Figure 3. Fabrication of hybridized release samples.

(a) Spin-coating of a drug-containing PEG film (green) onto the substrate, followed by the hybridization (ZnO-ALD for defining the storage part shown in “yellow”). Subsequent coating with conducting polymer layers (blue) builds the complete release system. (b) Process scheme for fabrication of the primary polymer layer using the vapor phase polymerization. First the oxidizer is applied in a roll-on technique, followed by the polymer formation in a vacuum-chamber. (c) Illustration of the three electrode setup used for the electrochemical deposition of the secondary polymer or for application of the bias potential during the release studies.