Nickel nanoparticles with hcp structure: Preparation, deposition as thin films and application as electrochemical sensor

Neiva, Eduardo G.C.; Oliveira, Marcela M.; Marcolino‐Júnior, Luiz H.; Zarbin, Aldo J. G.

doi:10.1016/j.jcis.2016.01.036

Cited by 38 publications

(16 citation statements)

References 31 publications

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“…In the past decade, several research groups have developed metal oxide nanoparticles using savvy routes 1 2 . Among them, a significant category of zinc oxide nanoparticles (ZnO-NPs) have gained importance since few years.…”

mentioning

confidence: 99%

Sol-gel synthesis of thorn-like ZnO nanoparticles endorsing mechanical stirring effect and their antimicrobial activities: Potential role as nano-antibiotics

Khan

Ansari

Hameedullah

et al. 2016

Sci Rep

275

134

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The effect of mechanical stirring on sol-gel synthesis of thorn-like ZnO nanoparticles (ZnO-NPs) and antimicrobial activities is successfully reported in this study. The in-house synthesized nanoparticles were characterized by XRD, SEM, TEM, FTIR, TGA, DSC and UV-visible spectroscopy. The X-Ray Diffraction analysis revealed the wurtzite crystal lattice for ZnO-NPs with no impurities present. The diametric measurements of the synthesized thorn-like ZnO-NPs (morphology assessed by SEM) were well accounted to be less than 50 nm with the help of TEM. Relative decrease in aspect ratio was observed on increasing the agitation speed. The UV-visible spectroscopy showed the absorption peaks of the ZnO-NPs existed in both UVA and UVB region. A hypsochromic shift in λmax was observed when stirring pace was increased from 500 rpm to 2000 rpm. The FTIR spectroscopy showed the absorption bands of the stretching modes of Zn-O between 500 cm−1 to 525 cm−1. The Thermal analysis studies revealed better stability for ZnO-NPs prepared at 2000 rpm (ZnO-2000 rpm). TGA revealed the weight loss between two main temperatures ranges viz. around (90 °C–120 °C) and (240 °C–280 °C). Finally, the effect of ZnO-NPs prepared at different stirring conditions on the growth of Gram-positive (Bacillus subtilis), Gram-negative (Escherichia coli) bacteria and a fungi (Candida albicans) were examined; which showed good antibacterial as well as antifungal properties. These findings introduce a simple, inexpensive process to synthesize ZnO-NPs using conventional methods without the use of sophisticated equipments and its application as a potent nano-antibiotic.

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mentioning

confidence: 99%

Sol-gel synthesis of thorn-like ZnO nanoparticles endorsing mechanical stirring effect and their antimicrobial activities: Potential role as nano-antibiotics

Khan

Ansari

Hameedullah

et al. 2016

Sci Rep

275

134

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“…In the same way for the batteries, the use of nanocomposites of Ni(OH) 2 with graphene improves the performance of this material, increasing coloration efficiency and stability 35 . In which concerns its application as sensor, we demonstrate recently the use of Ni(OH) 2 -modified electrodes to detect glycerol, an important analyte in the pharmaceutical and biofuel fields 36 37 . However, to the best of our knowledge, there are no reports employing graphene/nickel hydroxide nanocomposite for this application.…”

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confidence: 99%

One material, multiple functions: graphene/Ni(OH)2 thin films applied in batteries, electrochromism and sensors

Neiva

Oliveira

Bergamini

et al. 2016

Sci Rep

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Different nanocomposites between reduced graphene oxide (rGO) and Ni(OH)2 nanoparticles were synthesized through modifications in the polyol method (starting from graphene oxide (GO) dispersion in ethylene glycol and nickel acetate), processed as thin films through the liquid-liquid interfacial route, homogeneously deposited over transparent electrodes and spectroscopically, microscopically and electrochemically characterized. The thin and transparent nanocomposite films (112 to 513 nm thickness, 62.6 to 19.9% transmittance at 550 nm) consist of α-Ni(OH)2 nanoparticles (mean diameter of 4.9 nm) homogeneously decorating the rGO sheets. As a control sample, neat Ni(OH)2 was prepared in the same way, consisting of porous nanoparticles with diameter ranging from 30 to 80 nm. The nanocomposite thin films present multifunctionality and they were applied as electrodes to alkaline batteries, as electrochromic material and as active component to electrochemical sensor to glycerol. In all the cases the nanocomposite films presented better performances when compared to the neat Ni(OH)2 nanoparticles, showing energy and power of 43.7 W h kg−1 and 4.8 kW kg−1 (8.24 A g−1) respectively, electrochromic efficiency reaching 70 cm2 C−1 and limit of detection as low as 15.4 ± 1.2 μmol L−1.

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“…Nickel magnetic nanoparticles are of great interest due to their superparamagnetic and optical properties. There have been many protocols for the synthesis of cobalt or nickel magnetic nanoparticles, which include thermal decomposition, reverse micelles, chemical reduction, and polyol reduction, and for cobalt magnetic nanoparticles also sonochemical synthesis [54][55][56][57][58][59][60][61][62]. There are also many alloy-bimetallic magnetic nanoparticles that include various systems, such as iron-cobalt, nickel-cobalt, iron-platinum, and cobalt-platinum.…”

Section: Magnetic Nanoparticles As Nanocarriersmentioning

confidence: 99%

Micro‐ and Nanocarriers for Immobilization of Enzymes

Leitgeb¹,

Knez²,

Vasić³

2016

Micro and Nanotechnologies for Biotechnology

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Two types of micro-and nanocarriers for immobilization of enzymes for biotechnological and biomedical applications are described: magnetic nanoparticles and crosslinked enzyme aggregates (CLEAs). Nanosized structures with their large surface and smaller size volume ratio, which is dependent on their strong magnetic dipole, give key features that make magnetic nanoparticles useful in many biotechnological and biomedical applications. They are therefore used as carriers to which different active substances can bind. The preparation of the magnetic nanoparticles, possible surface coating methods, and functionalization with different materials are described. Enzyme immobilization methods, such as adsorption, affinity binding, chelation, or metal binding or covalent binding, enable the preparation of efficient and stable enzyme bound to magnetic nanoparticles. Such a product may be used among bioreactor applications for targeted drug delivery in biosensors or bioimaging and magnetic resonance imaging. Preparation of CLEAs, the microsized enzyme structures without a carrier, is described as well. Their main advantage is very simple preparation, where two steps, precipitation of the enzyme and cross-linking, are joined. A broad spectrum of enzymes for CLEA preparation has been used and many biotechnological reactions are catalyzed. The improvement in CLEA preparation to enhance their stability and operability is also shown.

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Nickel nanoparticles with hcp structure: Preparation, deposition as thin films and application as electrochemical sensor

Cited by 38 publications

References 31 publications

Sol-gel synthesis of thorn-like ZnO nanoparticles endorsing mechanical stirring effect and their antimicrobial activities: Potential role as nano-antibiotics

Sol-gel synthesis of thorn-like ZnO nanoparticles endorsing mechanical stirring effect and their antimicrobial activities: Potential role as nano-antibiotics

One material, multiple functions: graphene/Ni(OH)2 thin films applied in batteries, electrochromism and sensors

Micro‐ and Nanocarriers for Immobilization of Enzymes

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