Investigation of the patterning of a lyotropic mixture onto silver paste electrodes via ink jet printing and its effect on the electroreduction of hydrogen peroxide
Piano, M., Gonzalez-Macia, L. and Killard, A. (2012) Investigation of the patterning of a lyotropic mixture onto silver paste electrodes via ink jet printing and its effect on the electroreduction of hydrogen peroxide. In: Electrochem 2012, Dublin, Ireland, 2th - 4th Septemberm, 2012.
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Detection of hydrogen peroxide is widely used in a range of applications, from pharmaceutical to clinical and food industry, as well as environmental analysis. Peroxide is generated during many biological reactions and its concentration can be stoichiometrically related to the concentration of the analyte of interest. Recent work has demonstrated that enhanced electrocatalytic reduction of hydrogen peroxide has been observed at silver paste electrodes when modified with solution of dodecylbenzene sulphonic acid (DBSA)/KCl which brings about modification of the surface with a liquid crystal-like lyotropic layer.Ref However, modification of the surface also leads to the enhancement of the double layer capacitance. These layers have also been deposited using inkjet printing.Ref Microelectodes are widely used in electrochemical analysis due to their reduced ohmic drop and charging current. These characteristics allow for lower detection limits and greater sensitivities in comparison to macroelectrodes. To overcome the disadvantage of the very small currents generated, microelectrode arrays are employed which have increased faradic currents while still having low charging currents. In this study, we evaluate the effect of patterning of the DBSA/KCl solution onto the electrode using ink jet printing. The parameters of spot size, spot volume and spot spacing were investigated across the range of drop spacings from 20 µm to 250 µm. The array structures were characterised using cyclic voltammetry and amperometry in the presence of hydrogen peroxide and in comparison with unmodified electrodes and electrodes completely covered with DBSA/KCl. Scan rate studies and determination of signal to noise were used to determine whether patterning was capable of enhancing the limit of detection of the electrode to hydrogen peroxide. References: Gonzalez-Macia, L., Smyth, M. and Killard, A. (2012)A printed electrocatalyst for hydrogen peroxide reduction.Electroanalyisis, 24 (3). pp. 609-614. ISSN 1521-4109, Gonzalez-Macia, L., Smyth, M., Morrin, A. and Killard, A. (2011)Enhanced electrochemical reduction of hydrogen peroxide on silver paste electrodes modified with surfactant and salt.Electrochimica Acta, 56 (11). pp. 4146-4153. ISSN 0013-4686