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

Abstract

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.

Electrochemical Sensors based on Conductive Polymers Incorporate of Nano Material for the Detection of Hydrogen Peroxide (H2O2)

“…The okra plant was sourced from local markets, while the additive silver nanoparticles were prepared in a laboratory (at particle size 30 nm). (21) An integrated sensor, specified with dimensions (10 * 10 * 0,635 mm), working temperature range of -50℃ to 500℃, and constructed with key materials like alumina ceramics and gold, was acquired from CHANGCHUN MEGA BORUI TECHNOLOGY CO., LTD. in China. The main parameters of the sensor include an electrode spacing of (0,09 mm), electrode width of (0,08 mm), carbon film thickness ranging from (9 to 11 μm), and a total of 15 electrode pairs.…”

Test the Optical and Structural Characteristics of Nano PbO Produced by Plasma–jet Technique

“…After that, a pencil got its name [10], which is now used, although the material currently used is graphite. The lead voltage value is (0.13 V) [11], it is an anti-magnetic metal that is ductile and malleable [12], and it also has corrosion resistance due to passivation [13]. The nanoparticles of PbO have a spherical shape [14].…”

Influences of Plasma Plume Length on Structural, Optical and Dye Degradation Properties of Citrate-Stabilized Silver Nanoparticles Synthesized by Plasma-Assisted Reduction

“…To create silver nanoparticles, it is necessary to add chemical reducing agents to silver salt ions and reduce silver ions in boiling water. In addition, stabilizers such as citrate [ 16 ], polyvinyl alcohol [ 17 ], polyvinyl pyrrolidone [ 6 ], bovine serum albumin [ 18 ], and cellulose [ 19 ] are extensively used to avoid aggregation of nanoparticles.…”