Impact of Weak Organic Acids on Precipitation of Poly(acrylic acid) Stabilized Silver Nanoparticles; an Electrochemical Approach

Abstract

Owing to recent developments in the field of silver nanoparticle (AgNP) based conductive inks for inkjet printing, there is a growing demand for implementation of novel synthetic routes. This study presents a synthesis of silver colloid with an average particle diameter of less than 3 nm. AgNPs were obtained by a chemical reduction method, using hydrazine as a reducing agent, and poly(acrylic acid), (PAA), as a grainstabilizing agent. Synthesis was provided using highly concentrated aqueous solutions. To obtain PAA-coated silver nanopowder, weak organic acids were introduced as precipitation agents. The main goal of this work was to study the impact of various organic precipitants on nanosurface-adsorbed polyacid for enhanced ink stability, by implementing electrochemical techniques. Cyclic voltammetry and electrochemical impedance spectroscopy were the main methods in describing all steps of the procedure -from preliminary experiments to whole system characterization. For a comprehensive study of the nanoink suspension, dynamic light scattering (DLS) and electrokinetic potential measurements were carried out. The obtained results show, through a very apparent decrement in anodic current responses, the influence of different organic acid precipitants on nanoink destabilization.

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Recent Advances in (Bio)Chemical Sensors for Food Safety and Quality Based on Silver Nanomaterials

“…Furthermore, crystalline nanosilver product can also be obtained by implementing precipitation agents ( 35 , 47 ). Recently, we have shown that weak organic acids ( 48 ), as well as strong mineral acids ( 49 ), can be successfully applied to precipitate polyacid-stabilised nanosilver grains as the functional component of printable conductive inks.…”

Fabrication of an All-Solid-State Ammonium Paper Electrode Using a Graphite-Polyvinyl Butyral Transducer Layer

“…Cyclic voltammetry is a common and often the first electroanalytical technique of choice to obtain preliminary information about electrochemical reactions [30,31]. The reversible behaviour of the ferricyanide/ferrocyanide redox-couple was observed at the bare graphite electrode, with a pronounced anodic maximum at 302.7 mV, as well as a cathodic current trough at 143.4 mV (Figure 3a).…”