Effect of Silver Nanoparticles on the Dielectric Properties and the Homogeneity of Plasma Poly(acrylic acid) Thin Films

Abstract

For the first time, structure−electrochemical relationships of thin films of a plasma-polymerized acrylic acid/carbon dioxide AA/ CO 2 (75/25%) copolymer modified by implanted silver nanoparticles are discussed. The pulsed plasma polymerization of AA/CO 2 was utilized and adjusted to obtain a maximal amount of COOH groups forming an almost uncross-linked polymer structure. The prepared polymer layer is rinsed by a silver nitrate solution to impregnate Ag + ions. This step is followed by its reduction of Ag + with NaBH 4 as a chemical route in comparison to the reduction by sunlight as an ecofriendly photoreduction method. The chemical composition and morphology of the topmost surface layer of the AA/CO 2 polymer thin film were investigated by X-ray photoelectron spectroscopy and atomic force microscopy. Moreover, the molecular mobility, conductivity, and thermal stability of the polymer layer were analyzed using broadband dielectric spectroscopy. The dielectric properties of the AA/ CO 2 polymer thin film were studied in the presence of Ag + ions or Ag 0 . It was found that a cross-linked polymer layer with a smooth surface and high conductivity was obtained in the presence of Ag + / Ag 0 .

Impact of Starch Coating Embedded with Silver Nanoparticles on Strawberry Storage Time

“…The efficiency of silver nanoparticles (AgNPs) against a variety of microorganisms has been previously established [ 13 ]. AgNPs were prepared using chemical or physical methods [ 14 ]. For decades, AgNPs have been categorized as additives and food contact materials for consumer products [ 15 ].…”

Waterborne nano-emulsions of polyvinyl acetate-polyurethane coatings containing different types of vinyl monomers: synthesis and characterization

“…Similarly, the 1718 cm −1 peak owing to C = O bond of ester group for the former was shifted to a lower frequency, i.e. 1660 cm −1 , compared to that for the latter (Fahmy et al , 2020). The bands observed at 1783, and 1800 cm −1 were attributed to the C = O stretching vibration of the ester groups.…”

Graphene Oxide/Polyvinyl Alcohol–Formaldehyde Composite Loaded by Pb Ions: Structure and Electrochemical Performance

“…The C1s XPS spectra for PVF material (see Figure S1a ) were separated into three contributions related to carbon atoms having different oxidation states due to the following functional groups containing oxygen: (1) nonoxygenated C-C bonds at a binding energy of 284.6 eV, (2) C-O bonds (binding energy of 286.3 eV) and (3) C=O bonds (binding energy of 287.5 eV) [ 37 ].…”