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Microcantilever arrays functionalised with spiropyran photoactive moieties as systems to measure photo-induced surface stress changes

Grogan, Catherine and Florea, Larisa and Koprivica, Slavica and Scarmagnani, Silvia and O’Neill, Luke and Lyng, Fiona and Pedreschi, Fran and Benito-Lopez, Fernando and Raiteri, Roberto (2016) Microcantilever arrays functionalised with spiropyran photoactive moieties as systems to measure photo-induced surface stress changes. Sensors and Actuators B Chemical, 237 . pp. 479-486. ISSN 0925-4005

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Abstract

Herein we investigate the feasibility of detecting photo-induced surface stress changes using the deflection response of cantilevers. For this purpose, silicon microcantilevers have been functionalised with spiropyran photochromic molecules, using both a monolayer and a polymeric brushes approach. Upon ultraviolet light irradiation, the spiropyran unit is converted to the merocyanine form due to the photo-induced cleavage of the Cspiro-O bond. The two forms of the molecule have dramatically different charge, polarity and molecular conformations. This makes spiropyrans an ideal system to study the correlation between photo-induced molecular changes and corresponding changes in surface stress. Our investigations include monitoring the changes in static cantilever deflection, and consequently, surface stress of the spiropyran functionalised cantilevers on exposure to ultraviolet light. Cantilever deflection data reveals that ultraviolet induced conformational changes in the spiropyran moiety cause a change in compressive surface stress and this varies with the type of functionalisation method implemented. The change in surface stress response from the spiropyran polymer brushes functionalised cantilevers gives an average surface stress change of 98 Nm-1 (n = 8) while the spiropyran monolayer coated cantilevers have an average surface stress change of about 446 Nm-1 (n = 24) upon irradiation with UV light.

Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Microcantilever sensors; Surface stress; Nanomechanics; Molecular switch; Spiropyran; Photochromism
Subjects:Physical Sciences > Photochemistry
Physical Sciences > Organic chemistry
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Initiatives and Centres > INSIGHT Centre for Data Analytics
Research Initiatives and Centres > National Centre for Sensor Research (NCSR)
Publisher:Elsevier
Official URL:http://www.sciencedirect.com/science/article/pii/S0925400516309613
Copyright Information:© 2016 Elsevier
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
Funders:Science Foundation Ireland under INSIGHT award SFI/12/RC/2289, Dublin Institute of Technology Research Support Programme with the IPS grant scheme, F.B.L. acknowledges the Ramón y Cajal Programme (Ministerio de Economía y Competitividad) and to Marian M. De Pancorbo for letting him to use her laboratory facilities at UPV/EHU
ID Code:21283
Deposited On:26 Jul 2016 13:37 by Larisa Florea. Last Modified 22 May 2017 10:58

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