Enhanced electropolymerization of poly(xanthurenic acid)-MoS<inf>2</inf>film for specific electrocatalytic detection of guanine and adenine

Key Words:Molybdenum compounds;Cyclic voltammetry - Electropolymerization - Film preparation - High resolution transmission electron microscopy - Layered semiconductors - Nanocomposites - Positive ions - Scanning electron microscopy - Transmission electron microscopy - Ultrasonic applications;Biosensing platforms - Differential pulse voltammetry - Electrocatalytic activity - Electrochemical response - Electrochemical sensing - Modified electrodes - Physical adsorption - Polymer nanocomposite

Abstract:Until now, research studies on the preparation of MoS<inf>2</inf>-based polymer nanocomposites using the electropolymerization method have been scarce. Herein, for the first time, a poly(xanthurenic acid, Xa) film based on a thin-layer MoS<inf>2</inf>support was electrochemically prepared to form a highly electroactive biosensing platform. The thin-layer MoS<inf>2</inf>was obtained using a simple ultrasonic method from bulk MoS<inf>2</inf>. The physical adsorption between MoS<inf>2</inf>and aromatic Xa improved the electropolymerization efficiency, accompanied by an increased electrochemical response of PXa. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), and differential pulse voltammetry (DPV) were utilized to characterize the morphology and investigate the electrochemical properties of the prepared interface. Compared with sole PXa or a MoS<inf>2</inf>modified electrode, the PXa-MoS<inf>2</inf>hybrid interface exhibited good electrocatalytic activity and prominent synergistic effect on guanine and adenine. A PXa-MoS<inf>2</inf>nanocomposite has the negative charge and a specific structure, which obviously prompts the adsorption of the positively charged guanine and adenine. Moreover, this nanocomposite is a promising candidate in electrochemical sensing and other electrocatalytic applications.<br/> &copy; The Royal Society of Chemistry 2015.

Volume:3

Issue:24

Translation or Not:no