Nonenzymatic glucose sensor based on Ag&Pt hollow nanoparticles supported on TiO2 nanotubes

Abstract

This study was dedicated to develop a nonenzymatic glucose sensor based on Ag&Pt hollow nanoparticles supported on TiO₂ nanotubes. The Ag&Pt-TiO₂/(500°C) was synthesized by a simple reduction and galvanic replacement method in an aqueous solution. The surface morphology and structure of Ag&Pt-TiO₂/(500°C) could be examined by transmission electron microscopy, scanning electron microscopy and energy dispersive spectrometer. The mechanical behavior was measured by nanoindentation test and the hydropathy property was measured by contact angle test. It can be observed that Ag&Pt hollow structures with a particle size of 100nm and a wall thickness of 27nm were deposited on TiO₂ nanotubes. The electrochemical properties were investigated by Electrochemical Workstation with three-electrode system. Ag&Pt(6h)-TiO₂/(500°C) electrode exhibited excellent catalytic ability from cyclic voltammetry and fast electron transfer rate according to the electron transfer resistance of 330Ω from impedance spectroscopy. Differential pulse voltammetry results showed the sensitivity to glucose was 3.99μA∗cm^-2∗mM^-1, the linearity increased to 180mM and the detection limit was 22.6μM. The prepared nonenzyme glucose sensor with good analytical performance and simple preparation method looks promising in accurate glucose detection applications.

Keywords: Ag&Pt nanoparticles; Hollow structures; Nonenzymatic glucose sensor; TiO(2) nanotube.