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Fabrication of Luminescent Antireflective Coatings with CaMoO4:Eu3+/Ag Composite Structure
摘要： Highly transparent and luminescent CaMoO4:Eu3+/Ag composite films were fabricated on glass substrates as multifunctional antireflective (AR) coatings. The films were deposited through a combination of a sol–gel dip-coating technique and a hot water treatment. With the addition of an aluminum source in coating solutions, the sol–gel-derived films underwent a remarkable microstructural change during the hot water treatment due to the reaction between an amorphous alumina phase and water. This change brought both an antireflective effect (suppression of Fresnel reflection) and luminescence enhancement (suppression of total internal reflection) to the films. The introduction of Ag nanoparticles into the films further increased luminescence intensity without losing the antireflective effect.
关键词： calcium molybdate,silver nanoparticles,antireflective coatings,europium,nanocomposite,sol–gel method,photoluminescence
更新于2025-09-11 14:12:44
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Synthesis and characterization of Polymer/Silica/QDs fluorescent nanocomposites with potential application as printing toner
摘要： In this work cadmium telluride quantum dots (CdTeQDs) were prepared via one-pot synthesis microwave assisted. Afterwards, CdTeQDs/silica (SiO2)/nigrosine (nigro)/poly (styrene co-methyl methacrylate) (PSCMM) fluorescent nanocomposite (CSNP) powders were prepared via ultrasonic treatment and post drying at 60 ℃. The samples were characterized by UV-vis absorbance, X-Ray diffraction (XRD) and transmission electron microscopy (TEM). Finally, successful printing tests were performed on security paper at 130 ℃. These results show the potential of this nanocomposite to be used as security toner.
关键词： Cadmium Telluride,Security Toner,Nanocomposite,Quantum Dots
更新于2025-09-10 09:29:36
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Au/Ag NPS Decorated PANI For Electrochemical and Biomedical Applications
摘要： Polyaniline (PANI) has number of electronic structure and it depends on the doping. PANI composites containing Fe3O4NPs are regularly studied as the PANI having electrical and magnetic features. Herein, PANI was prepared from aniline and HCl by means of solution mixing using ammonium persulphate as oxidizing agent and catalyst. Composites of polyaniline with calcium carbonate and Au/Ag NPs were prepared. Nanocomposites of PANI were characterized using FTIR, SEM, EDX, electrical conductivity measurement techniques. The incorporation of CaCO3 and Au/Ag NPs in polyaniline matrix was confirmed by SEM, FT-IR and EDX results. CaCO3 act as binder and provide strength to the composite which can be clearly understood by SEM microgram. Electrochemical study of composite has been done which showed that on decorating PANI with gold/silver NPs, the conducting properties increases. We successfully tested the antimicrobial activity of nanocomposite via paper disk diffusion method against Escherichia coli and Staphylococcus aureus.
关键词： Antibacterial,Nanocomposite,Conducting polymer,Conductivity
更新于2025-09-10 09:29:36
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Synergistically Catalytic Activities of BiFeO3/TiO2 Core-Shell Nanocomposites for Degradation of Organic Dye Molecule through Piezophototronic Effect
摘要： The BiFeO3/TiO2 core-shell nanocomposites with the R3C space group is demonstrated to exhibit the superior synergistically catalyst activities, which is a combination of the piezo- and photo-catalytic activities (referred to as the piezophototronic effect). With the application of an ultrasonification and light irradiation, the degradation activity for the decomposition of the dye molecules by the piezoelectric polarization of the BiFeO3/TiO2 core-shell nanocomposites (referred to as the hybrid catalyst, BiFeO3/TiO2 NCs-P) is 432% higher than that of the un-poling BiFeO3/TiO2 nanocomposites (BiFeO3/TiO2 NCs). In responding to the excitation of the mechanical force (ultrasonic vibration), the results demonstrate that the BiFeO3 nanoparticles can effectively reduce the recombination rate of the carriers by the built-in electric field. Subsequently, the redox reaction has taken place on the surface of the hybrid catalyst in the solution to generate the powerful oxidizing radicals and further dissociate the organic dyes. The reaction k constant of the piezophototronic effect is 566% and 388% higher than that of the sole piezocatalytic and the photocatalytic process, respectively. After four consecutive cycling degradation tests, the hybrid catalyst still reaches ~ 85% of the degradation activity by the piezophototronic effect. Based on the fluorescence luminescence (FL) analysis, the signals associated to the hydroxyl radicals elevate with the increase of the catalysts’ concentration and the ultrasonic vibration time. This work reveals that the hybrid catalysts contains the ferroelectric material, which provides a new catalyst design strategy in the industrial application.
关键词： piezocatalysis,piezophototronic,TiO2,BiFeO3,photocatalysis,nanocomposite
更新于2025-09-10 09:29:36
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Synergistic Photocatalytic-Photothermal Contribution to Antibacterial Activity in BiOI-Graphene Oxide Nanocomposites
摘要： The threat of environmental microbial contamination to the health of human beings has arisen particular attention. In order to explore the synergistic effect of photocatalytic and photothermal process to the antibacterial property, a stably combined BiOI-graphene oxide (GO) nanocomposite was constructed and prepared through a facile solvothermal method. BiOI crystals were uniformly distributed on the GO nanosheets by the formation of Bi-C bond. Based on the various characterizations, the great surface area, the high light harvesting with extension into NIR region and the efficient transfer of photo-induced electrons by the conductivity of GO was demonstrated, which was beneficial for the photocatalytic antibacterial activity. More importantly, the photothermal effect of GO raise the temperature of BiOI-GO composite with high photothermal conversion efficiency and induced the photo-generated electrons from BiOI crystals to obtain more energy and higher carrier mobility. Conversely, the temperature elevation of BiOI-GO composite improved its capability of light absorption and separation of photo-induced charges. As a result, BiOI-GO composite presented the synergistic photocatalytic-photothermal effect to the improvement of antibacterial property for Acinetobacter baumannii with the higher efficiency of TOC removal and leakage of K+ ions, in comparison to the individual photocatalytic process. Thus, the synergistic photocatalytic-photothermal contribution of BiOI-GO composite will provide a significance for the potential application of environmental disinfection in the future.
关键词： Antimicrobial activity,Synergistic photocatalytic-photothermal contribution,BiOI-graphene oxide,Nanocomposite
更新于2025-09-10 09:29:36
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High performance acetone sensor based on γ-Fe<sub>2</sub>O<sub>3</sub>/Al-ZnO nanocomposites
摘要： Ternary nanocomposites made of γ-iron oxide and aluminium-doped zinc oxide (γ-Fe2O3/Al-ZnO NCs), with different metal oxides ratio (0-100%) were prepared through a solvothermal sol-gel process. The synthesized γ-Fe2O3/Al-ZnO NCs were employed to prepare conductometric gas sensors, then their sensing performances toward acetone were also investigated. Results revealed enhanced sensing performance of nanocomposites than both pure γ-Fe2O3 and Al-ZnO phases. In particular, the γ-Fe2O3(33%)/Al-ZnO based gas sensor showed the best sensing properties, like a high response of Rair/Rgas = 29, a short response time of 3 s, in addition to an improved selectivity toward acetone vs. ethanol at an operating temperature of 200 °C. Overall, ternary γ-Fe2O3/Al-ZnO NCs appear to be promising for the development of conductometric acetone sensors.
关键词： Nanocomposite,Iron oxide,Aluminium doped zinc oxide,γ-Fe2O3,Al-ZnO,Acetone,Gas sensor
更新于2025-09-10 09:29:36
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Organic WORM memory with carbon nanoparticle/epoxy active layer
摘要： Following the “All With One (AW1)” technology proposed in our earlier work, the present study is focused on the production and the characterization of write once read many (WORM) memory devices with a carbon nanoparticle/epoxy resin nanocomposite, where the main advantage stands on the ease of production of the nanostructured phase. The results revealed that short 100-ns, low-voltage (5.0-V) electric pulses are enough to record a bit, and the bit one to bit zero current state ratio ION∕IOFF reaches 107.
关键词： Organic WORM memory,epoxy resin,carbon nanoparticle,nanocomposite,electrical bistability
更新于2025-09-10 09:29:36
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High Temperature, Transparent, Superhydrophobic Teflon AF-2400/Indium Tin Oxide Nanocomposite Thin Films
摘要： The outstanding properties of Teflon AF-2400—chemical, optical, etc.—inspired us to make modifications to enhance its hydrophobicity. We prepared an AF-2400/Indium Tin Oxide Nanocomposite by a spin coating technique at room temperature, using the AF-2400 polymer as the matrix and indium tin oxide (ITO) nanoparticles as the filler. Different ITON concentrations ranging from 3 mg/ml to 30 mg/ml were prepared to study the effect of nanoparticle loading on the films’ properties and superhydrophobicity. The effect of spin speed and annealing temperature was also studied. Atomic force microscopy, x-ray photoelectron spectroscopy, and UV-vis analysis were employed to characterize the prepared films. The results indicate that the film’s low surface energy and nano/micro-features made it superhydrophobic. Increasing the ITON concentration to 15 mg/ml improved the superhydrophobicity of the composite film by increasing the surface roughness. The coating showed superhydrophobic behavior with a static contact angle around 152o and contact angle hysteresis less than 2o. The nanocomposite films also exhibited excellent thermal stability sustaining temperature as high as 240°C without losing its superhydrophobic behavior. Three models, Wenzel, Cassie-Baxter, and Shuttleworth-Bailey, were used to predict the static contact angle. The results confirmed that the latter model gave the best prediction. In addition to superhydrophobicity, the AF-2400/ITON films coated on a glass substrate showed very high transparency—around 95% in the visible and infrared range. An effective medium theory, the Bergman representation, was used to simulate the transmittance of the AF-2400/ITON nanocomposites. The measured and simulated transmittance values were in good agreement in the visible range. Based on our results, this coating may be highly useful for many practical applications, including solar cell coatings, chemical resistance protective coatings, and more.
关键词： High Temperature,Superhydrophobic,Nanocomposite,Indium Tin Oxide,Transparent,Teflon AF-2400
更新于2025-09-10 09:29:36
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Comparative study on the behaviour of Chitosan-Gelatin based Hydrogel and nanocomposite ion exchanger synthesized under microwave conditions towards photocatalytic removal of cationic dyes
摘要： The present work reports the comparison study of Chitosan-Gelatin based hydrogels with their nanocomposite ion exchangers synthesized under microwave conditions for the adsorption and photodegradation of the cationic dyes. In this report, the hydrogel based on Chitosan-Gelatin, more selective for anionic dyes is modified to nanocomposite ion exchanger by incorporating the zirconium (IV) selenophosphate1 to make it selective for cationic dyes. The nanocomposite was investigated with a tremendous hike in the degradation capacity (99% from 12%) of MB after being modified to nanocomposite ion exchanger. Adsorption process followed Langmuir adsorption (Qo = 10.46 mgg-1) and non linear PFO kinetic model with k1, qe (calculated), R2, RMSE = 0.011, 1.02 (mgg-1), 0.996, and 0.01709 respectively.
关键词： nonlinear PFO,ion exchanger,cationic dye,nanocomposite,Chitosan,Langmuir
更新于2025-09-10 09:29:36
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Preparation and characterization of graphene – TiO2 nanocomposite for enhanced photodegradation of Rhodamine-B dye
摘要： The synthesizing of TiO2@rGO nanocomposites using an efficient method has been carried out to enhance the photodegradation activities of TiO2. Reduced graphene oxide (rGO) synthesis has been illustrated as a key step. The preparation of TiO2@rGO is highly needed and recommended to develop an effective way for the reduction of GO. Our study illustrated an environmentally simple method for TiO2@rGO preparation and demonstrated its efficiency for photocatalytic process by utilizing rhodamine-B dye as an organic pollutant. Synthesized nanoparticles of reduced TiO2@rGO have an observable increase in photo-energy adsorption leading to the increase of the photodegradation reactions. From the obtained results, TiO2@rGO nanocomposites showed great ability to absorb photo-energy and enhance the photodegradation reactions. Moreover, the results revealed that the 3% TiO2@rGO have the best performance than 1% TiO2@rGO at pH = 9.0, 30 mg/l initial dye concentration and 60 min irradiation duration. The reduced graphene oxide production was considered as an influential co-catalyst for improving the TiO2 photocatalytic activities mainly owing to; the fast separation of h+/e? and the adsorption improvement. Our study affirms the production of promising applicable particles using the environmental photocatalysis process in particular with regard to wastewater purification.
关键词： Photocatalysis,Graphene oxide,Nanocomposite,TEM,Rh-B dye,TiO2,XRD
更新于2025-09-10 09:29:36