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| - Fabrication of an Interdigitated Array Electrode onZnSe and Its Application to ElectroopticalMeasurements Using FT-IR Spectroscopy
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| - An interdigitated array electrode (IDA) is fabricated onan IR-transparent substrate for use in electroopticalmeasurements using Fourier transform infrared (FT-IR)spectroscopy. The fabrication of the IDA and its uniquesampling geometry for transmission spectroscopy is detailed. The gold IDA was patterned on the ZnSe substrateusing a photolithographically defined liftoff process. AnIR flow cell was modified to enable the substrate containing the IDA to be used for electrooptical measurementsin transmission. The utility of the electrooptical cell isdemonstrated by application to two model systems. In thefirst, changes in the conductivity and spectral features ofa receptor membrane (Nafion) upon dehydration aremeasured. In the second, the measurement of the electric-field-induced orientation of a liquid-crystalline film of 4-n-pentyl-4‘-cyanobiphenyl was conducted in a new experimental geometry, with IR transmission normal to thedirection of the applied electric field. Difference spectroscopy facilitated the observation of the change in orientation of the liquid crystal with applied potential. Thesesystems demonstrate the general utility of the fabricationscheme described here. It also illustrates its facile adaptation to infrared difference spectroscopy as a means ofstudying complex phenomena in electrochemical andelectrooptical systems.
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