Potential control, thin organic films

Epi-fluorescence Microscopy Studies of Potential Controlled Changes in Adsorbed Thin Organic Films at Electrode Surfaces" ... 

So far, the enormous potential of the diblock copolymer approach has been demonstrated which is based on three particular contributions (i) self-organization of block copolymers with periodicities down to a few ten nanometers, (ii) easy application of structurally well controlled thin films over large areas of various substrates, and (iii) the highly selective etching contrast which can be achieved by the incorporation of suitable inorganic components. Most importantly, the latter will allow to prepare nanostructures in semiconductors with an aspect ratio not yet conceivable by other parallel processing methods. 

Fig. 11 shows the photoswitching of the injection current. Upon UV irradiation, the hole injection current increased, while decreasing to zero on irradiation with visible light. Very thin amorphous diarylethene film as thin as 0.2 pm could also control the hole injection to the organic hole transport layer (Fig. 9b). These results are potentially applicable to optical memory-type organic photoconductors.

Our previous work with PPNVP and GOx-PPNVP/PEUU (6,12,25), which focused on characterization of the surface modified thin films, has demonstrated that a reasonable amount of control can be exerted over the chemistry of plasma modification. The techniques used here to attach active GOx to PEUU may be applied to a wide variety of biomolecules and a wide variety of organic and inorganic substrates. Incorporation of GOx-PPNVP/PEUU into the thin-layer cells extended the potential applicability of GOx-PPNVP/PEUU and similar materials to specific practical applications such as sensing devices. Similarly, the ease of fabrication of the thin-layer cells and the wide variety of electrochemical techniques which are available for use with thin-layer cells warrant further development of this system. 

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