Advanced Functional Materials, volume 21, issue 21, pages 4109-4119
Nanostructuring of Azomolecules in Silica Artificial Opals for Enhanced Photoalignment
1
Instituto de Ciencia de Materiales de Madrid and Unidad Asociada CSIC‐UVigo, c/Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain
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Publication type: Journal Article
Publication date: 2011-09-13
Journal:
Advanced Functional Materials
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 19
ISSN: 1616301X
Electronic, Optical and Magnetic Materials
Electrochemistry
Condensed Matter Physics
Biomaterials
Abstract
Many modern systems are based on photoresponsive materials, in which properties such as the refractive index need to be effectively controlled. An extensively used means of achieving this is to photoinduce birefringence by alignment of anisotropic azochromophores via light-induced isomerization. However, the refractive index changes are typically small (<10−2), slow (seconds or minutes) and not spontaneously reversible, which excludes use of this approach in a variety of optical systems. The drawbacks are generally attributed to hindered photoalignment due to the molecular environment, which suggests that optimizing the arrangement of the functional moieties to minimize the mobility restrictions could decisively improve the photoresponse. Here, a simple solution-processing approach is reported for favorable distribution at the molecular level of neat azochromophore into a three-dimensionally nanostructured hybrid system exhibiting an extremely enhanced photoresponse. The standard azoderivative Disperse Red 1 is adsorbed on silica colloidal crystals that are chosen as 3D-templates because their photonic bandgap, which is sensitive to refractive index changes, provides a direct tool to study photostimulated processes in the chromophore. The system is thoroughly investigated with different techniques to identify molecular out-of-plane photoalignment as the main phenomenon responsible for the optical response, and to discern the key factors leading to improved performance. It is found that the dye molecules are spontaneously adsorbed on the silica spheres, building a highly photoreactive surface multilayer. A low amount of azochromophore allows for outstanding material response upon cw-irradiation, as a result of very large and fast refractive index changes in the chromophore ensemble (up to 0.36 – birefringence of 1.1 – in 15 ms at 0.09 J cm−2) that, in addition, is fully reversible by thermalization. Finally, as proof-of-principle for real applications, long-duty cycle photoswitching at 100 Hz (for over 2 million cycles) is demonstrated in this system.
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Citations by publishers
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1 publication, 9.09%
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Optical Society of America
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Optical Society of America
1 publication, 9.09%
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- We do not take into account publications that without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Gallego-Gomez F. et al. Nanostructuring of Azomolecules in Silica Artificial Opals for Enhanced Photoalignment // Advanced Functional Materials. 2011. Vol. 21. No. 21. pp. 4109-4119.
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Gallego-Gomez F., Blanco A., Golmayo D., López C. Nanostructuring of Azomolecules in Silica Artificial Opals for Enhanced Photoalignment // Advanced Functional Materials. 2011. Vol. 21. No. 21. pp. 4109-4119.
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TY - JOUR
DO - 10.1002/adfm.201101410
UR - https://doi.org/10.1002%2Fadfm.201101410
TI - Nanostructuring of Azomolecules in Silica Artificial Opals for Enhanced Photoalignment
T2 - Advanced Functional Materials
AU - Gallego-Gomez, F.
AU - Blanco, A
AU - Golmayo, Dolores
AU - López, C.
PY - 2011
DA - 2011/09/13 00:00:00
PB - Wiley
SP - 4109-4119
IS - 21
VL - 21
SN - 1616-301X
ER -
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@article{2011_Gallego-Gomez,
author = {F. Gallego-Gomez and A Blanco and Dolores Golmayo and C. López},
title = {Nanostructuring of Azomolecules in Silica Artificial Opals for Enhanced Photoalignment},
journal = {Advanced Functional Materials},
year = {2011},
volume = {21},
publisher = {Wiley},
month = {sep},
url = {https://doi.org/10.1002%2Fadfm.201101410},
number = {21},
pages = {4109--4119},
doi = {10.1002/adfm.201101410}
}
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Gallego-Gomez, F., et al. “Nanostructuring of Azomolecules in Silica Artificial Opals for Enhanced Photoalignment.” Advanced Functional Materials, vol. 21, no. 21, Sep. 2011, pp. 4109-4119. https://doi.org/10.1002%2Fadfm.201101410.