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Issue 18, 2020
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Azobenzene molecular glasses with tuned glass transition temperatures: from optimal light-induced motion to self-erasable gratings

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Abstract

The rate of photomechanical formation of surface relief gratings (SRG) in thin films of azobenzene materials depends on their glass transition temperature (Tg), with an optimal Tg around 50–60 °C yielding the fastest SRG growth. Herein, the SRG growth of five analogous Disperse Red 1 molecular glasses with Tg values ranging from 9 to 71 °C was studied with two different laser wavelengths (488 and 532 nm). It was found that the optimal Tg for SRG growth increases with laser irradiance, from approximately 50 °C at 100 mW cm−2 to over 70 °C at 300 mW cm−2. Furthermore, the azobenzene glass with a sub-ambient Tg of 9 °C can inscribe self-erasable gratings that collapse spontaneously when irradiation is stopped in a repeatable fashion, thereby paving the way for light-controlled optical devices.

Graphical abstract: Azobenzene molecular glasses with tuned glass transition temperatures: from optimal light-induced motion to self-erasable gratings

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Supplementary files

Article information


Submitted
21 Jan 2020
Accepted
31 Mar 2020
First published
01 Apr 2020

J. Mater. Chem. C, 2020,8, 6203-6213
Article type
Paper

Azobenzene molecular glasses with tuned glass transition temperatures: from optimal light-induced motion to self-erasable gratings

A. Diggins, E. Dawson, M. Kamaliardakani, C. Pellerin, R. G. Sabat and O. Lebel, J. Mater. Chem. C, 2020, 8, 6203
DOI: 10.1039/D0TC00393J

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