Special Issue "Metal Oxide Nanoparticles and Nanowires: Synthesis, Characterization, and Applications"

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

Deadline for manuscript submissions: closed (31 March 2021).

Special Issue Editors

Prof. Dr. Seung Hwan Ko
E-Mail Website
Guest Editor
Applied Nano and Thermal Science (ANTS) Lab Department of Mechanical Engineering Seoul National University 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea (R.O.K)
Interests: Ag nanowires; Ag nanoparticles; flexible/stretchable electronics; transparent electronics; wearable electronics; Cu nanowires; Cu nanoparticles; laser processing; crack control; soft robot
Special Issues and Collections in MDPI journals
Prof. Dr. Daeho Lee
E-Mail Website
Guest Editor
Department of Mechanical Engineering, Gachon University, Seongnam, Gyeonggi, Korea
Interests: Ni-based electronics; NiO nanoparticles; ZnO nanowires; ZnO nanoparticles; CuO nanoparticles; nanoparticle ink, transparent conductors; flexible sensors; laser processing
Special Issues and Collections in MDPI journals
Dr. Ming-Tsang Lee
E-Mail Website
Guest Editor
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
Interests: solar thermal energy conversion; mutiscale heat and mass transfer; emerging thermofluid technologies for green buildings
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

Metal oxide nanomaterials are versatile materials. As semiconductors, they are utilized as active materials for various kinds of chemical and physical sensors for detecting gases, chemical species, light, temperature, and bio-species, while reduced or doped metal oxides are applied to electrical and thermal conductors. On the other hand, as metal oxides show either n- or p-type behavior, depending on their own defect structure or doping elements, they are used as active layers of field effect transistors, and carrier transport layers in various types of optoelectronic devices. Furthermore, some metal oxides, such as iron oxides, have magnetic characteristics, and some metal oxides are utilized for battery electrodes. Depending on the synthesis routes, metal oxide nanomaterials have various kinds of morphologies (i.e., nanoparticles, nanowires, and nanoparticle-nanowire hybrid structures), are hence utilized for diverse applications. Moreover, electrical and chemical properties are subjected to the different synthesis methods. 

We kindly invite you to submit a high-quality contribution to this Special Issue of Nanomaterials, “Metal Oxide Nanoparticles and Nanowires: Synthesis, Characterization, and Applications’’. Review and original research articles are all welcome.

Prof. Dr. Seung Hwan Ko
Prof. Dr. Daeho Lee
Prof. Dr. Ming-Tsang Lee
Guest Editors

Manuscript Submission Information

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Keywords

  • metal oxide
  • nanoparticle
  • nanowire
  • synthesis
  • characterization

Published Papers (7 papers)

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Research

Open AccessArticle
Evaluation of Ni-Based Flexible Resistance Temperature Detectors Fabricated by Laser Digital Pattering
Nanomaterials 2021, 11(3), 576; https://doi.org/10.3390/nano11030576 - 25 Feb 2021
Viewed by 526
Abstract
Temperature sensors are ubiquitous in every field of engineering application since temperature control is vital in operating, testing and monitoring various equipment systems. Herein, we introduce a facile and rapid laser digital patterning (LDP) process to fabricate low-cost, Ni-based flexible resistance temperature detectors [...] Read more.
Temperature sensors are ubiquitous in every field of engineering application since temperature control is vital in operating, testing and monitoring various equipment systems. Herein, we introduce a facile and rapid laser digital patterning (LDP) process to fabricate low-cost, Ni-based flexible resistance temperature detectors (RTDs). Ni-based RTDs are directly generated on a thin flexible polyimide substrate (thickness: 50 µm) by laser-induced reductive sintering of a solution-processed nonstoichiometric nickel oxide (NiOx) nanoparticle thin film under ambient conditions. The shape of RTDs can be easily adjusted by controlling computer-aided design (CAD) data without using the physical patterning mask while the sensitivity (temperature coefficient of resistance (α) ~ 3.52 × 10−3 °C−1) of the sensors can be maintained regardless of shape and size of the sensor electrodes. The flexible Ni-based RTDs can operate over a wide temperature range up to 200 °C with excellent repeatability. Additionally, the Ni-based RTDs respond quickly to the temperature change and can operate in corrosive environments including water and seawater. Moreover, the Ni-based RTDs show a superior mechanical and electrical stability with a negligible resistance change up to a radius of curvature of 1.75 mm. Finally, a tape-pull test demonstrates the robust adhesion of Ni-based RTDs on the substrate. Full article
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Open AccessArticle
Border Trap Characterizations of Al2O3/ZrO2 and Al2O3/HfO2 Bilayer Films Based on Ambient Post Metal Annealing and Constant Voltage Stress
Nanomaterials 2020, 10(3), 527; https://doi.org/10.3390/nano10030527 - 15 Mar 2020
Cited by 3 | Viewed by 960
Abstract
This study represents a comparison of the border trap behavior and reliability between HfO2 and ZrO2 films on n-In0.53Ga0.47As with an Al2O3 interfacial layer. The effect of different post metal annealing conditions on [...] Read more.
This study represents a comparison of the border trap behavior and reliability between HfO2 and ZrO2 films on n-In0.53Ga0.47As with an Al2O3 interfacial layer. The effect of different post metal annealing conditions on the trap response was analyzed and it was found that the N2:H2 mixed FGA passivates the border trap quite well, whereas N2-based RTA performs better on interface traps. Al2O3/HfO2 showed more degradation in terms of the threshold voltage shift while Al2O3/ZrO2 showed higher leakage current behavior. Moreover, Al2O3/ZrO2 showed a higher permittivity, hysteresis, and breakdown field than Al2O3/HfO2. Full article
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Open AccessArticle
Highly Rectifying Heterojunctions Formed by Annealed ZnO Nanorods on GaN Substrates
Nanomaterials 2020, 10(3), 508; https://doi.org/10.3390/nano10030508 - 11 Mar 2020
Cited by 2 | Viewed by 1138
Abstract
We study the effect of thermal annealing on the electrical properties of the nanoscale p-n heterojunctions based on single n-type ZnO nanorods on p-type GaN substrates. The ZnO nanorods are prepared by chemical bath deposition on both plain GaN [...] Read more.
We study the effect of thermal annealing on the electrical properties of the nanoscale p-n heterojunctions based on single n-type ZnO nanorods on p-type GaN substrates. The ZnO nanorods are prepared by chemical bath deposition on both plain GaN substrates and on the substrates locally patterned by focused ion beam lithography. Electrical properties of single nanorod heterojunctions are measured with a nanoprobe in the vacuum chamber of a scanning electron microscope. The focused ion beam lithography provides a uniform nucleation of ZnO, which results in a uniform growth of ZnO nanorods. The specific configuration of the interface between the ZnO nanorods and GaN substrate created by the focused ion beam suppresses the surface leakage current and improves the current-voltage characteristics. Further improvement of the electrical characteristics is achieved by annealing of the structures in nitrogen, which limits the defect-mediated leakage current and increases the carrier injection efficiency. Full article
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Open AccessArticle
High-Performance Ultraviolet Photodetector Based on a Zinc Oxide [email protected] Carbon Nanotube Heterojunction Hybrid Film
Nanomaterials 2020, 10(2), 395; https://doi.org/10.3390/nano10020395 - 24 Feb 2020
Cited by 2 | Viewed by 1211
Abstract
A hybrid film consisting of zinc oxide nanoparticles (ZnO NPs) and carbon nanotubes (CNTs) is formed on a glass substrate using a simple and swift spin coating process for the use in ultraviolet photodetectors (UV PDs). The incorporation of various types of CNTs [...] Read more.
A hybrid film consisting of zinc oxide nanoparticles (ZnO NPs) and carbon nanotubes (CNTs) is formed on a glass substrate using a simple and swift spin coating process for the use in ultraviolet photodetectors (UV PDs). The incorporation of various types of CNTs into ZnO NPs ([email protected]) enhances the performance of UV PDs with respect to sensitivity, photoresponse, and long-term operation stability when compared with pristine ZnO NP films. In particular, the introduction of single-walled CNTs (SWNTs) exhibits a superior performance when compared with the multiwalled CNTs (MWNTs) because SWNTs can not only facilitate the stability of free electrons generated by the O2 desorption on ZnO under UV irradiation owing to the built-in potential between ZnO and SWNT heterojunctions, but also allow facile and efficient transport pathways for electrons through SWNTs with high aspect ratio and low defect density. Furthermore, among the various SWNTs (arc-discharged (A-SWNT), Hipco (H-SWNT), and CoMoCat (C-SWNT) SWNTs), we demonstrate the [email protected] hybrid film exhibits the best performance because of higher conductivity and aspect ratio in A-SWNTs when compared with those of other types of SWNTs. At the optimized conditions for the [email protected] film (ratio of A-SWNTs and ZnO NPs and electrode distance), [email protected] displays a sensitivity of 4.9 × 103 % with an on/off current ratio of ~104 at the bias of 2 V under the UV wavelength of 365 nm (0.47 mW/cm2). In addition, the stability in long-term operation and photoresponse time are significantly improved by the introduction of A-SWNTs into the ZnO NP film when compared with the bare ZnO NPs film. Full article
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Open AccessArticle
Flexible Free-Standing CuxO/Ag2O (x = 1, 2) Nanowires Integrated with Nanoporous Cu-Ag Network Composite for Glucose Sensing
Nanomaterials 2020, 10(2), 357; https://doi.org/10.3390/nano10020357 - 19 Feb 2020
Cited by 2 | Viewed by 766
Abstract
To improve glucose electrocatalytic performance, one efficient manner is to develop a novel Cu-Ag bimetallic composite with fertile porosity and unique architecture. Herein, the self-supported electrode with CuxO/Ag2O (x = 1, 2) nanowires grown in-situ on a nanoporous [...] Read more.
To improve glucose electrocatalytic performance, one efficient manner is to develop a novel Cu-Ag bimetallic composite with fertile porosity and unique architecture. Herein, the self-supported electrode with CuxO/Ag2O (x = 1, 2) nanowires grown in-situ on a nanoporous Cu-Ag network (CuxO/Ag2[email protected]) has been successfully designed by a facile two-step approach. The integrated hierarchical porous structure, the tip-converged CuxO/Ag2O nanowires combined with the interconnected porous conductive substrate, are favorable to provide more reactive sites and improve ions or electrons transportation. Compared with monometallic Cu2O nanowires integrated with nanoporous Cu matrix (Cu2[email protected]), the bimetallic CuxO/Ag2[email protected] composites exhibit the enhanced electrocatalytic performance for glucose. Moreover, the higher sensitivity of ~1.49 mA mM−1 cm−2 in conjunction with a wider linear range of 17 mM for the CuxO/Ag2[email protected] electrode anodized for 10 min are attributed to the synergistic effect of porous structure and bimetallic CuxO/Ag2O nanowires. Particularly, the integrated CuxO/Ag2[email protected] composites possess good flexibility, which has been reported for the first time. Accordingly, the CuxO/Ag2[email protected] with excellent glucose electrocatalytic performance and good flexibility is promising to further develop as a candidate electrode material of glucose sensors. Full article
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Open AccessArticle
Green Synthesized Copper Oxide Nanoparticles Ameliorate Defence and Antioxidant Enzymes in Lens culinaris
Nanomaterials 2020, 10(2), 312; https://doi.org/10.3390/nano10020312 - 12 Feb 2020
Cited by 19 | Viewed by 1890
Abstract
Biosynthesis of copper oxide nanoparticles (CuONPs) in a cost-effective and eco-friendly way has gained its importance. CuONPs has been prepared from copper sulfate by using Adiantum lunulatum whole plant extract. CuONPs have been characterized by X-ray diffraction, Fourier transform infrared spectroscopic, transmission electron [...] Read more.
Biosynthesis of copper oxide nanoparticles (CuONPs) in a cost-effective and eco-friendly way has gained its importance. CuONPs has been prepared from copper sulfate by using Adiantum lunulatum whole plant extract. CuONPs have been characterized by X-ray diffraction, Fourier transform infrared spectroscopic, transmission electron microscope, etc. Mono-disperse, spherical, pure, and highly stable CuONPs have formed with an average diameter of 6.5 ± 1.5 nm. Biosynthesized CuONPs at different concentrations were applied to seeds of Lens culinaris. Physiological characteristics were investigated in the germinated seeds. Roots obtained from the seeds treated with 0.025 mgmL−1 concentration of CuONPs showed highest activity of different defence enzymes and total phenolics. However, at higher concentration it becomes close to control. It showed gradual increase of antioxidative enzymes, in accordance with the increasing dose of CuONPs. Likewise, lipid peroxidation and proline content gradually increased with the increasing concentration. Reactive oxygen species and nitric oxide generation was also altered due to CuONPs treatment indicating stress signal transduction. Finally, this study provides a new approach of the production of valuable CuONPs, is a unique, economical, and handy tool for large scale saleable production which can also be used as a potent plant defence booster instead of other commercial uses. Full article
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Open AccessArticle
A Convenient Colorimetric Bacteria Detection Method Utilizing Chitosan-Coated Magnetic Nanoparticles
Nanomaterials 2020, 10(1), 92; https://doi.org/10.3390/nano10010092 - 02 Jan 2020
Cited by 5 | Viewed by 1312
Abstract
An effective novel strategy to detect bacteria is promising because it may improve human health by allowing early diagnosis and timely treatment of bacterial infections. Here, we report a simple, reliable, and economical colorimetric assay using the peroxidase-like activity of chitosan-coated iron oxide [...] Read more.
An effective novel strategy to detect bacteria is promising because it may improve human health by allowing early diagnosis and timely treatment of bacterial infections. Here, we report a simple, reliable, and economical colorimetric assay using the peroxidase-like activity of chitosan-coated iron oxide magnetic nanoparticles (CS-MNPs). When CS-MNPs are incubated with a sample containing bacterial cells such as the gram-negative Escherichia coli or the gram-positive Staphylococcus aureus, the negatively-charged bacterial membrane interacts with positively-charged chitosan on the surface of CS-MNPs, thus resulting in significant reduction of their peroxidase-like activity presumably by a hindrance in the accessibility of the negatively charged substrate, 2-2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) to the positively-charged CS-MNPs. This simple colorimetric strategy allowed the rapid detection of bacterial cells down to 104 CFU mL−1 by the naked eye and 102 CFU mL−1 by spectrophotometry within 10 min. Based on the results, we anticipate that the CS-MNPs-based assay has great potential for the on-site diagnosis of bacterial infections in facility-limited or point-of-care testing (POCT) environments. Full article
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