Optical Input/Electrical Output Memory Elements based on a Liquid Crystalline Azobenzene Polymer

MOSCIATTI, Thomas, BONACCHI, Sara, GOBBI, Marco, FERLAUTO, Laura, LISCIO, Fabiola, GIORGINI, Loris, ORGIU, Emanuele et SAMORI, Paolo, sans date. Optical Input/Electrical Output Memory Elements based on a Liquid Crystalline Azobenzene Polymer. ACS Applied Materials & Interfaces [en ligne]. sans date. Vol. 8, n° 10pp. 6563-6569. [Consultésans date]. DOI 10.1021/acsami.5b12430. Consulté de : http://pubs.acs.org/doi/abs/10.1021/acsami.5b12430Responsive 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, the device can be set in a high- or low-resistance state by light irradiation at different wavelengths. This result paves the way toward the potential use of poly(metha)acrylate/azobenzene polymer films as active layer for optical input/electrical output memory elements.1. .
Accès libre Peer reviewed
Version acceptée pour publication (post-print auteur)
Paternité - Pas d'utilisation commerciale [CC] [BY] [NC]
Auteurs Thomas Mosciatti
Sara Bonacchi
Marco Gobbi
Laura Ferlauto
Fabiola Liscio
Loris Giorgini
Emanuele Orgiu
Paolo Samori
Unité de recherche du site

Institut de Science et d'Ingénierie Supramoléculaires - ISIS - UMR7006
URL éditeur http://pubs.acs.org/doi/abs/10.1021/acsami.5b12430
Langue

en
Volume

8
Numéro

10
Page de début

6563
Page de fin

6569
Date de première publication

2016-02-18
ISSN

1944-8244
1944-8252
Titre de la source (revue, livre…)

ACS Applied Materials & Interfaces
Résumé

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
Show moreResponsive 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, the device can be set in a high- or low-resistance state by light irradiation at different wavelengths. This result paves the way toward the potential use of poly(metha)acrylate/azobenzene polymer films as active layer for optical input/electrical output memory elements.
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DOI 10.1021/acsami.5b12430
Titre abrégé de la source

ACS Appl. Mater. Interfaces
Type de publication

ACL
Domaine

Chimie/Matériaux
Mots-clés

azobenzene
memory device
multifunctional device
photochromic polymers
polymeric liquid crystals
Unité de recherche extérieure au site

Istituto per la Microelettronica e Microsistemi (IMM)-CNR, via Piero Gobetti 101, 40129 Bologna, Italy
Dipartimento di Chimica Industriale “Toso Montanari”, Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
Fonction

aut
crp
Audience

International