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We have demonstrated that the multiple photochemical switching device can be fabricated by successive deposition of two different photochemical switching Langmuir–Blodgett (LB) films consisting of molecules with switching, transmission, and working units, each corresponding to azobenzene derivatives, alkyl chain, and conductive pyridinium (TCNQ)2 complex, respectively. The photoisomerization of switching units causes a change in conductivity of the LB films, which is associated with working units. When molecules with different switching units are used to assemble the device, its conductivity can be controlled by the irradiation with four types of control light.
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Tachibana et al. (1992) studied this question.
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