Nanostructured Nickel Research Articles

Development of a Nonenzymatic Colorimetric Sensor for the Detection of Uric Acid Based on Ionic Liquid-Mediated Nickel Nanostructures.

Uric acid (UA) is a metabolic byproduct of purine nucleotides and is excreted as a urine component. Abnormalities in UA metabolism cause localized inflammation due to crystal deposition and can lead to various diseases. In the current study, we successfully fabricated a biosensor based on 1-H-3-methylimidazolium acetate (ionic liquid, IL)-capped nickel nanoparticles (NiNPs) for the detection of uric acid in test samples. The structures of IL-capped NiNPs and their precursors were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffraction. The IL-capped NiNPs possessed intrinsic peroxidase-like properties and displayed selective UA quenching after interacting with 3,3′,5,5′-tetramethylbenzidine (TMB) solution. Different parameters such as pH, time, IL, TMB, and UA concentration were optimized to obtain the best results for the proposed sensor. The UA biosensor shows good responses in the linear range from 1 × 10–8 to 2.40 × 10–6 M, with a lower limit of detection of 1.30 × 10–7 M, a limit of quantification of 4.3 × 10–7 M, and an R2 value of 0.9994. For the colorimetric detection of UA, the proposed sensor gave a short time response of 4 min at room temperature and pH 7.5. The proposed sensing probe detects UA in real serum samples and could be used as a selective sensor for UA in the real sample detection.

Engineering the Heterogeneous Interface of Sulphur Doped Nickel-Manganese Oxide for Efficient Overall Electrochemical Water Splitting

Electrochemical water splitting is the technique to utilize stochastic renewable sources for a continuous uninterrupted supply of energy through the production of hydrogen fuel. However, the performance of a water electrolyzer is limited due to the instability as well as larger overpotential associated with the current state of the electrocatalysts. Transition metal oxides show remarkable potential for catalyzing water electrolysis. Among transition metal oxides, binary transition metal compounds exhibit the forte to replace the expensive and scarce noble-metal electrocatalysts. The engineering of hetero-interfaces between sulphur doped nickel and manganese oxide nanostructures has been systematically presented in our study. The difference in morphology too affects the catalytic activity of the samples owing to variable electrolyte interaction. The strategic development of these hetero-interfaces wields the electrocatalyst its superior bifunctional activity for catalyzing oxygen evolution reaction at an overpotential as low as 300 mV at 20 mA cm-2 current density and hydrogen evolution reaction at 280 mV at 10 mA cm-2 current density. The catalyst also delivered a stable current density for a long-term durability study without any significant loss in the performance.

Effect of the monolayer thickness on the mechanical behavior of layered nanostructure Ni fabricated by electrodeposition

Here five kinds of bulk layered nanostructured nickel (LNS Ni) composed of nano-sized grains (NG) layer and ultrafine grains (UFG) layer alternately according to the layer thickness ratio of 1:1 with the layer thickness spacing ranging from nearly 1 μm to 88 nm were prepared by electrodeposition to study the effect of monolayer thickness on the mechanical behavior of LNS Ni. Conventional continuous tension (CT) tests show that these five LNS Nis have greater plastic deformation ability than homogeneous nanostructured (NS) Ni and their mechanical behavior shows an obvious dependence on layer thickness. The strength of LNS Ni shows a linear upward trend with the decrease of layer thickness and furthermore exceeds that of homogeneous NS Ni after the layer thickness is reduced to 300 nm and the plasticity and toughness of LNS Ni decreases first and then increases with the decrease of layer thickness. As a result, an optimized mechanical property with high strength and high plasticity is obtained when the monolayer thickness is reduced to 88 nm. Such monolayer thickness-dependent mechanical behavior for LNS Ni should be attributed to the change of the contribution from interfacial coordinated deformation with the decrease of layer thickness due to the gradual increased proportion of the interface defects that affect dislocation activity. The tensile release and intermittent tension relaxation cycle (TRC) tests also illuminate that such layered structure can also effectively alleviate stress concentration during deformation, which should be another reason for the high plasticity and high toughness that LNS Ni holds.

Experimental and Numerical Modelling of a Nanostructured Nickel Ferrite-Based Ammonia Gas Sensor

Experimental and Numerical Modelling of a Nanostructured Nickel Ferrite-Based Ammonia Gas Sensor

Magnetic nickel nanostructure as cellulase immobilization surface for the hydrolysis of lignocellulosic biomass

In this research, a magnetic reusable nickel nanoparticle (NiNPs) supporting materials were prepared for cellulase enzyme immobilization. The immobilized cellulase showed high activity recovery, large & fast immobilization capacity and improved pH & temperature tolerance. The excellent stability and reusability enabled the immobilized cellulase to retain 84% of its initial activity after ten cycles. At 2 mg/mL enzyme concentration, highest 93% immobilization efficiency was achieved within two hours of immobilization. When the treatment temperature reached 40 °C and pH 5, the immobilized cellulase exhibited highest residual activity. The immobilized cellulase could be separated from the solution by a magnetic force. This study introduced a novel supporting material for cellulase immobilization, and the immobilized cellulase poses a great potential in the hydrolysis of lignocellulosic biomass which can used as an easily applicable and sustainable pre-treatment step for advanced biofuel production.

Nanostructured nickel doped zinc oxide material suitable for magnetic, supercapacitor applications and theoretical investigation

This Paper describes the synthesis of nickel doped ZnO is planned by chemical co-precipitation techniques. The prepared nanostructured nickel doped zinc oxide samples were analyzed by thermogravimetric differential thermal analysis (TG/DTA), X-ray diffraction (XRD), Fourier transform infra red (FTIR), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), electron paramagnetic resonance (EPR), and cyclic voltametry (CV). Nanostructure nickel doped ZnO materials have developed as promising for the basis of its broad range of employing in diverse areas. The attractive properties of nickel doped ZnO materials are highly demanded in high-energy potential applications. The nickel doped zinc oxide materials are hexagonal wurtzite arrangement is confirmed by XRD. The morphological -features of FE-SEM show nickel doped zinc oxide NPs are the structure of spherical type with agglomeration. The calculated particle size 11 nm is confirmed by HR-TEM. EPR spectra of nickel doped zinc oxide nanoparticles are ferromagnetic nature. Further, CV studies of Ni doped ZnO materials of the specific capacitance value is 133 Fg-1 at the scan rate 10 mVs−1 it is suitable for super capacitor application. The quantum chemical calculations were done by using DFT techniques through B3LYP/LANL2DZ level of basis set.

High-performance electrode materials for supercapacitor applications using Ni-catalyzed carbon nanostructures derived from biomass waste materials

Herein, nanostructured nickel metal, oxide, and oxyhydroxides have been successfully grown on various types of carbon nanostructures (CNS) via a simple, low cost and eco-friendly route derived from biomass waste materials. Nickel oxide and oxyhydroxide phases could be detected in the roasted precursor materials before pyrolysis as confirmed by X-ray diffraction (XRD) analysis. Transmission electron microscopy (TEM) images showed that these samples were composed mainly of porous amorphous carbon nanostructures. Whereas nickel-metal and nickel oxyhydroxide were the predominant detected phases after pyrolysis in addition to the graphite and carbon phases in the form of carbon nanotubes as confirmed by XRD analysis and TEM investigation, respectively. These composites were explored as potential electrodes for supercapacitor application delivering satisfactory specific capacitance values beside its remarkable charge/discharge reversibility. Among them, the formed porous amorphous carbon nanostructure sample decorated with NiO species displayed the highest capacitive performance. This sample delivered a specific capacitance of 508 F g−1 at 1 A g−1. Moreover, the cycling stability behavior of this sample at 5 A g−1 delivered 78% of its initial capacity after 3000 GCD cycles. The obtained results suggested that the prepared materials are a promising candidate as electrode material for energy storage applications.

Формирование субмикронной конусообразной морфологии поверхности при ионно-лучевом распылении наноструктурного никеля

The results of a research on the surface morphology of nanostructured nickel after high-fluence irradiation with 30 keV argon ions have been presented. The nanostructure in nickel was formed by high-pressure torsion deformation. It has been shown that nanostructuring deformation of nickel by ion-beam sputtering allows to receive a uniformly coated surface with submicron cones. The thermal stability of the obtained cone-like structure on nanostructured nickel has been determined.

Formation of submicron cone-shaped surface morphology under ion-beam sputtering of nanostructured nickel

The results of a research on the surface morphology of nanostructured nickel after high-fluence irradiation with 30 keV argon ions have been presented. The nanostructure in nickel was formed by high-pressure torsion deformation. It has been shown that deformation nanostructuring of nickel and subsequent ion-beam sputtering allows receiving a surface uniformly coated with submicron cones. The thermal stability of the obtained cone-shaped structure on nanostructured nickel has been determined. Keywords: nanostructure, high-pressure torsion, ion irradiation, cones, thermal stability.

Efficient photocatalytic degradation of eosin blue dye and antibacterial study using nanostructured zinc oxide and nickel modified zinc oxide

This article describes the fabrication of ZnO and 5% Ni2+ modified ZnO nanocatalyst (Ni/ZnO) for the photocatalytic degradation of eosin blue (EB) dye. To demonstrate the successful formation of nanocatalyst and study the structural and morphological aspects, as well as the chemical compositions, we employed X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) techniques. The optical band gap was investigated using Ultraviolet–visible (UV–Vis) spectroscopy, whereas the Zn-O band was revealed using Fourier transform infrared (FTIR) spectroscopy. To illustrate the optimized photocatalytic conditions for the degradation of EB dye, the parameters like initial EB dye concentration, catalyst loading, pH effect, and contact time were investigated. When compared to undoped ZnO and other reported nanocatalyst, the Ni/ZnO nanocatalyst displayed significantly better photocatalytic performance in the photocatalytic degradation of EB dye. With 0.8 g/L catalyst loading, 110 min contact period, and 8.0 pH, the photocatalytic efficiency was higher. Under optimized photocatalytic conditions, the results suggested that a Ni/ZnO nanocatalyst could be a potential nanomaterial for developing an enhanced doped nanocatalyst for EB removal. To confirm the presence of reactive oxygen species during photocatalysis, a radical scavenging experiment was performed using benzoquinone and isopropyl alcohol scavengers. The reusability of the produced nanocatalyst for four cycles confirms its stability and efficiency over multiple cycles. Furthermore, the Ni/ZnO was found to have significant antibacterial action against Staphylococcus aureus.

Optimization and Characterization of Spray Pyrolysis Synthesized Nanostructured Nickel Oxide Films

Optimization and Characterization of Spray Pyrolysis Synthesized Nanostructured Nickel Oxide Films

On the electrodeposition of conically nano-structured nickel layers assisted by a capping agent

• Systematic study of capping agent concentration during electrodeposition of Ni nanostructures. • Optimum deposition conditions for conical growth are derived. • New modeling approach to simulate and quantify local growth of cones. Capping agents are frequently used in electrodeposition to support spatially inhomogeneous mass transfer at small scales. As such, chloride ions are known to support the deposition of conically nanostructured nickel layers. This work presents a systematic experimental study of the impact of a capping agent on the electrochemical growth of conically-shaped nickel deposits. Furthermore, a modeling approach on the scale of cones for numerical simulations of electrodeposition with capping agents is provided for the first time to give deeper insight on how the capping agent influences the local growth of the deposit. The growth rates of the nano-cones obtained numerically are compared with experimental data, and a good agreement is found. The impact of the capping agent concentration, the deposition time, the electrolyte temperature and the current density are investigated systematically, and optimum conditions for conical growth are derived.

A nano-structured nickel trithiocarbonate complex supported on g-C3N4 as an efficient electrocatalyst for urea electro-oxidation

Urea electro-oxidation in alkaline medium catalysed by nickel trithiocarbonate complex and g-C3N4 composite.

Enhanced Electrochemical Based DNA Sensing Platform for the Yellow Rust Detection in the Wheat Using Nanostructured Nickel Oxide Thin Film

Enhanced Electrochemical Based DNA Sensing Platform for the Yellow Rust Detection in the Wheat Using Nanostructured Nickel Oxide Thin Film

Template assisted nano-structured nickel for efficient methanol oxidation

Nanoporous nickel has been prepared by electrodeposition using non-ionic surfactant based liquid crystalline template under optimized processing conditions. Physicochemical properties of nanoporous nickel are systematically characterized through XRD, SEM and AFM analyses. Comparison of electrocatalytic activity of nanoporous nickel with smooth nickel was interrogated using cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) analyses. Distinctly enhanced electrocatalytic activity with improved surface poisoning resistance related to nanoporous nickel electrode towards methanol oxidation stems from unique nanoporous morphology. This nanoporous morphology with high surface to volume ratio is highly beneficial to promote active catalytic centers to offer readily accessible Pt catalytic sites for MOR, through facilitating mass and electron transports.

Nickel-gold bimetallic nanostructures with the improved electrochemical performance for non-enzymatic glucose determination

Bimetallic nanostructured electrodes are promising candidates for non-enzymatic glucose detection due to their excellent selectivity and high sensitivity. In this work, a bimetallic Ni/Au non-enzymatic glucose sensor was developed by the electrodeposition of nickel nanostructures on Au nanoparticles (NP). Physical vapor deposition followed by thermal annealing was used for the growth of seeding Au (NP) on fluorine doped tin oxide (FTO) substrates. The electrochemical growth of Ni nanostructures on the Au-seeded substrates led to enhanced electrochemical responses from the modified electrodes. Cyclic voltammetry results showed considerable improvement of the electrocatalytic activity of the Ni/Au bimetallic structure in comparison to monolithic Ni and Au structures due to the synergistic effect. The sensor showed two linear ranges of 5 μM–3.5 mM and 3.5–7 mM for glucose detection with the sensitivity of 893 (μA mM−1 cm−2). The low detection limit of 0.7 μM and the fast response time of 5 s was achieved. The selectivity, reproducibility and accuracy of the fabricated sensor in determination of human serum glucose suggest its potential for large-scale production as commercial non-enzymatic glucose detection.

Production and characterization of high-performance cobalt–nickel selenide catalyst with excellent activity in HER

Designing of complex nanostructure with a high specific surface area using transition metal selenide seems to be a necessity in response to the challenges of the hydrogen release process for renewable energy. Herein, we synthesized the electrocatalyst nickel foam-supported with nanostructured nickel–cobalt selenide using the hydrothermal process at 150 and 180 °C and has been investigated in hydrogen evolution reaction. Synthesis of nickel–cobalt selenide nanostructure on nickel foam carried out with different Ni+2:Co+2 mol ratios of 0:10, 2:8, 6:4, 4:6, 8:2, and 10:0 in the structure of electrodes. The XRD results indicate the formation of the nickel–cobalt selenide phase in different ratios. The FESEM and TEM results show the formation of mesoporous three-dimensional nano-lactic with petal thickness in the range of 20–30 nm. Also, to evaluate the properties and electrocatalytic efficiency, electrochemical tests of Tafel slope, cyclic voltammetry, linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS) were used. The Tafel result test shows a cathodic slope of −61.3 mV and an exchange current density of 0.86 mA cm−2 in the Ni8Co2Se-150 (Ni+2:Co+2 = 8:2) sample, which LSV shows −185 mV at a current density of −10 mA cm−2. EIS test shows a polarization resistance value of 2744 Ω for mentioned sample and was selected as the best sample with the highest catalytic activity.

Features of the Synthesis of the Dispersed TiC Phase with Nickel Nanostructures on the Surface to Create an Aluminum-Based Metal Composite.

The development of new composites with improved functional properties is the important task of modern materials science. The composites must be structurally organized to provide improved properties. For metal-ceramic composites, there is a need for a uniform distribution of the dispersed ceramic phase in the bulk metallic matrix The modification of the dispersed ceramic phase surface with a metal coating is one of the more effective ways to accomplish this. Particularly, in this work, the conditions of Ni nanolayer deposition on titanium carbide (TiC) particles were studied. The goal was to create core–shell particles with a thickness of the Ni coating on TiC not exceeding 90 nm. Preliminary work was also carried out to study the effect of the dispersed phase composition on the mechanical properties of the composite with an Al matrix.

Nanostructured nickel sulphate: properties and applications in marmalade production

The paper presents the data on the use of nanostructured nickel sulfate in the production of marmalade as a functional food product for prophylactic purposes. The nanoparticle tracking analysis (NTA method) was used to determine the size of nanostructured nickel sulfate. In this case, the smallest size (25.7 nm) is formed only in gellan gum with a core:shell ratio of 1:1. When the core:shell ratio in gellan gum is 1:3, the average size of nanocapsules is 49.9 nm. This result can be explained by the tighter packing of cobalt sulfate in the capsule. In sodium alginate, the average nanocapsule size is already 191 nm. The polydispersity index in all studied shells and at different core:shell ratios are practically equal and amounts to 0.84–1.09, which corresponds to a spherical shape.

Insights into the deposition of nanostructured nickel oxides by amino acid chelated Complexes: Benefits of mixed side chains in the formation of nanostructures for Energy-efficient Electrochromic windows

Electrochromic (EC) windows enhance the energy efficiency of climate control systems in the building sector. Here, we evaluate a strategy for electrodeposition of a high-performance EC nickel oxide by controlled release of Ni(II) ions from amino acid ligands. We compare the structural properties and EC characteristics of the samples deposited from Ni(II)-L-alanine or Ni(II)-phenylalanine complexes. During the deposition process, a film containing closely packed nanodeposits was formed by rapid release of Ni(II) ions from L-alanine ligands. This structure led to a high coloration efficiency of 76.4 cm2/C and nearly 100% retention of the initial optical modulation value even after 60 cycles of coloration. In contrast, the slow release of Ni(II) ions from phenylalanine ligands resulted in the formation of conglomerated island structures, which caused a low coloration efficiency and poor cycling stability. However, the bulky aromatic side chains on phenylalanine could passivate the sample surface, thereby lowering the transmittance loss to 1.38% under 24 h voltage-off. The aromatic side chains also contributed to the charge transfer between the solid–liquid interface of the sample. Furthermore, the sample deposited from the mixed L-alanine and phenylalanine complexes show greatly improved EC performance without compromising its superior optical memory and fast charge transfer characteristics.