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Nano-patterned layers of a grafted coumarinic chromophore

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Frederich, Nadia [UCL] Nysten, Bernard [UCL] Muls, Benoît [UCL] Hofkens, Johan [Kuleuven - Department of Chemistry] Habib Jiwan, Jean-Louis [UCL] Jonas, Alain M. [UCL]

We report on the grafting of coumarin chromophores on flat silicon surfaces and in regions of nanometric dimensions drawn on silicon surfaces. The coumarin derivative was grafted by using the quaternization of a tertiary amine group of the chromophore with a ((chloromethyl)phenylethyl)-dimethylchlorosilane (CMPDCS) grafted on silicon. Complete characterization of the grafted layer was performed as a function of reaction time by X-ray photoelectron spectroscopy, X-ray reflectometry, atomic force microscopy, fluorescence spectroscopy and laser-scanning confocal microscopy. The results indicate that about one chromophore molecule is grafted every second CMPDCS molecule, resulting in a surface density of coumarin of slightly more than one coumarin per nm2. A broadening of the distribution of the fluorescence lifetimes was observed, suggesting that the grafted molecules experience a larger distribution of environments in the grafted layer than in solution. Since this reaction is fully compatible with silicon processing technology, the grafting could also be performed in nano-regions of size as small as 250 nm defined by combining electron-beam lithography with silanization. In such nano-sized regions the distribution of fluorescence lifetimes was narrower, suggesting a possible influence of the confinement on the organization of the molecules.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2008
Language Anglais
Journal information "Photochemical and Photobiological Sciences" - Vol. 7, no. 4, p. 460-466 (avril 2008)
Peer reviewed yes
Publisher Royal Society of Chemistry (Cambridge (UK))
issn 1474-905X
e-issn 1474-905X
Publication status Publié
Affiliations UCL - FSA/MAPR - Département des sciences des matériaux et des procédés
UCL - SC/CHIM - Département de chimie
MESH Subject Spectrum Analysis ; Silicon - chemistry ; Nanostructures - chemistry - ultrastructure ; Molecular Structure ; Microscopy, Electron ; Microscopy, Atomic Force ; Coumarins - chemistry
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Bibliographic reference Frederich, Nadia ; Nysten, Bernard ; Muls, Benoît ; Hofkens, Johan ; Habib Jiwan, Jean-Louis ; et. al. Nano-patterned layers of a grafted coumarinic chromophore. In: Photochemical and Photobiological Sciences, Vol. 7, no. 4, p. 460-466 (avril 2008)
Permanent URL http://hdl.handle.net/2078.1/127518