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Polyaniline is one of the conductive polymers that can be funcionalized as a sensitive layer on quartz crystal microbalance (QCM). The sensitivity of polyaniline can be enhanced via dedicated its morphology. The plasma oxygen treatment is used to modify the surface of polyaniline coating. The purpose of this study was to determine the effect of power variations on plasma treatment on roughness and the surface hydrophobicity properties of polyaniline. Plasma oxygen is generated with a power variation of 24W, 30W and 42W, for 60 second and a flow rate of 50 ml/sec. The oxygen plasma treatment affects the polyaniline surface roughness and hydrophobicity. As the power increases, the roughness of polyaniline was decreases. Simultaneously the polyaniline surface turns into hydrophilic. From FTIR and OES characterization it is observed that there has been an interaction between OI oxygen radical species with polyaniline functional groups on the surface of the coating. This interaction causes the polyaniline surface to be flattened and increase its hydrophilicity. Keywords—oxygen plasma treatment; polyaniline; surface modification; hydrophobicity

The effect of oxygen plasma treatment on the hydrophobicity of polyaniline surface