Development, characterization and sensing properties of graphene films deposited from platelets mixed with dodecyl benzene sulfonic acid

Films deposited onto glass and flexible substrates from commercially available graphene platelets mixed with dodecyl benzene sulfonic acid are characterized by means of Atomic Force Microscopy (AFM), Raman and DC and AC electrical measurements in dry condition and under moisture, and as a function of temperature. The material, found to be electrochemically active, has been applied on the top of gold electrodes vacuum deposited on flexible substrates, in order to develop electrochemical cells, using nafion as the solid state ion conducting medium. Sensing tests performed in water show that the cells are able to detect the presence of hydrogen peroxide, at concentrations in the micromolar range, with linear response, and in a reversible way.