A novel method that allows the determination of the electrical potential of a polymer surface has been applied for polypropylene film treated by N 2 + H2 cold plasma. The plasma treatment results in formation on the film surface of NH2 groups, which then gets transformed to NH3+ in contact with an electrolyte and leads to the formation of an electrical double layer. The method consists of theoretical calculation of electrical model potential, using the measurement of the electrical capacitance of the film in contact with an electrolyte by dielectric spectroscopy. Comparison with the results obtained by theoretical model shows similar dependencies of the electrical potential as a function of amino-groups density and electrolyte concentration, but systematic differences of absolute values are observed. Copyright ? 2005 John Wiley & Sons, Ltd.
Relation:
Surface and Interface Analysis 37 (9) , pp. 737-742
