CUED Publications database

Light-enhanced liquid-phase exfoliation and current photoswitching in graphene-azobenzene composites.

Döbbelin, M and Ciesielski, A and Haar, S and Osella, S and Bruna, M and Minoia, A and Grisanti, L and Mosciatti, T and Richard, F and Prasetyanto, EA and De Cola, L and Palermo, V and Mazzaro, R and Morandi, V and Lazzaroni, R and Ferrari, AC and Beljonne, D and Samorì, P (2016) Light-enhanced liquid-phase exfoliation and current photoswitching in graphene-azobenzene composites. Nat Commun, 7. 11090-.

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Abstract

Multifunctional materials can be engineered by combining multiple chemical components, each conferring a well-defined function to the ensemble. Graphene is at the centre of an ever-growing research effort due to its combination of unique properties. Here we show that the large conformational change associated with the trans-cis photochemical isomerization of alkyl-substituted azobenzenes can be used to improve the efficiency of liquid-phase exfoliation of graphite, with the photochromic molecules acting as dispersion-stabilizing agents. We also demonstrate reversible photo-modulated current in two-terminal devices based on graphene-azobenzene composites. We assign this tuneable electrical characteristics to the intercalation of the azobenzene between adjacent graphene layers and the resulting increase in the interlayer distance on (photo)switching from the linear trans-form to the bulky cis-form of the photochromes. These findings pave the way to the development of new optically controlled memories for light-assisted programming and high-sensitive photosensors.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:11
Last Modified: 16 Nov 2017 02:10
DOI: