Preparation of Silver Nanoparticles by Arc Plasma Method and Their Properties

Mineta, Takahiro; Saito, Tatsuya; Yoshihara, Toshio; Satō, Hiroyuki

doi:10.2320/matertrans.m2018391

Cited by 4 publications

(2 citation statements)

References 20 publications

(13 reference statements)

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“…According to the ISO standards, it is recommended to opt for technology with fewer reagents, "green" and more environmentally friendly resources. e preparation of the metal nanoparticles with the help of a green chemistry method must be evaluated under three specific aspects: the choice of nontoxic solvent, an environmentally friendly reducing agent, and a biodegradable stabilizing agent [10,11]. e method of obtaining silver nanoparticles under the action of plasma discharge corresponds to all three of them [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Silver Nanoparticles in a Plasma-Liquid System in the Presence of PVA: Antimicrobial, Catalytic, and Sensing Properties

Скіба

Vorobyova

Kosogina

2020

Journal of Chemistry

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The preparation of stabilized silver nanodispersions under the action of short-term plasma discharge using a polyvinyl alcohol stabilizer (polyvinyl alcohol (PVA)) was investigated. The influence of the basic technological parameters such as initial Ag+ concentration, PVA concentration, and process duration on the formation of nanoparticles and their characteristics (size and stability) were determined. The UV-Vis spectra showed the localized surface plasmon resonance at wavelengths of 400–420 nm. The SEM images showed that the shape of Ag NPs is spherical with an average particle size up to 30 nm. Ag NPs were used as a catalyst for the reduction of 4-nitrophenol (4-NP). The effect of the concentration of PNP and catalyst dosage on the value of apparent rate constant (kapp) for catalytic reduction of 4-NP in the presence of Ag NPs was investigated by means of UV-Vis spectrophotometry. The antimicrobial activity of Ag nanoparticles was investigated against yeast and Escherichia coli. The colorimetric sensor studies of plasma synthesized Ag NPs showed selective sensing of the potentially hazardous Hg2+ ion in water.

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Section: Introductionmentioning

confidence: 99%

Preparation of Silver Nanoparticles in a Plasma-Liquid System in the Presence of PVA: Antimicrobial, Catalytic, and Sensing Properties

Скіба

Vorobyova

Kosogina

2020

Journal of Chemistry

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“…Several reports are available on thermal plasma-assisted controlled production of silver nanomaterials [13][14][15][16]. Thermal plasma techniques in general have the advantage of being able to be easily scaled up for a higher rate of production [17,18].…”

Section: Introductionmentioning

confidence: 99%

Single-step, DC thermal plasma-assisted synthesis of Ag-C nanocomposites with less than 10 nm sizes for antibacterial applications

Sabavath¹,

Rahman²,

Sarmah³

et al. 2020

J. Phys. D: Appl. Phys.

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A single-step, thermal plasma-assisted technique is reported for size-controlled synthesis of silver-carbon (Ag-C) nanocomposites, to be used for antibacterial applications. Silver nanoparticles of sizes less than 10 nm can directly penetrate into the core of the bacteria, while stiff, nanocrystalline carbon may rupture the microorganisms with their sharp edges. Experiments demonstrated that silver nanoparticles nucleate anchoring tightly on carbon sheets, which can inhibit their aggregation and growth in size and becomes more effective as crystallinity of the carbon enhances further. Nanocomposite samples were synthesized using a hot graphite nozzle and with variation of ambient pressure in the sample collection chamber. The Ag-C sample synthesized at 190 mbar chamber pressure demonstrated the best antibacterial activities. The zone of inhibition was measured for this sample as 18 mm for the gram-positive E. hirae and 15 mm for the gram-negative E. coli bacteria at their corresponding minimum inhibitory values of 0.54 mg ml−1 and 0.9 mg ml−1 respectively. The crystallinity of the carbon nanosheets was measured to be the best for this particular sample and the average size of the silver nanoparticles remaining entangled on them was measured as 4.6 nm, which to our knowledge is the smallest ever synthesized by a plasma-assisted method. The gas temperature at the injection section was measured using the C2 Swan band system, (0, 0) vibrational transition located at 516.5 nm, which confirms temperature enhanced substantially in presence of the graphite nozzle, which had led to the enhanced material crystallinity and synthesis of particles with the smallest sizes.

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Structure and mechanical properties of nanocrystalline silver prepared by spark plasma sintering

Mineta¹,

Saito²,

Yoshihara³

et al. 2019

Materials Science and Engineering: A

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Preparation of Silver Nanoparticles by Arc Plasma Method and Their Properties

Cited by 4 publications

References 20 publications

Preparation of Silver Nanoparticles in a Plasma-Liquid System in the Presence of PVA: Antimicrobial, Catalytic, and Sensing Properties

Preparation of Silver Nanoparticles in a Plasma-Liquid System in the Presence of PVA: Antimicrobial, Catalytic, and Sensing Properties

Single-step, DC thermal plasma-assisted synthesis of Ag-C nanocomposites with less than 10 nm sizes for antibacterial applications

Structure and mechanical properties of nanocrystalline silver prepared by spark plasma sintering

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