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Influence of Sputtered ZnO and Al:ZnO Top Layers on Magneto-Optic Responses of Yttrium Iron Garnet Films
摘要： Zinc oxide (ZnO) is a promising material for combining with magneto-optic (MO) materials because it can propagate stable exciton-polaritons, with velocities considerably lower than that of photons in a vacuum. This study investigated the in?uence of sputtered ZnO and Al:ZnO top layers on MO responses of a bismuth-substituted yttrium iron garnet (Bi:YIG) ?lm. The ZnO top layer modulated the Faraday rotation and magnetic circular dichroism (MCD) of the Bi:YIG around the exciton resonance wavelength of ZnO at 369 nm. Furthermore, Al-substituted ZnO, which is a conductive ZnO, also changed the MO effects around the exciton resonance wavelength. These results imply that the exciton-polaritons in ZnO affect the MO interaction, because of their considerably low group velocity. The results suggest potential for controlling the MO response via excitons.
关键词： exciton,magneto-optical effect,magnetic garnet,zinc oxide,polariton
更新于2025-09-04 15:30:14
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Zinc Oxide Nanorods Wrapped with Ion-Imprinted Polypyrrole Polymer for Picomolar Selective and Electrochemical Detection of Mercury II Ions
摘要： This study concerns the design of an ion-imprinted polymer (IIP) for the selective detection of mercury II ions. Compared to other electrochemical studies, the originality of this work lies to the fact that the IIP was electropolymerized on ZnO nanorods, which were themselves grown on gold/diazonium modified substrates. This strategy of diazonium salt and ZnO nanorods permits to increase considerably the specific surface and thus to improve the sensor’s performances. The limit of detection (LOD) of the designed sensor was of order of 1 pM, the lowest value ever reported in literature.
关键词： mercury,electrochemical detection,ionic imprinted polymer,zinc oxide nanorods
更新于2025-09-04 15:30:14
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Design of zinc oxide-based surface acoustic wave sensors using a graphene electrode
摘要： Continuous monitoring of skin moisture by using a wearable moisture sensor consisting of the materials that have no risk of skin sensitization, such as zinc oxide (ZnO), is essential to optimize the healing process in wound care. Here we tackled the investigation of the optimum electrode for ZnO-based surface acoustic wave (SAW) sensors to achieve this goal. Al and Au electrodes commonly used were compared with a graphene electrode by simulation in terms of the frequency characteristics of the SAW device. Graphene and Al showed the same tendency in frequency characteristics as the 0 thickness electrode (ideal electrode). Since graphene is suitable for flexible devices due to its stretchability and for the long-term stability due to its chemical innerness, it was concluded that graphene is more suitable than the conventional Al and Au electrodes for flexible SAW sensor devices.
关键词： flexible devices,surface acoustic wave sensors,wearable moisture sensor,zinc oxide,graphene electrode
更新于2025-09-04 15:30:14
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[IEEE 2018 International Semiconductor Conference (CAS) - Sinaia, Romania (2018.10.10-2018.10.12)] 2018 International Semiconductor Conference (CAS) - Comparative Study of Sm and La Doped ZnO Properties
摘要： Samarium and Lanthanum doped nanostructured ZnO thin films were grown onto glass substrates by spray deposition method. Influences of different concentrations (0% to 1%) of Sm and La on the ZnO structural and optical properties were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), atomic force microscopy (AFM), Raman spectroscopy and by UV-VIS spectroscopy. X-ray diffraction studies revealed that the ZnO films have zincite crystalline structure and show a preferential growth orientation along (101) crystallographic orientation. Doping with Sm and La leads to changes of thin films crystallinity as well as their transparency in VIS region of electromagnetic spectrum. Increasing dopant concentration leads to slightly increased transparency.
关键词： samarium,zinc oxide,optical properties,Lanthan,dopant
更新于2025-09-04 15:30:14
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Synthesis and Characterization Performance of Amphiphilic ZnO, a Novel Photocatalyst Suitable for Degradation of Contaminants in Oil–Water Two Phase System
摘要： Amphiphilic zinc oxide (ZnO) was successfully prepared by modifing neat ZnO with silane coupling reagent KH-570. The modified ZnO and neat ZnO were characterized by measurement of the lipophilic degree value; Fourier transformed infrared spectroscopy (FT-IR), ultraviolet-visible (UV–Vis), X-ray diffraction (XRD). The results showed that KH-570 was successfully coated on surface of the neat ZnO, as a result, the modified ZnO was amphiphilic. Compared with neat ZnO, amphiphilic ZnO has a better compatibility with the organic solvent and its photocatalysis ability for oil degradation was enhanced by 28%. The improved oil degradation performance of amphiphilic ZnO can be explained by its hydrophobic property, which is benefit for absorbing oil in water.
关键词： photocatalytic,oil,amphiphilic,zinc oxide
更新于2025-09-04 15:30:14
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Effect of a-Si thin film on the performance of a-Si/ZnO-stacked piezoelectric energy harvesters
摘要： In this letter, we present the fabrication and characterization of a zinc oxide (ZnO)-based nanogenerator for piezoelectric micro-energy harvesting by combining thin films of amorphous silicon (a-Si) and ZnO. We utilized the a-Si thin film as an interlayer to assemble several a-Si/ZnO-stacked piezoelectric nanogenerators (SZPNGs) on indium tin oxide (ITO)-coated polyethylene naphthalate substrates. We investigated the influence of the a-Si layer thickness on the output voltages of the SZPNGs and demonstrated the existence of an optimal a-Si thickness for maximizing the output voltage. Overall, the SZPNGs generated higher output voltages than a conventional ZnO-based piezoelectric nanogenerator (ZPNG) lacking an a-Si interlayer, indicating enhanced performance. In particular, the SZPNG based on the optimal a-Si thickness exhibited a sixfold higher output voltage compared with the conventional ZPNG. This improved performance was ascribed to a combination of the Schottky barrier at the ITO/a-Si interface, preventing the screening effect and the relatively high dielectric constant (er≈13) of a-Si, minimizing the loss of the piezoelectric potential induced in the ZnO layer. The results herein are expected to assist the development of even more advanced ZnO-based piezoelectric nanogenerators in the future.
关键词： piezoelectric energy harvesting,zinc oxide,amorphous silicon,Schottky barrier,nanogenerator
更新于2025-09-04 15:30:14
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Temperature Effect on Optical and Electrical Properties of ZnO Films
摘要： Zinc oxide thin films were deposited on a glass substrate by Radio frequency magnetron sputtering. The effect of substrate temperature on the microstructure, optical and electrical properties was investigated. Crystal structure and surface morphology of the films were examined by X-ray diffraction and atomic force microscopy. XRD patterns and AFM images show that the crystallinity and grain size are increasing with the increase of substrate temperature. Electrical properties of the films were evaluated by Hall effect measurements. Experimental results indicate a decrease of film resistivity with the increase of substrate temperature. Zinc oxide films exhibit high transmittance of 84 % in the visible wavelength range 400-800 nm and is independent on the substrate temperature. Present work shows that the enhancement of the ZnO film performance with high transparency and low resistivity can be achieved by increasing the substrate temperature.
关键词： Resistivity,Zinc oxide film,Transmittance,Substrate temperature
更新于2025-09-04 15:30:14
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Multifunctional Flax Fibres Based on the Combined Effect of Silver and Zinc Oxide (Ag/ZnO) Nanostructures
摘要： Cellulosic fibre-based smart materials exhibiting multiple capabilities are getting tremendous attention due to their wide application areas. In this work, multifunctional flax fabrics with piezoresistive response were developed through the combined functionalization with silver (Ag) and zinc oxide (ZnO) nanoparticles (NPs). Biodegradable polyethylene glycol (PEG) was used to produce AgNPs, whereas ZnONPs were synthetized via a simple and low-cost method. Flax fabrics with and without NPs were characterized by Ground State Diffuse Reflectance (GSDR), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive Spectroscopy (EDS), X-ray Diffraction (XRD), Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR), and Thermogravimetric analysis (TGA). After creating a conductive surface by flax functionalization with AgNPs, ZnONPs were synthetized onto these fabrics. The developed fibrous systems exhibited piezoresistive response and the sensor sensitivity increased with the use of higher ZnO precursor concentrations (0.4 M). Functionalized fabrics exhibited excellent antibacterial activity against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria, higher hydrophobicity (WCA changed from 00 to >1000), UV radiation resistance, and wash durability. Overall, this work provides new insights regarding the bifunctionalization of flax fabrics with Ag/ZnO nanostructures and brings new findings about the combined effect of both NPs for the development of piezoresistive textile sensors with multifunctional properties.
关键词： piezoresistive response,smart and multifunctional materials,cellulosic fibres,silver and zinc oxide nanoparticles,antibacterial effect,hydrophobicity
更新于2025-09-04 15:30:14
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Ferromagnetic Behavior and Electronic Characterization of ZnO Nanoparticles
摘要： In this work, Al-doped ZnO nanoparticles encapsulated with amorphous SiO2 were prepared by the wet chemical method. The obtained precursor was annealed and the nanoparticle sizes were controlled by adjusting the annealing temperature. These nanomaterials showed ferromagnetic behavior, even though the ZnO bulk crystal was diamagnetic. The results of electrical conductivity and XANES suggested that ferromagnetism of the Al-doped nanoparticles was results of carrier transport and oxygen vacancies. The Al-doped ZnO nanoparticles are extremely interesting from the perspective of solid state physics. [DOI: 10.1380/ejssnt.2018.406]
关键词： Nano-particles, quantum dots, and supra-molecules,Magnetic, structural, and other properties of nanostructures,Zinc oxide,Luminescence,Near edge extended X-ray absorption fine structure (NEXAFS)
更新于2025-09-04 15:30:14
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Preparation of ZnO Nanoparticles Under Ultrasonic Irradiation and Photocatalytic Performance of ZnO Nanoparticles Multilayer Films
摘要： Zinc oxide nanoparticles were synthesized by the reaction of an aqueous-alcoholic solution containing zinc nitrate hexahydrate and sodium hydroxide under ultrasonic irradiation at room temperature. The crystallinity, morphology and optical property of ZnO nanoparticles were examined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and UV-visible spectrophotometer. Zinc oxide nanoparticles multilayer films were prepared dipping glass slide, which had been cleaned with a piranha solution, into a ZnO solution by ultrasonic irradiation. The ZnO nanoparticles multilayer films were evaluated as a photocatalyst in the photocatalytic degradation of organic dyes, such as methylene blue, methyl orange and rhodamine B, under ultraviolet light at 254 nm.
关键词： Multilayer films,Photocatalytic activity,Zinc oxide nanoparticles,Organic dyes,UV-visible spectrophotometer
更新于2025-09-04 15:30:14