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Responsive polymer materials can change their properties when subjected to external stimuli. In this work, thin films of thermotropic poly(metha)acrylate/azobenzene polymers are explored as active layer in light-programmable, electrically readable memories. The memory effect is based on the reversible modifications of the film morphology induced by the photoisomerization of azobenzene mesogenic groups. When the film is in the liquid crystalline phase, the trans → cis isomerization induces a major surface reorganization on the mesoscopic scale that is characterized by a reduction in the effective thickness of the film. The film conductivity is measured in vertical two-terminal devices in which the polymer is sandwiched between a Au contact and a liquid compliant E-GaIn drop. We demonstrate that the trans → cis isomerization is accompanied by a reversible 100-fold change in the film conductance. In this way …
American Chemical Society
Publication date: 
16 Mar 2016

Thomas Mosciatti, Sara Bonacchi, Marco Gobbi, Laura Ferlauto, Fabiola Liscio, Loris Giorgini, Emanuele Orgiu, Paolo Samorì

Biblio References: 
Volume: 8 Issue: 10 Pages: 6563-6569
ACS applied materials & interfaces