Single microparticle applied in magnetic-switchable electrochemistry

In this work we demonstrated the micromanipulation of a single magnetic microparticle (Fe3O4) modified with Prussian blue (PB) for use in magnetic-switchable electrochemistry. A single Fe3O4-PB microparticle with 120 mu m was isolated in an electrochemical microcell (20 mu L), in which a fine control of PB electrochemical process on carbon electrode ((sic)=4.0 mm) was obtained. For cyclic voltammetty, redox processes attributed to PB/PW (Prussian blue/Prussian white) one electron redox couple were observed, however the capacitive currents were very high. On the other hand, by using differential pulse voltammetry, a maximum faradaic current for anodic peak of 200 nA cm(-2) at 0.06 V was observed. Several and high stable chronoamperograms were obtained by switch on and switch off' magnetic commutative states for a single microparticle, showing that the system developed here can be very promising for application in electrochemistry. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.