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High efficient catalytic degradation of tetracycline and ibuprofen using visible light driven novel Cu/Bi2Ti2O7/rGO nanocomposite: Kinetics, intermediates and mechanism
摘要： The photoexcited charge carriers trapping was an effective way to generate a large number of active species like O2?? and ?OH radicals to oxidize pharmaceutical molecules. In ternary Cu/Bi2Ti2O7/rGO composite Cu nanoparticles and rGO sheets act as charge carrier trappers and the suppression of e--h+ pair recombination was confirmed by Photoluminescence analysis. The Cu/Bi2Ti2O7/rGO composite exhibited higher photocatalytic degradation efficiency for degradation of ibuprofen and tetracycline molecules under visible light irradiation within 90 min. Therefore, this research designates a promising strategy for higher photoexcited charge carrier trapping photocatalyst design for efficient degradation of pharmaceutical molecules.
关键词： Nanocomposite,Visible light-driven,Hydrothermal,Pharmaceutical contamination.,Charge carrier trappers
更新于2025-09-23 15:23:52
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Novel scintillating nanocomposite for X-ray induced photodynamic therapy
摘要： We synthesize a novel prospective nanocomposite material for X-ray induced photodynamic therapy. ZnO:Ga core is coated by the SiO2 shell facilitating a functionalization by a photosensitizer, protoporphyrin PpIX layer. By steady-state and time resolved spectroscopy we confirm the presence of energy transfer between the core and the photosensitizer, an essential requirement to induce a cytotoxic effect. Using the commercial chemical probe we also demonstrate the ability of prepared ZnO:Ga@SiO2-PpIX nanocomposite to generate singlet oxygen. Presented results show that this nanocomposite can be considered as a good candidate for potential application in X-ray induced photodynamic therapy.
关键词： Scintillator,Nanocomposite,Zinc oxide,Photodynamic therapy,Singlet oxygen
更新于2025-09-23 15:23:52
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Surface Plasmon Resonance Based Highly Selective Fiber Optic Dopamine Sensor Fabricated Using Molecular Imprinted GNP/SnO <sub/>2</sub> Nanocomposite
摘要： Fabrication and characterization of a highly selective fiber optic surface plasmon resonance-based dopamine sensor using molecular imprinted graphene nanoplatelets/tin oxide (SnO2) nanocomposite have been reported. The synthesis of sensing layer has been carried out using a series of optimizations and morphological studies. The effectiveness of the sensing layer over other possible probe designs has been proved by performing control experiments for a dopamine concentration range covering the suggested level of dopamine for human being. The limit of detection (LOD) of the sensor evaluated is 0.031 μM, which is lower than the LOD values of various dopamine sensors fabricated using different methods. The specificity of the sensor for dopamine has been confirmed by performing experiments using various interferands while the stability and reusability of the sensor probe have been checked by performing experiments repeatedly for a long period of time. Apart from high sensitivity, low LOD, and fast response, the sensor can be used for remote sensing and online monitoring of dopamine.
关键词： surface plasmon resonance,SnO2 nanoparticles,optical fiber sensor,GNP/SnO2 nanocomposite,graphene,Dopamine,molecular imprinting
更新于2025-09-23 15:23:52
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Preparation and properties of duplex NI-P-TIO <sub/>2</sub> /NI nanocomposite coatings
摘要： Duplex Ni-P-TiO2/Ni coatings were deposited on the brass substrate by using two baths. Ni-P-TiO2 nanocomposite coatings were electroplated as the outer layer on the Ni-plated brass substrate by adding transparent TiO2 sol (0–50 mL/L) into the Ni-P plating solution. The microstructure, mechanical property and corrosion resistance of the duplex Ni-P-TiO2/Ni nanocomposite coatings were systemically investigated. The results show that the interface of duplex coating was uniform and the adhesion between two layers was extremely good. The microhardness of duplex Ni-P-12.5 mL/L TiO2 /Ni coating was ～616 HV50 compared to ～539 HV50 of Ni-P /Ni coating and ～307 HV50 of single Ni coating. Meanwhile, the wear resistance and the corrosion resistance of the duplex nanocomposite coating have also been improved remarkably compared with single Ni coating. However, adding excessive TiO2 sol (more than 12.5 mL/L) caused the agglomeration of TiO2 nanoparticles and led to a porous structure in the outer layer, resulting in the deterioration of coating properties.
关键词： Nanocomposite coatings,mechanical property,corrosion resistance.
更新于2025-09-23 15:23:52
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Facile synthesis of silver-polypyrrole nanocomposites: Use of ionic liquid as solvent and template
摘要： In this study we show a facile method to synthesize nanocomposites of PPY and silver from the direct oxidation of pyrrole by silver cations from silver bis(trifluoromethanesulfonyl)imide (AgTf2N), using 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMImTf2N) as solvent and template to the hybrid material formation. Some synthesis parameters, such as initial concentration of the oxidant agent (C) and oxidant-to-monomer molar ratio (K) were varied in order to evaluate their influence on the final product. The black powders obtained, according to the characterization results, contain doped polypyrrole and silver nanoparticles amounts ranged from 26 to 36 wt%, depending on the C and K parameters utilized in the syntheses. The measured electrical conductivity values of the samples were in the order of 10-2 S cm-1, which classify the hybrid materials as semiconductor. By adding the HTf2N acid to the synthesis, a sample with more elevated electrical conductivity (0.12 S cm-1) was obtained, caused by the higher protonation degree of the oxidized units in the polymer.
关键词： Polypyrrole,Nanocomposite,Ionic liquids,Silver nanoparticles
更新于2025-09-23 15:23:52
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Electrical Permittivity and Conductivity of a Graphene Nanoplatelet Contact in the Microwave Range
摘要： This paper investigates the electrical properties in the microwave range of a contact made by graphene nanoplatelets. The final goal is that of estimating the range of values for the equivalent electrical complex permittivity of a contact obtained by integrating low-cost graphene in the form of nanoplatelets (GNPs) into a high-frequency electrical circuit. To this end, a microstrip-like circuit is designed and realized, where the graphene nanoplatelets are self-assembled into a gap between two copper electrodes. An experimental characterization is carried out, both to study the structural properties of the nanomaterials and of the realized devices, and to measure the electromagnetic scattering parameters in the microwave range by means of a microstrip technique. A full-wave electromagnetic model is also derived and used to investigate the relationship between the measured quantities and the physical and geometrical parameters. The combined use of the experimental and simulation results allows for retrieving the values of the equivalent complex permittivity. The equivalent electrical conductivity values are found to be well below the values expected for isolated graphene nanoplatelets. The real part of the electrical relative permittivity attains values comparable to those obtained with GNP nanocomposites.
关键词： nanocomposite,permittivity,scattering parameters,graphene nanoplatelets
更新于2025-09-23 15:23:52
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Future Scope of Silicone Polymer based Functionalized Nanocomposites for Device Packaging: A Mini Review
摘要： Organic electronic devices, such as conducting polymer and/or perovskite based solar cells are highly promising and emerging, but they are highly unstable in the presence of moisture and oxygen. It is important to protect these devices from these deterrent gases by using a suitable encapsulant and to improve the lifetime of these promising devices. “Silicone polymer” impregnated with suitable functionalized nano fillers/moisture or oxygen scavengers can be potentially used for sensitive organic device encapsulation applications, where a combined property of flexibility, thermal stability, transparency, and low moisture permeation is critical. Suitable fillers can also enhance the thermo-mechanical properties of silicone polymers, which is also important for hermitic sealing applications. Silicone polymer have a wide range of applications in electronic, mechanical, and biological industries, due to their flexibility over a broad temperature window, resiliency, transparency, superior thermal stability, resistant to aging and degradation from sunlight. This polymer also coats a surface conformally, having moisture resistance property and inertness. In this mini-review, functionalized composites based on silicone polymers, which have been developed for the potential organic device encapsulation application, has been discussed. In addition to that, future direction towards the fabrication of new functionalized nanocomposites, based on silicone polymers is also discussed briefly.
关键词： Nanocomposite,Curing,Organic devices,Functionalization,Silicone polymer
更新于2025-09-23 15:23:52
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Ni-P-TiO <sub/>2</sub> nanocomposite coatings with uniformly dispersed Ni <sub/>3</sub> Ti intermetallics: effects of TiO <sub/>2</sub> nanoparticles concentration
摘要： Ni-P-TiO2 nanocomposite coatings were electrodeposited on copper substrates and influence of TiO2 nanoparticles concentration on the phase structure, morphology, chemical composition, microhardness, and corrosion behaviour of the coatings was investigated. Results demonstrate that Ni3Ti intermetallics form and grow during the electrodeposition of the coatings. This study is the first to report the formation of the intermetallics in the case of electrodeposited Ni-P alloy matrix composite coatings. Moreover, the formation mechanism of the intermetallics is discussed in detail. The formed intermetallics dispersed uniformly throughout the microstructure of the nanocomposite coatings, thereby playing a critical role in improving the mechanical and corrosion-related properties of the coatings. Ni-P-10 g·L?1 TiO2 nanocomposite coating possessing the highest amount of Ni3Ti intermetallic associated with the lowest P content, thereby showing the superior microhardness and corrosion resistance. All in all, the volume fraction of Ni3Ti intermetallics is the dominant factor altering the various properties of the coatings.
关键词： corrosion behaviour,DC electrodeposition,Ni-P-TiO2 nanocomposite coatings,Ni3Ti intermetallic,mechanical properties
更新于2025-09-23 15:23:52
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A novel approach to synthesize nanostructured WO3 and graphene/WO3 nanocomposites: Structural and morphological investigations
摘要： Nanostructured metal oxide based nanocomposites have attracted considerable attention due to their promising and remarkable properties. In the present study, a novel method is developed for the preparation of Graphene oxide (GO)/tungsten oxide WO3 nanocomposites by using tungsten carbide (WC) and graphite as precursors. (GO)/WO3 nanocomposites are prepared via in situ and ex situ chemical approaches followed by subsequent thermal treatment at 500 °C. The obtained samples were characterized by di?erent techniques to con?rm the transformation of WC to WO3 nanostructures and the formation of their nanocomposites with carbon nanostructures. X-ray di?raction (XRD) analysis indicates that the WO3 nanoparticles were ?ne crystallized with a monoclinic phase even after interaction with GO for the ex situ prepared GO/WO3 and di?erent phases of WO3 appeared during their growth in situ in the presence of graphite. Scanning electron microscopy (SEM) images reveal the rods-like shape of WO3 nanostructures with uniform distribution onto the RGO nanosheets. Fourier transform infrared (FTIR) spectroscopy con?rms the interaction and charge transfer between the components. The experimental results reveal the e?ciency of the proposed approach that opens up a promising route to prepare G/WO3 nanocomposites for many applications.
关键词： Graphene,Hybrid nanocomposite,Tungsten oxide
更新于2025-09-23 15:23:52
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Resistive Switching and Nonvolatile Memory in TiO2/CuPc Nanocomposite Devices
摘要： An organic–inorganic nanocomposite has been prepared as a hybrid memory element, and a bistable data storage device has been fabricated. The composite device, consisting of a spin casted thin film of sol–gel derived titanium dioxide (TiO2) nanoparticles followed by a vacuum evaporated thin film of copper phthalocyanine (CuPc), exhibits conductance switching and nonvolatile memory phenomenon. While the single layer device with TiO2 nanoparticles showed unipolar switching characteristics, the composite device exhibited bipolar switching with highly improved performance. The erase/reset voltage for the single layer TiO2 device is 4.5 V, which reduces to |3| V for the composite device. The on/off current ratio of the composite device measured to be > 104 , which is orders of magnitude higher in comparison to that in the single layer devices. The charge transport mechanism of the devices revealed that trap-related space charge limited conduction mechanism might be responsible for the composite device while it indicates possible formation of filamentary path in the single layer TiO2 based devices leading to ohmic-like conduction. The ability of the composite device to write, erase, read, and refresh the electrical states fulfills the functionality of a dynamic random access memory having potential for next generation low cost memory applications.
关键词： Memory,bistability,phthalocyanine,nanocomposite,random access memory
更新于2025-09-23 15:22:29