Nickel Nanofibers Manufactured via Sol-Gel and Electrospinning Processes for Electrically Conductive Adhesive Applications (original) (raw)
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Transparent nanostructured electrodes: Electrospun NiO nanofibers/NiO films
Thin Solid Films, 2016
Polyvinylpyrrolidone (PVP)/Nickel(II) acetate precursor fibers were deposited by electrospinning directly on radio frequency sputtered thin Ni and NiO films grown on quartz substrate, starting from Ni(II) acetate and PVP solution in ethanol. The samples were calcined in air in the temperature range 400500 °C to obtain transparent and conductive p-type NiO nanofibers on NiO films. A higher density of nanofibers was obtained on Ni/quartz substrates, as compared to NiO/quartz ones, demonstrating the feasibility of fiber adhesion directly to an insulating substrate previously coated by a thin Ni layer. Samples were characterized by Field Emission-Scanning Electron Microscopy, X-ray diffraction, spectrophotometric and resistance measurements.
Study on Morphology and Size Distribution of Electrospun NiO-GDC Composite Nanofibers
Journal of Engineered Fibers and Fabrics, 2015
Nickel oxide-gadolinium doped ceria (NiO– Ce0.8Gd0.2O1.9) deserves special attention because of its high ionic conductivity. The nanocomposite fibers of this material are suitable as anode materials for low-temperature SOFCs. The composition and morphology of the nanofibers which prepared via electrospinning method were characterized by SEM, TEM and EDS. It was noticed that the fiber diameters gradually decreased from 190±77 nm to 75±27 nm by increasing the calcination temperature from 800 °C to 1000 °C. Further, the influence of the different parameters such as concentration of the polymeric pre-spinnable solution (CPS), concentration of the cationic solution (CCS), the applied voltage, tip-target distance, feed rate, diameter of the needle and the calcination temperature on the morphology of the fibers were investigated.
Dependence of NiO microstructure on the electrospinning conditions
Ceramics International, 2014
A strong effect of the electrospinning conditions on NiO microstructure was noticed. Viscous solutions containing nickel nitrate (Ni(NO 3 ) 2 ), polyvinylpyrrolidone (PVP), ethanol (C 2 H 5 OH), and H 2 O were prepared. Produced electrospun fibers were thermally treated. The chemical composition of the viscous solution, the time of electrospinning and calcination played a crucial role in the formation of corresponding nickel oxide (NiO) microstructures. At a lower Ni(NO 3 ) 2 concentration a porous microstructure consisting of interconnected fibers was obtained, whereas at a higher Ni(NO 3 ) 2 concentration a laminar microstructure was obtained. The formation of metallic Ni was assigned to the reducing action of PVP during the heating of electrospun fibers. Based on EDS and XRD analyses it was suggested that metallic Ni was restricted to the surface of NiO particles. With a prolonged heating time at increased temperature metallic Ni was reoxidized to NiO.
Preparation and Characterization of NiTi/PVA Nanofibers by Electrospinning
Engineering and Technology Journal, 2021
Preparation of ultrafine NiTi particles by immersing sintered alloy in aqua regia. Preparation of composite biomedical NiTi /PVA nanofibers. Preparation of Nitinol nanofibers with polyvinyl alcohol. NiTi alloys are widely used in biomedical applications for their unique properties particularly the shape memory effect, superelasticity, and biocompatibility. In this research, NiTi/PVA composite nanofibers are fabricated by electrospinning technique, using a novel method of producing NiTi ultrafine particles by immersing amorphous NiTi alloy in dilute aqua regia solution. The NiTi particles are successfully embedded in the PVA matrix. The produced NiTi particles are analyzed by X-ray diffraction (XRD), Energy dispersive spectroscopy (EDS), and Particle size analyzer. The XRD pattern of ultrafine NiTi particles shows much better phases as compared to the XRD pattern of the amorphous NiTi alloy sample. The morphology of the produced NiTi/PVA composite nanofibers are characterized b...
Functional properties of electrospun NiO/RuO2 composite carbon nanofibers
Journal of Alloys and Compounds, 2012
One-dimensional (1D) nickel oxide/ruthenium oxide (NiO/RuO 2 )-carbon composite nanofibers (NiRu-C-NFs) were fabricated via electrospinning of a homogenous mixture of polyacrylonitrile (PAN) and Ni/Ru salt precursors at different ratios followed by heat treatments. The 1D nanostructures of the composite material were characterized by field-emission scanning electron microscopy (FE-SEM), powder X-ray diffraction (XRD), Rietveld refinement and Brunauer-Emmett-Teller (BET) surface area measurements. Li-cycling properties were evaluated using cyclic voltammetry and galvanostatic properties. The asymmetric hybrid supercapacitor studies were carried out with activated carbon as a cathode and NiRu-C-NFs composites as anodes in the cycling range, 0.005-3.0 V using 1 M LiPF 6 (EC;DMC) electrolyte. NiRu-C-NFs fabricated from 5 wt% nickel (II) and 15 wt% ruthenium (III) precursors showed a capacitance up to ∼60 F g −1 after 30 cycles. Anodic Li-cycling studies of NiRu-C-NF-0 and NiRu-C-NF-2 composite samples showed a reversible capacity of 230 and 350 m Ahg −1 at current rate of 72 mA g −1 at the end of 40th cycle in the voltage range of 0.005-3.0 V. Electrochemical impedance studies (EIS) on NiRu-C-NFs showed lower impedance value for 15 wt% Ru than the bare sample.
Materials Chemistry and Physics, 2014
h i g h l i g h t s NiO, ZnO and NiOeZnO/PSU nanofibers have been fabricated by electrospinning method. The structural, morphological and optical properties were investigated. XRD data confirm the wurtzite structure for ZnO and crystalline structure with cubic phase for NiO. The fluorescence spectra of metal oxide/PSU nanofibers were analyzed. These composites could have potential application in photocatalysis, photovoltaics and sensing.
Preparation of the Ni doped carbon nanofibers synthesized by electrospinning
SMART ENERGY AND SUSTAINABLE ENVIRONMENT, 2020
Article info: Carbon nanofibers are very stiff, strong and light materials composed from tightly packed layers of graphite sheets stacked parallel one near the other in a regular pattern and aligned along the fiber axis. This study presents a facile approach to prepare composite Ni/C nanofibers through electrospinning of polymer solution. A mixed solution of polyacrylonitrile (PAN) in dimethylformamide (DMF) solvent along with Ni(CH 3 COO) 2 was the precursor solution used to obtain composite Ni/C nanofibers. The amount of Ni salt was varied in order to study the influence of Ni percent on the composite fibers properties, particularly the pores dimension and the specific surface area. The composition and the structure of materials were investigated through elemental analysis and scanning electron microscopy (SEM). In addition, thermal gravimetric analysis (TGA) was performed to complete the composition study and the thermal degradation profile.
Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi
In this study mechanical and thermal properties of epoxy resin reinforced with different numbers of nanofiber layers which produced with electrospinning method was investigated. Solution of 10 wt% of polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF) was used for electrospinning. The diameters of the obtained nanofibers were in the range of 380-420 nm. The average thickness of the produced nanofiber layer was about 200 µm. The special molds were prepared to produce the laminated composite plates. The tensile tests show that the using of nanofiber PAN layers increase the tensile force 34.54% and decrease the elongation 8.87% in comparison with neat epoxy. The fracture surfaces of the specimens were inspected by using optical and scanning electron microscopy (SEM). The thermal properties of the nanofiber layered composites were determined by thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis. It was observed that the glass transition temperature increased parallel to this as the number of PAN layers increased and rose up to 86ᵒC, while the thermal stability did not show much effect of PAN layers.