Graphene electrochemical responses sense surroundings

Graphite oxide (GO) paper, obtained by direct filtration of exfoliated GO in water over FTFE membrane filters, was reduced by using hydrazine vapours. The graphene-paper thus obtained was characterized by the combination of different techniques. The electrochemical characterization by cyclic voltammetry, chronoamperometry and chronopotentiometry presents a strong influence of the working conditions: temperature, electrolyte concentration and current on the electrochemical responses, indicating a good ability of the material to sense ambient and working conditions. Electrochemical devices based on graphene are expected to work as dual, and simultaneous, sensing-actuators. (c) 2012 Elsevier Ltd. All rights reserved.