by C. Rodriguez, P. Laplace, D. Gallach-Pérez, P. Pellacani, R. J. Martín-Palma, V. Torres-Costa, G. Ceccone and M. Manso Silván
Abstract:
Luminescent structures based on semiconductor quantum dots (QDs) are increasingly used in biomolecular assays, cell tracking systems, and in-vivo diagnostics devices. In this work we have carried out the functionalization of porous silicon (PSi) luminescent structures by a perfluorosilane (Perfluoro-octyltriethoxysilane, PFOS) self assembly. The PFOS surface binding (traced by X-ray photoelectron spectroscopy) and photoluminescence efficiency were analyzed on flat model PSi. Maximal photoluminescence intensity was obtained from PSi layers anodized at 110mA/cm2. Resistance to hydroxylation was assayed in H2O2:ethanol solutions and evidenced by water contact angle (WCA) measurements. PFOS-functionalized PSi presented systematically higher WCA than untreated PSi. The PFOS functionalization was found to slightly improve the aging of the PSi particles in water giving rise to particles with longer luminescent life. Confirmation of PFOS binding to PSi particles was derived from FTIR spectra and the preservation of luminescence was observed by fluorescence microscopy. Such functionalization opens the possibility of promoting hydrophobic-hydrophobic interactions between biomolecules and fluorescent QD structures, which may enlarge their biomedical applications catalogue.
Reference:
C. Rodriguez, P. Laplace, D. Gallach-Pérez, P. Pellacani, R. J. Martín-Palma, V. Torres-Costa, G. Ceccone and M. Manso Silván, “Hydrophobic perfluoro-silane functionalization of porous silicon photoluminescent films and particles”, Applied Surface Science, vol. 380, no. Supplement C, pp. 243–248.
Bibtex Entry:
@article{rodriguez_hydrophobic_2016,
series = {Proceedings for {International} {Conference} on {Surfaces}, {Coatings} and {Nanostructured} {Materials} ({NANOSMAT}-10, {Manchester}, {UK})},
title = {Hydrophobic perfluoro-silane functionalization of porous silicon photoluminescent films and particles},
volume = {380},
issn = {0169-4332},
url = {http://www.sciencedirect.com/science/article/pii/S0169433216001562},
doi = {10.1016/j.apsusc.2016.01.119},
abstract = {Luminescent structures based on semiconductor quantum dots (QDs) are increasingly used in biomolecular assays, cell tracking systems, and in-vivo diagnostics devices. In this work we have carried out the functionalization of porous silicon (PSi) luminescent structures by a perfluorosilane (Perfluoro-octyltriethoxysilane, PFOS) self assembly. The PFOS surface binding (traced by X-ray photoelectron spectroscopy) and photoluminescence efficiency were analyzed on flat model PSi. Maximal photoluminescence intensity was obtained from PSi layers anodized at 110mA/cm2. Resistance to hydroxylation was assayed in H2O2:ethanol solutions and evidenced by water contact angle (WCA) measurements. PFOS-functionalized PSi presented systematically higher WCA than untreated PSi. The PFOS functionalization was found to slightly improve the aging of the PSi particles in water giving rise to particles with longer luminescent life. Confirmation of PFOS binding to PSi particles was derived from FTIR spectra and the preservation of luminescence was observed by fluorescence microscopy. Such functionalization opens the possibility of promoting hydrophobic-hydrophobic interactions between biomolecules and fluorescent QD structures, which may enlarge their biomedical applications catalogue.},
number = {Supplement C},
urldate = {2017-11-03},
journal = {Applied Surface Science},
author = {Rodriguez, C. and Laplace, P. and Gallach-Pérez, D. and Pellacani, P. and Martín-Palma, R. J. and Torres-Costa, V. and Ceccone, G. and Manso Silván, M.},
month = sep,
year = {2016},
keywords = {Hydrophobic, Luminescence, Perfluoro-silane, Porous Silicon, Quantum dots, Self assembly},
pages = {243--248},
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}