Integrated optical and electrochemical detection of Cu²⁺ ions in water using a sandwich amino acid-gold nanoparticle-based nano-biosensor consisting of a transparent-conductive platform.

ABSTRACT: In this paper, an optical-electrochemical nano-biosensor was introduced for measuring Cu²⁺ ion concentrations in water. A multi-step procedure was used to fabricate the transparent-conductive biosensor platform consisting of an l-cysteine-gold nanoparticle-based sandwich structure. First, colloidal gold nanoparticles (GNPs) were synthesized according to the Turkevich-Frens method with some modifications and then functionalized with l-cysteine molecules (GNP/l-cys). Then, cyclic voltammetry was preformed in buffered solutions containing HAuCl₄·3H₂O for gold nanoparticle electrodeposition on cleaned ITO glasses. The GNP-electrodeposited ITO glasses (ITO/GNPs) were thermally treated in air atmosphere for 1 hour at a temperature of 300 °C. Following the procedu

SUBMITTER: Atapour M 

PROVIDER: S-EPMC9061878 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature