%0 Journal Article
%T Spontaneous Deposition of Prussian Blue on Multi-Walled Carbon Nanotubes and the Application in an Amperometric Biosensor
%A Yanli Yao
%A Xiaoyun Bai
%A Kwok-Keung Shiu
%J Nanomaterials
%D 2012
%I MDPI AG
%R 10.3390/nano2040428
%X A simple method has been developed for the spontaneous deposition of Prussian blue (PB) particles from a solution containing only ferricyanide ions onto conducting substrates such as indium tin oxide glass, glassy carbon disk and carbon nanotube (CNT) materials. Formation of PB deposits was confirmed by ultraviolet-visible absorption spectrometry and electrochemical techniques. The surface morphology of the PB particles deposited on the substrates was examined by atomic force microscopy and scanning electron microscopy. CNT/PB composite modified glassy carbon electrodes exhibited an electrocatalytic property for hydrogen peroxide reduction. These modified electrodes exhibited a high sensitivity for electrocatalytic reduction of hydrogen peroxide at £¿0.05 V ( vs. Ag|AgCl), probably due to the synergistic effect of CNT with PB. Then, CNT/PB modified electrodes were further developed as amperometric glucose biosensors. These biosensors offered a linear response to glucose concentration from 0.1 to 0.9 mM with good selectivity, high sensitivity of 0.102 A M £¿ 1 cm £¿2 and short response time (within 2 s) at a negative operation potential of £¿0.05 V ( vs. Ag|AgCl). The detection limit was estimated to be 0.01 mM at a signal-to-noise ratio of 3.
%K Prussian blue
%K spontaneous deposition
%K carbon nanotubes
%K glucose determination
%U http://www.mdpi.com/2079-4991/2/4/428