Synergistic Effect of Polyoxometalate and Single Walled Carbon Nanotubes on Peroxidase-like Mimics and Highly Sensitive Electrochemical Detection of Hydrogen Peroxide

A novel Keggin-type metatungstate hybrid POMs ((APy)(6)[H2W12O40])/carboxylic acid functionalized single-walled carbon nanotube based amperometric sensing platform was successfully constructed for the sensitive detection of hydrogen peroxide. A simple and reliable procedure was implemented for the synthesis of new composite materials obtained by the covalent grafting of (APy)(6)[H2W12O40] onto the surface of (SWCNT-COOH). The synergistic effect of single walled carbon nanotubes on the electrochemical behavior of (APy)(6)[H2W12O40] was evidenced through the increase of the oxidation and reduction peaks of the polyoxometalate. The sensitivity of hydrogen peroxide detection was increased by a factor of 38.5 in presence of SWCNTs, showing their high influence on peroxidase-like mimics of (APy)(6)[H2W12O40]. The detection limit, the response time, the repeatability and the shelf lifetime were respectively 0.4 mu M, 10 s, <4%, 60 days.