Ultrafast responsive and highly sensitive enzyme-free glucose sensor based on a novel Ni(OH)2@PEDOT-rGO nanocomposite

The novel nanocomposite of Ni(OH)(2) nanoparticles over reduced graphene oxide and poly (3,4ethylenedioxythiophene) hybrid film (Ni(OH)(2)@PEDOT-rGO) have been successfully fabricated via a facile, scalable and easy-to-control electrodeposition method. The characterization results of scanning electron microscope (SEM) and electrochemical techniques show that Ni(OH)(2) nanoparticles with an average particle size about 10 nm are uniformly deposited on PEDOT-rGO hybrid film with rough surface and reveal outstanding performance for detecting glucose. The enzyme-free glucose sensor exhibits an ultrafast response time (< 1 s), a wide linear range (0.002-7.1 mM), a low detection limit (0.6 mu M) and a high sensitivity (346 mu A mM(-1) cm(-2)). Moreover, the sensor also displays superb selectivity, excellent reproducibility and good stability. The outstanding properties of the sensor may be attributed to the synergistic effect of Ni(OH)(2) nanoparticles possessing high electro-catalysis activity and PEDOT-rGO having well conductivity. More importantly, the sensor was successfully used to determine glucose in the real samples. In addition, the mechanism of electrodeposited PEDOT-rGO and glucose oxidase was investigated. (C) 2017 Elsevier B.V. All rights reserved.