engleski

Influence of Inorganic Acids during Precipitation on Stabilization of Poly(acrylic acid) coated Silver Nanoparticles

In recent years, silver nanoparticles (AgNPs) have received great attention due to their unique optoelectronic and physicochemical properties resulting in various applications. This study reports a wet chemical synthesis of AgNPs, using hydrazine monohydrate as a reducing agent and poly(acrylic acid) (PAA) as a capping agent. PAA- coated silver nanopowders, precipitated with inorganic acids (perchloric, phosphorous and sulfuric), were used for nano- ink formulations. Characterization of the reaction mixture, as well as of the prepared conductive inks, was performed by cyclic voltammetry and UV-Vis spectroscopy, respectively. PAA adsorbed on the nanoparticle surface behaves as a weak acid. In alkaline media, negative surface charge generated due to the dissociated PAA engenders repulsion forces between nanoparticles. Thus, efficiency of electrostatic stabilization of the prepared suspension depends on the acid dissociation rate. The stability of the formulated nano-inks was tested in a wide range of Britton-Robinson buffer solutions. The highest anodic current responses and maximum absorbance (λ = 419 nm) were plotted versus pH to determine the quantity of surface bound PAA.

silver nanoparticles ; poly(acrylic acid) ; cyclic voltammetry ; inkjet printing

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