dr. Sotirios Christodoulou
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. 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

  • Synthesis
  • Optoelectronic properties
  • Devices
  • Thin films
  • Colloids
  • Quantum dots
  • Magnetic properties

Published Papers (4 papers)

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Research

9 pages, 1173 KiB  
Article
The Formation of Cr-Al Spinel under a Reductive Atmosphere
by Oleksandr Shtyka, Waldemar Maniukiewicz, Radoslaw Ciesielski, Adam Kedziora, Viktar Shatsila, Tomasz Sierański and Tomasz Maniecki
Materials 2021, 14(12), 3218; https://doi.org/10.3390/ma14123218 - 10 Jun 2021
Cited by 3 | Viewed by 1720
Abstract
In the present work, for the first time, the possibility of formation of CrAl2O4 was shown from the equimolar mixture of co-precipitated Al2O3 and Cr2O3 oxides under a reductive environment. The crystallographic properties of [...] Read more.
In the present work, for the first time, the possibility of formation of CrAl2O4 was shown from the equimolar mixture of co-precipitated Al2O3 and Cr2O3 oxides under a reductive environment. The crystallographic properties of the formed compound were calculated using the DICVOL procedure. It was determined that it has a cubic crystal structure with space group Fd-3m and a unit cell parameter equal to 8.22(3) Å. The formed CrAl2O4 is not stable under ambient conditions and easily undergoes oxidation to α-Al2O3 and α-Cr2O3. The overall sequence of the phase transformations of co-precipitated oxides leading to the formation of spinel structure is proposed. Full article
(This article belongs to the Special Issue The Research of Inorganic Nanomaterials)
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14 pages, 2906 KiB  
Article
Effects of Concentration and Spin Speed on the Optical and Electrical Properties of Silver Nanowire Transparent Electrodes
by Xiaopeng Li, Jiayue Zhou, Dejun Yan, Yong Peng, Yong Wang, Qi Zhou and Kehong Wang
Materials 2021, 14(9), 2219; https://doi.org/10.3390/ma14092219 - 26 Apr 2021
Cited by 11 | Viewed by 1962
Abstract
In this paper, silver nanowires (AgNWs) with a diameter of 40 nm and a length of 45 μm were dispersed into an ethanol solution to prepare AgNW solutions with concentrations of 1, 2, and 3 mg/mL, respectively. The AgNW solutions were then deposited [...] Read more.
In this paper, silver nanowires (AgNWs) with a diameter of 40 nm and a length of 45 μm were dispersed into an ethanol solution to prepare AgNW solutions with concentrations of 1, 2, and 3 mg/mL, respectively. The AgNW solutions were then deposited on a glass substrate using spin-coating at 1000, 2000, and 3000 rpm for 45 s, respectively, to prepare transparent electrodes. The results showed that the distribution of AgNWs on the substrate increased in density with the increase in the AgNW solution concentration and the decrease in spin speed. The effect of concentration on the distribution of AgNWs was greater than that of the spin speed. The transmittance of each electrode was between 84.19% and 88.12% at 550 nm, the average sheet resistance was between 20.09 and 358.11 Ω/sq, the highest figure of merit (FoM) was 104.42, and the lowest haze value was 1.48%. The electrode prepared at 1000 rpm with a concentration of 2 mg/mL and that prepared at 3000 rpm with a concentration of 3 mg/mL were very similar in terms of the average sheet resistance, transmittance at 550 nm, FoM, and haze value; thus, these two electrodes could be considered equivalent. The haze value of the electrode was positively correlated with the spin speed at low concentration, but that relationship became inverse as the concentration rose. For the AgNWs used in this experiment with an aspect ratio of 1125, the concentration of the AgNW solution should reach at least 2 mg/mL to ensure that the FoM of the electrode is greater than 35. Full article
(This article belongs to the Special Issue The Research of Inorganic Nanomaterials)
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10 pages, 10276 KiB  
Article
CdS Dots, Rods and Platelets—How to Obtain Predefined Shapes in a One-Pot Synthesis of Nanoparticles
by Hanna Woznica, Mateusz Banski and Artur Podhorodecki
Materials 2021, 14(3), 476; https://doi.org/10.3390/ma14030476 - 20 Jan 2021
Cited by 2 | Viewed by 2216
Abstract
In recent years, numerous protocols for nanoplatelet synthesis have been developed. Here, we present a facile, one-pot method for controlling cadmium sulfide (CdS) nanoparticles’ shape that allows for obtaining zero-dimensional, one-dimensional, or two-dimensional structures. The proposed synthesis protocol is a simple heating-up approach [...] Read more.
In recent years, numerous protocols for nanoplatelet synthesis have been developed. Here, we present a facile, one-pot method for controlling cadmium sulfide (CdS) nanoparticles’ shape that allows for obtaining zero-dimensional, one-dimensional, or two-dimensional structures. The proposed synthesis protocol is a simple heating-up approach and does not involve any inconvenient steps such as injection and/or pouring the precursors at elevated temperatures. Because of this, the synthesis protocol is highly repeatable. A gradual increase in the zinc acetate concentration causes the particles’ shape to undergo a transition from isotropic quantum dots through rods to highly anisotropic nanoplatelets. We identified conditions at which synthesized platelets were purely five monolayers thick. All samples acquired during different stages of the reaction were characterized via optical spectroscopy, which allowed for the identification of the presence of high-temperature, magic-size clusters prior to the platelets’ formation. Full article
(This article belongs to the Special Issue The Research of Inorganic Nanomaterials)
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12 pages, 3229 KiB  
Article
High Quality Growth of Cobalt Doped GaN Nanowires with Enhanced Ferromagnetic and Optical Response
by Mudassar Maraj, Ghulam Nabi, Khurram Usman, Engui Wang, Wenwang Wei, Yukun Wang and Wenhong Sun
Materials 2020, 13(16), 3537; https://doi.org/10.3390/ma13163537 - 11 Aug 2020
Cited by 4 | Viewed by 2697
Abstract
Group III–V semiconductors with direct band gaps have become crucial for optoelectronic and microelectronic applications. Exploring these materials for spintronic applications is an important direction for many research groups. In this study, pure and cobalt doped GaN nanowires were grown on the Si [...] Read more.
Group III–V semiconductors with direct band gaps have become crucial for optoelectronic and microelectronic applications. Exploring these materials for spintronic applications is an important direction for many research groups. In this study, pure and cobalt doped GaN nanowires were grown on the Si substrate by the chemical vapor deposition (CVD) method. Sophisticated characterization techniques such as X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive X-Ray Spectroscopy (EDS), Transmission Electron Microscopy (TEM), High-Resolution Transmission Electron Microscopy (HRTEM) and photoluminescence (PL) were used to characterize the structure, morphology, composition and optical properties of the nanowires. The doped nanowires have diameters ranging from 60–200 nm and lengths were found to be in microns. By optimizing the synthesis process, pure, smooth, single crystalline and highly dense nanowires have been grown on the Si substrate which possess better magnetic and optical properties. No any secondary phases were observed even with 8% cobalt doping. The magnetic properties of cobalt doped GaN showed a ferromagnetic response at room temperature. The value of saturation magnetization is found to be increased with increasing doping concentration and magnetic saturation was found to be 792.4 µemu for 8% cobalt doping. It was also depicted that the Co atoms are substituted at Ga sites in the GaN lattice. Furthermore N vacancies are also observed in the Co-doped GaN nanowires which was confirmed by the PL graph exhibiting nitrogen vacancy defects and strain related peaks at 455 nm (blue emission). PL and magnetic properties show their potential applications in spintronics. Full article
(This article belongs to the Special Issue The Research of Inorganic Nanomaterials)
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