Preparation of Cobalt Nanoparticles

Khusnuriyalova, Aliya F.; Caporali, Maria; Hey‐Hawkins, Evamarie; Sinyáshin, O. G.; Yakhvarov, Dmitry G.

doi:10.1002/ejic.202100367

Cited by 33 publications

(8 citation statements)

References 277 publications

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“…Cobalt nanoparticles have its diffraction peaks at 2θ of 44.7° (1 1 1), 52.0° (2 0 0), and 76.3° (2 2 0), which correspond to the face-centered cubic (FCC) crystal structure of pure CoNPs. The diffraction peaks observed exhibit a resemblance to those documented in the literature for CoNPs (Khusnuriyalova et al 2021;Shi et al 2021;Cruz et al 2019b), thereby confirming the accomplished synthesis of pure CoNPs in the FCC structure. The diffraction peaks of NiNPs can be observed at 2θ which is equal to 44.5° (1 1 1), 51.9° (2 0 0), and 76.5°…”

Section: X-ray Diffraction Analysissupporting

confidence: 83%

Spectroscopic and antibacterial activities of cobalt and nickel nanoparticles: a comparative analysis

Balogun,

Abolarinwa,

Adesanya

et al. 2024

J Anal Sci Technol

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This study aimed to compare the spectroscopy, morphological, electrocatalytic properties, and antibacterial activities of cobalt nanoparticles (CoNPs) with nickel nanoparticles (NiNPs). Cobalt nanoparticles and NiNPs were prepared via a chemical reduction approach and characterized utilizing transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), and X-ray diffraction (XRD) techniques. The result from XRD and TEM analysis revealed that the synthesized nanoparticles exhibit face-centered cubic with smooth spherical shape, having average particles size of 12 nm (NiNPs) and 18 nm (CoNPs). The electrochemical properties of the nanoparticles were examined via cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques. The CV results showed that GCE-Ni (35.6 μA) has a higher current response compared to GCE-Co (10.5 μA). The EIS analysis revealed that GCE-Ni (1.39 KΩ) has faster electron transport capability compared to GCE-Co (2.99 KΩ) as indicated in their Rct values. The power density of the synthesized nanoparticles was obtained from their "knee" frequency (f°) values, with GCE-Ni (3.16 Hz) having higher f° values compared to GCE-Co (2.00 Hz). The antibacterial activity of the nanoparticles was evaluated against multidrug-resistant Escherichia coli O157, Escherichia coli O177, Salmonella enterica, Staphylococcus aureus, and Vibrio cholerae. The result from the antibacterial study revealed that at low concentrations both CoNPs and NiNPs have significant antibacterial activities against E. coli O157, E. coli O177, S. enterica, S. aureus, and V. cholerae. NiNPs showed better antibacterial activities at low concentrations of 61.5, 61.5, 125, 61.5, and 125 µg/mL compared to CoNPs with minimum inhibitory concentrations of 125, 125, 250, 61.5, and 125 µg/mL against E. coli O157, E. coli O177, S. enterica, S. aureus, and V. cholerae, respectively. These promising antibacterial activities emphasize the potential of CoNPs and NiNPs as effective antibacterial agents, which could aid in the development of novel antibacterial medicines.

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Section: X-ray Diffraction Analysissupporting

confidence: 83%

Spectroscopic and antibacterial activities of cobalt and nickel nanoparticles: a comparative analysis

Balogun,

Abolarinwa,

Adesanya

et al. 2024

J Anal Sci Technol

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“…The above equation can be interrupted as the following Eqs. ( 8 , 9 and 10 ): where ε s is the specific absorptivity and its value in µg/cm corresponds to the determinant in a cuvette with an optical length of 1 cm, ε is the molar absorptivity, C is the molar concentration of the determinant, and d is path length (1 cm) [ 128 ] .…”

Section: Resultsmentioning

confidence: 99%

Green synthesis of silver nanoparticles and its environmental sensor ability to some heavy metals

Ibrahim,

Taha,

Hagaggi

et al. 2024

BMC Chemistry

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This study marks a pioneering effort in utilizing Vachellia tortilis subsp. raddiana (Savi) Kyal. & Boatwr., (commonly known as acacia raddiana) leaves as both a reducing and stabilizing agent in the green “eco-friendly” synthesis of silver nanoparticles (AgNPs). The research aimed to optimize the AgNPs synthesis process by investigating the influence of pH, temperature, extract volume, and contact time on both the reaction rate and the resulting AgNPs' morphology as well as discuss the potential of AgNPs in detecting some heavy metals. Various characterization methods, such as UV–vis spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), Zeta sizer, EDAX, and transmitting electron microscopy (TEM), were used to thoroughly analyze the properties of the synthesized AgNPs. The XRD results verified the successful production of AgNPs with a crystallite size between 20 to 30 nm. SEM and TEM analyses revealed that the AgNPs are primarily spherical and rod-shaped, with sizes ranging from 8 to 41 nm. Significantly, the synthesis rate of AgNPs was notably higher in basic conditions (pH 10) at 70 °C. These results underscore the effectiveness of acacia raddiana as a source for sustainable AgNPs synthesis. The study also examined the AgNPs' ability to detect various heavy metal ions colorimetrically, including Hg2+, Cu2+, Pb2+, and Co2+. UV–Vis spectroscopy proved useful for this purpose. The color of AgNPs shifts from brownish-yellow to pale yellow, colorless, pale red, and reddish yellow when detecting Cu2+, Hg2+, Co2+, and Pb2+ ions, respectively. This change results in an alteration of the AgNPs' absorbance band, vanishing with Hg2+ and shifting from 423 to 352 nm, 438 nm, and 429 nm for Cu2+, Co2+, and Pb2+ ions, respectively. The AgNPs showed high sensitivity, with detection limits of 1.322 × 10–5 M, 1.37 × 10–7 M, 1.63 × 10–5 M, and 1.34 × 10–4 M for Hg2+, Cu2+, Pb2+, and Co2+, respectively. This study highlights the potential of using acacia raddiana for the eco-friendly synthesis of AgNPs and their effectiveness as environmental sensors for heavy metals, showcasing strong capabilities in colorimetric detection.

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“…It should be noted that this method is a multi-stage process and requires high costs, both economic and time. In addition, laser irradiation, magnetron sputtering, γ-radiolysis, and other methods can be noted; see details in recent review [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

A New Approach to the Synthesis of Nanocrystalline Cobalt Boride in the Course of the Thermal Decomposition of Cobalt Complexes [Co(DMF)6]2+ with Boron Cluster Anions

et al. 2023

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In the course of the study, nanocrystalline cobalt monoboride was prepared by thermal decomposition of precursors [Co(DMF)6][An], where [An] = [B12H12]2– (1), [trans-B20H18]2– (2) or [B10Cl10]2– (3) in an argon atmosphere. Three new salt-like compounds 1–3 were prepared when Co(NO3)2 was allowed to react with (Et3NH)2[An]. Compound 1 is new; the structures of compounds 2 and 3 have been previously reported. Samples 1–3 were annealed at 900 °C in argon to form samples 1a–3a, which were characterized by single crystal XRD for 1 and powder XRD for 1–3. Powder XRD on the products showed the formation of BN and CoB for 1a in a 1:1 ratio; 2a gave a higher CoB:BN ratio but an overall decreased crystallinity. For 3a, only CoB was found. IR spectra of samples 1a–3a as well as X-ray spectral fluorescence analysis for 3a confirmed these results. The nanoparticular character of the decomposition products 1a–3a was shown using TEM; quite small particle sizes of about 10–15 nm and a quite normal size distribution were found for 1a and 2a, while the decomposition of 3 gave large particles with 200–350 nm and a broad distribution.

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Preparation of Cobalt Nanoparticles

Cited by 33 publications

References 277 publications

Spectroscopic and antibacterial activities of cobalt and nickel nanoparticles: a comparative analysis

Spectroscopic and antibacterial activities of cobalt and nickel nanoparticles: a comparative analysis

Green synthesis of silver nanoparticles and its environmental sensor ability to some heavy metals

A New Approach to the Synthesis of Nanocrystalline Cobalt Boride in the Course of the Thermal Decomposition of Cobalt Complexes [Co(DMF)6]2+ with Boron Cluster Anions

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