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ZnO/Ag NANOPARTICLE-DECORATED SINGLE-WALLED CARBON NANOTUBES (SWCNTs) AND THEIR PROPERTIES
摘要： Raw single-walled carbon nanotubes (SWCNTs) were oxidized by using sulfuric acid and nitric acid at 3:1 ratio to produce oxygen functional groups attached to SWCNTs surfaces. Then, the oxidized SWCNTs are coated with zinc oxide and silver nanoparticles by chemical precipitation route to synthesize ZnO/Ag-SWCNTs nanocomposite material. The nanocomposite sample was analyzed via zeta potential analyzer, ultraviolet-visible (UV-Vis) spectrophotometer, ˉeld emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), X-ray di?raction (XRD), and Raman spectroscopy to investigate colloidal stability, optical, morphological, and structural properties. The SWCNT properties were found to be changed after the addition of ZnO/Ag nanoparticles. Hence, the new ZnO/Ag-SWCNTs nanocomposite is a good candidate for photocatalyst applications and biological applications.
关键词： biological applications,photocatalyst applications,Single-walled carbon nanotubes (SWCNTs),ZnO/Ag nanocomposite,chemical precipitation
更新于2025-09-23 15:21:01
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Enhanced degradation efficiency of mixed industrial effluent by modified nanocomposite photocatalyst under UVLED irradiation
摘要： The aim of this study is to investigate the enhancement of photocatalytic degradation capacity of mixed industrial effluent using a modified activated charcoal/TiO2 nanocomposite catalyst. These nanocomposite catalysts are synthesized by the sol–gel method. The synthesized nanocomposite materials were characterized to confirmed material morphology and size by DLS, FTIR, crystallographic phase analysis (XRD), SEM, UV–Vis spectra, TGA and BET. This modified AC/TiO2 nanocatalyst removal efficiency is evaluated by photocatalytic degradation of mixed industrial effluent under UVLED light irradiation in different time intervals. The results demonstrate that the COD and BOD show 97% and 94% removal, respectively, at 90 min after that the degradation value becomes constant. Photocatalytic degradation of industrial effluent using AC/TiO2 followed pseudo-first-order reaction kinetics, and reaction rate constant was 1.04 × 10?2. Therefore, the performed experiment concludes that removal efficiency enhances to increase reaction time under UVLED irradiation.
关键词： UVLED irradiation,Photocatalytic degradation,Activated charcoal/TiO2 nanocomposite,Mixed industrial effluent
更新于2025-09-23 15:21:01
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[Materials Horizons: From Nature to Nanomaterials] Advances in Polymer Sciences and Technology (Select Papers from APA 2017) || Structural and Morphological Analysis of Newly Synthesized CuO@Alginate Nanocomposite with Enriched Electrical Properties
摘要： CuO@Alginate (CuO@Alg) nanocomposite has been synthesized by simple, inexpensive and highly efficient Sol-Gel method. The morphology and structural properties of synthesized nanocomposite (CuO@Alg) and pure CuO nanoparticles have been analyzed as a function of temperature. The morphological and structural properties were investigated by using TEM, SEM, EDX, and X-ray diffraction. The crystalline nature of CuO nanocomposite showed by X-ray diffraction (XRD) pattern and average crystalline size was observed approximately 18.09 nm. The effect of size quantization on morphology was also observed. Dielectric behavior of CuO and CuO@Alg has been also studied as a function of increasing frequency by LCR meter. With the increase in frequency, the dielectric constant was found to decrease and alternative current (A.C.) conductivity value was found to increase. This study was also representing a useful step towards the establishment of a structure–property relationship for CuO nanocomposite.
关键词： Nanocomposite,Copper oxide,Electrical conductivity
更新于2025-09-23 15:21:01
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Facile preparation of self-assembled MXene@Au@CdS nanocomposite with enhanced photocatalytic hydrogen production activity; è?a???è￡??o3?±3?¤??????????MXene@Au@CdS???????¤????????????????????°￠?′???§;
摘要： Photocatalytic hydrogen production is considered a promising approach to generating clean sustainable energy. However, the conventional co-catalyst (e.g., Pt) used in photocatalytic hydrogen production is high-cost and difficult to obtain. Here, we designed and prepared a ternary nanocomposite MXene@Au@CdS, which can be used in the field of efficient and excellent photocatalytic hydrogen production. The MXene@Au@CdS has a hydrogen production rate of 17,070.43 μmol g?1 h?1 (tested for 2 h), which is 1.85 times that of pure CdS nanomaterials. The improved hydrogen production performance of the MXene@Au@CdS is attributed to: (i) MXene provides more active adsorption sites and reaction centers for Au and CdS nanoparticles; (ii) the synergistic effect of Au’s strong surface plasmon resonance expands the optical response range of CdS. Therefore, this work solves the problem of the solid connection between the surface functional groups of photocatalyst, and achieves rapid interface charge transfer and long-term stability during the hydrogen production.
关键词： MXene,nanocomposite,photocatalytic hydrogen production
更新于2025-09-23 15:21:01
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Ionic relaxation of electrospun nanocomposite polymer-blend quasi-solid electrolyte for high photovoltaic performance of Dye-sensitized solar cells
摘要： New quasi-solid electrolytes were developed by blending PVDF-HFP and PMMA with dispersed TiO2 nanoparticles as fillers and electrospun as, nanofibrous porous membranes activated in electrolyte solutions with various redox couples. Among them, PVDF-HFP/ PMMA 6 wt% TiO2 with LiI based redox electrolyte have achieved highest conductivity of 2.26 × 10?2 Scm-1 and power conversion efficiency (PCE) of 7.081% for its fabricated DSSC. The dynamics of the ionic transport of charge carriers of the developed electrolyte membranes were studied using Random barrier model. The relaxation mechanisms of ionic charge carriers were analysed by Havriliak–Negami formulation. It is inferred that the conductivity is dominated by electrode-polarization and ionic charges exhibit non-debye behaviour in conducting mechanism.
关键词： Electrolyte intake,Nanocomposite,Electrospinning,Relaxation
更新于2025-09-23 15:21:01
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Synergistic effect of (3-Aminopropyl)Trimethoxysilane treated ZnO and corundum nanoparticles under UV-irradiation on UV-cutoff and IR-absorption spectra of acrylic polyurethane based nanocomposite coating
摘要： ZnO and corundum (a –Al2O3) nanoparticles were successfully synthesized by aqueous precipitation and sintering techniques respectively. ZnO nanoparticles were effectively coated with (3-aminopropyl)trimethoxysilane (APTMS) by polycondensation method to prevent the photocatalytic activity of ZnO during a UV-weathering study. X-ray diffractogram and FTIR were used to confirm the crystalline structure of as prepared nanoparticles, blue shift of the Al-O bond and the formation of a secondary amine via polycondensation of APTMS over ZnO surface. The prepared APTMS-ZnO, corundum and commercially available surface modified hydrophobic SiO2 (M–SiO2) nanoparticles were used to prepare the acrylic polyurethane (AP: Poly-Macrynal? SM 510N coating resign) bases nanocomposite coating on a polyurethane substrate. Individual and mixed nanoparticles were dispersed into acrylic polyurethane to prepare the coating layer on polyurethane film substrate separately. IR-active and UV-visible regions of the FTIR and UV-Vis spectroscopies were used to investigate the synergistic effect of the nanoparticles on a selected range of the radiative spectrum, especially the UV-resistant and IR-absorption properties of the coated films with and without exposure of UV-irradiations. Polyurethane substrate coated with APTMS-ZnO (2wt%) based acrylic polyurethane-based nanocomposite coating (APUC) layer containing 2 wt% corundum (D50) and 6 wt% M-SiO2 (F50) exhibited 98.77% and 97.60% of UV-resistant property respectively. These results indicate that the visible light transparency and transmittance ability reduced significantly after 500h of UV-irradiation exposure. Both of the activity and deformation have great impact on the IR-absorption property of the APUC.
关键词： Corundum,UV-resistant,charge-transfer activity,Nanocomposite coating film,IR- absorption,APTMS-ZnO
更新于2025-09-23 15:21:01
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BiOCl Nanoplates Decorated on g-C3N4 for Enhanced Photocatalytic Activities
摘要： A facile solvothermal method has been successfully developed for the preparation of BiOCl/g-C3N4 nanocomposite using sodium dodecyl benzene sulfonate as the surfactant. The results revealed that BiOCl nanoplates with thickness below 5 nm and widths of 20~30 nm were uniformly dispersed on the surface of g-C3N4 nanosheets, indicating the formation of a close contact between the BiOCl and g- C3N4. The catalytic activity of the obtained BiOCl/g-C3N4 composite has been evaluated by the degradation process of rhodamine B under visible light irradiation. It has been demonstrated that the catalytic activity of BiOCl/g-C3N4 composite was significantly enhanced compared with the bare component due to the synergistic effect between BiOCl and g-C3N4.
关键词： BiOCl,Nanocomposite,Surfaces,Photocatalyst,g-C3N4
更新于2025-09-23 15:21:01
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[Springer Series on Polymer and Composite Materials] Polymer/POSS Nanocomposites and Hybrid Materials (Preparation, Properties, Applications) || POSS Hybrid Materials for Medical Applications
摘要： Medical application is one of the most important issues in the field of material science and has found very high level of attention. During the last decades, the development of new methods or materials which can improve the quality of medical services has been very intense. Using nanotechnology provides new rooms to enhance this field. Polyhedral oligomeric silsesquioxane (POSS) is a new generation of nanostructures showing the properties of nanoparticles and molecules at the same time. Improving thermal and mechanical properties and enhanced solubility are interesting characteristics found in these materials. POSS can be used in medical applications, broadly. It can improve mechanical properties of biomaterials that are very important in tissue engineering. Also, it can improve the resistance of biomaterials against degradation. Today, dental materials use POSS as a key component. Drug delivery and bioimaging are other examples that use POSS as discussed in this chapter.
关键词： POSS,Dental nanocomposite,Bioimaging,Biomaterial,Drug delivery,Tissue engineering
更新于2025-09-23 15:21:01
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PMMA-BN composites incorporated with Au nanoparticle fabricated by laser ablation
摘要： As a class of layered materials, two dimensional (2D) materials have attracted great attention all around the world due to their inherent use for next generation nano technology devices. We can see 2D materials including carbon in our daily life and at many places, for instance, graphite, diamond and so on. New study is also being conducted to produce new functional materials by combining 2D material and polymer. Hexagonal boron nitride (h-BN) which is one kind of 2D material is dispersed in Poly methyl methacrylate (PMMA) or poly styrene (PS). The composite material of h-BN coated with polymer shows an improvement in the properties such as the higher thermal conductivity and higher mechanical strength. In this study, the composite material of PMMA, h-BN and gold nanoparticles has been synthesized. Boron nitride nano-structures were prepared by nanosecond laser ablation in acetone and was carried out at room temperature with laser ablation time of 120 min. The PMMA films were made by PMMA granules dissolved in acetone solvent and then mix with h-BN and gold colloid solution. The prepared composite films were characterized by scanning electron microscopy (SEM), and UV-vis spectroscopy. Such type of unique 2D nano-composite materials make their mark for the future exploitation in electronics and nanocomposite-related applications.
关键词： gold nanoparticles,nanocomposite,2D materials,PMMA,laser ablation,h-BN
更新于2025-09-23 15:19:57
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A simple route for manufacture of photovoltaic devices based on chalcohalide nanowires
摘要： The one-dimensional nanostructures of antimony sulfoiodide (SbSI) have received in last decade a great attention due to their outstanding photoferroelectric properties combined with narrow energy band gap beneficial for effective conversion of visible light into electric signal. This paper reports for the first time a simple and fast route for fabrication of photovoltaic devices based on SbSI nanowires. This method involves sonochemical synthesis of SbSI nanowires and spin-coating SbSI-polyacrylonitrile (PAN) composite, on indium tin oxide (ITO) substrate. In order to promote efficient charge transfer titanium dioxide (TiO2) and poly(3-hexylthiophene) (P3HT) were applied as an electron and hole transporting layers, respectively. Proposed method can be realized at mild conditions and does not require any additional high temperature treatment in contrast to other methods known for fabrication of SbSI photovoltaic structures. Fabricated structures exhibited an average short-circuit current density of 1.84(20) μA/cm2 and open circuit voltage of 69(13) mV under a white light illumination with power density of 100 mW/cm2. SbSI nanowires as lead-free nanomaterials are promising for solar energy harvesting and an application in photodetectors, that can operate in self-powered mode.
关键词： Nanocomposite,Self-powered photodetectors,Nanowires,Polyacrylonitrile (PAN),Antimony sulfoiodide (SbSI),Photovoltaic devices
更新于2025-09-23 15:19:57