Microcantilever arrays functionalised with spiropyran photoactive moieties as systems to measure photo-induced surface stress changes
| Autor: | Fernando Benito-Lopez, Fran Pedreschi, Luke A. J. O'Neill, Larisa Florea, Roberto Raiteri, Slavica Koprivica, Fiona M. Lyng, Silvia Scarmagnani, Catherine Grogan |
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| Rok vydání: | 2016 |
| Předmět: |
Materials Chemistry2506 Metals and Alloys
INSTRUMENTS AND INSTRUMENTATION ELECTRONIC OPTICAL AND MAGNETIC MATERIALS Organic chemistry Molecular switch 02 engineering and technology Photochemistry 01 natural sciences Coatings and Films chemistry.chemical_compound Materials Chemistry Ultraviolet light Merocyanine ELECTRICAL AND ELECTRONIC ENGINEERING skin and connective tissue diseases Instrumentation Spiropyran chemistry.chemical_classification microcantilever sensors Microcantilever sensors Nanomechanics Photochromism Surface stress Electronic Optical and Magnetic Materials Condensed Matter Physics Surfaces Coatings and Films 2506 Electrical and Electronic Engineering Metals and Alloys Polymer photochromism METALS AND ALLOYS 021001 nanoscience & nanotechnology Surfaces Chemistry 0210 nano-technology Materials science Nanotechnology 010402 general chemistry Monolayer Electronic Optical and Magnetic Materials PHYSICS CONDENSED MATTER surface stress SURFACES COATINGS AND FILMS CHEMISTRY MATERIALS spiropyran molecular switch nanomechanics 0104 chemical sciences chemistry sense organs |
| Zdroj: | Addi. Archivo Digital para la Docencia y la Investigación instname Grogan, Catherine, Florea, Larisa ORCID: 0000-0002-4704-2393 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2016.06.108 |
| Popis: | [EN] 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. Uponultraviolet 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 incompressive 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 = 24) while the spiropyran monolayer coated cantilevers have an average surface stress change of about 446 Nm−1(n = 8) upon irradiation with UV light. This project was supported by the Dublin Institute of Technology Research Support Programme with the IPS grant scheme. The project was also supported by Science Foundation Ireland underINSIGHT award SFI/12/RC/2289. 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. C.G. thanks Rob Cain for technical assistance with the Veriscan3000 system. |
| Databáze: | OpenAIRE |
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