PEDOT:PSS/AuNPs/CA modified screen-printed carbon based disposable electrochemical sensor for sensitive and selective determination of carmine

Publication date: Available online 20 July 2018Source: Journal of Electroanalytical ChemistryAuthor(s): Xiaoyu Zhao, Jianhua Ding, Wenlong Bai, Yanfei Wang, Yujia Yan, Yan Cheng, Juankun ZhangAbstractA PEDOT:PSS/AuNPs/CA modified screen-printed carbon based disposable electrochemical sensor for sensitive and selective determination of carmine was studied. Enhanced electrode conductivity was achieved via a 3-step process: (i) construction of a conductive polymer (PEDOT: PSS) on a disposable screen-printed carbon electrode (SPCE) (ii) electropolymerization with gold nanoparticles (AuNPs) and (iii) modification with positively charged β-mercaptoethylamine (CA) in acidic solution using an AuS bond. The prepared nanomaterials were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectrum analysis (EDX). The properties of the resulting sensor were examined by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). Experimental parameters associated with optimal detection conditions such as modes of electrode modification, ratio of PEDOT:PSS, pH of electrolyte, number of turns used for AuNPs polymerization, and CA concentrations were evaluated. The data revealed that the prepared sensor had a low detection limit (6.05 × 10−9 mol/L) and could achieve linearity over a wide range of concentration (9.0 × 10−9 to 3.9 × 10−6 mol/L), thereby meeting the requirements for analysi...
Source: Journal of Electroanalytical Chemistry - Category: Chemistry Source Type: research