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Article

Visible Light Assisted Organosilane Assembly on Mesoporous Silicon Films and Particles

1
Departamento de Física Aplicada and Instituto de Ciencia de Materiales Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain
2
Centro de Microanálisis de Materiales, Universidad Autónoma de Madrid, 28049 Madrid, Spain
3
European Commission, Joint Research Center, 21020 Ispra (Va), Italy
*
Author to whom correspondence should be addressed.
Materials 2019, 12(1), 131; https://doi.org/10.3390/ma12010131
Received: 25 November 2018 / Revised: 17 December 2018 / Accepted: 25 December 2018 / Published: 3 January 2019
(This article belongs to the Special Issue Surface Modification to Improve Properties of Materials)
Porous silicon (PSi) is a versatile matrix with tailorable surface reactivity, which allows the processing of a range of multifunctional films and particles. The biomedical applications of PSi often require a surface capping with organic functionalities. This work shows that visible light can be used to catalyze the assembly of organosilanes on the PSi, as demonstrated with two organosilanes: aminopropyl-triethoxy-silane and perfluorodecyl-triethoxy-silane. We studied the process related to PSi films (PSiFs), which were characterized by X-ray photoelectron spectroscopy (XPS), time of flight secondary ion mass spectroscopy (ToF-SIMS) and field emission scanning electron microscopy (FESEM) before and after a plasma patterning process. The analyses confirmed the surface oxidation and the anchorage of the organosilane backbone. We further highlighted the surface analytical potential of 13C, 19F and 29Si solid-state NMR (SS-NMR) as compared to Fourier transformed infrared spectroscopy (FTIR) in the characterization of functionalized PSi particles (PSiPs). The reduced invasiveness of the organosilanization regarding the PSiPs morphology was confirmed using transmission electron microscopy (TEM) and FESEM. Relevantly, the results obtained on PSiPs complemented those obtained on PSiFs. SS-NMR suggests a number of siloxane bonds between the organosilane and the PSiPs, which does not reach levels of maximum heterogeneous condensation, while ToF-SIMS suggested a certain degree of organosilane polymerization. Additionally, differences among the carbons in the organic (non-hydrolyzable) functionalizing groups are identified, especially in the case of the perfluorodecyl group. The spectroscopic characterization was used to propose a mechanism for the visible light activation of the organosilane assembly, which is based on the initial photoactivated oxidation of the PSi matrix. View Full-Text
Keywords: porous silicon; visible light assisted organosilanization; solid state NMR; XPS; ToF-SIMS porous silicon; visible light assisted organosilanization; solid state NMR; XPS; ToF-SIMS
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MDPI and ACS Style

Rodriguez, C.; Muñoz Noval, A.; Torres-Costa, V.; Ceccone, G.; Manso Silván, M. Visible Light Assisted Organosilane Assembly on Mesoporous Silicon Films and Particles. Materials 2019, 12, 131. https://doi.org/10.3390/ma12010131

AMA Style

Rodriguez C, Muñoz Noval A, Torres-Costa V, Ceccone G, Manso Silván M. Visible Light Assisted Organosilane Assembly on Mesoporous Silicon Films and Particles. Materials. 2019; 12(1):131. https://doi.org/10.3390/ma12010131

Chicago/Turabian Style

Rodriguez, Chloé, Alvaro Muñoz Noval, Vicente Torres-Costa, Giacomo Ceccone, and Miguel Manso Silván. 2019. "Visible Light Assisted Organosilane Assembly on Mesoporous Silicon Films and Particles" Materials 12, no. 1: 131. https://doi.org/10.3390/ma12010131

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