Continuous Electrochemical Detection of Gold Nanoparticles in Flow

Abstract

Nanoparticles have already found numerous applications and their global production is still increasing. Therefore, the engineered nanoobjects of uncertain toxicity become ubiquitous in the environment and a continuous monitoring of their presence is highly desirable. Here, we demonstrate a continuous electrochemical detection of gold nanoparticles (AuNPs) based on synchronous processes of their electrodissolution and electrocatalysis. This approach is realized by the injection of nanoparticles suspension into the Flow Injection Analysis (FIA) system. The modular structure of FIA system is particularly applicable for carrying out of sequential operations: AuNPs passivation, oxidation of aqueous SO2 and gold. It enables continuous, fast and reproducible gold nanoparticles determination in a wide concentration range: 10−10– 10−7 mol nanoobjects L−1.

Electrochemical Detection of Positively Charged Carbon Nanoparticles Suspension in Flow

“…It was concluded, that adsorption of catalytic nanoparticles provides suitable conditions for discrimination of the faradaic from capacitive current. Electrochemical detection of gold nanoparticles in flow based on more complex reaction path including electrocatalytic reaction was also reported . Electrochemical detection of Ag nanoparticles in flow based on their electrodissolution was also examined .…”

Electrochemical Detection of Gallic Acid-Capped Gold Nanoparticles Using a Multiwalled Carbon Nanotube-Reduced Graphene Oxide Nanocomposite Electrode

“…Electrochemical techniques are particularly well suited for the detection and characterization of polyphenol-capped AuNPs, in this case, GA-AuNPs. Electrochemical sensors for the direct detection of AuNPs using the oxidation, reduction, and electrocatalytic signal of gold have previously been reported. − Electrochemical techniques offer several advantages, including high sensitivity, high selectivity, rapid measurements, cost-effectiveness, and ease of use. The modification of electrode surfaces with nanomaterials, polymer films, , nanoparticles, , nanocomposites, − and self-assembled monolayers − (SAMs) is a popular approach to improving the performance of electrochemical sensors.…”