Amino-functionalized monolayers covalently grafted to silica-based substrates as a robust primer anchorage in aqueous media

[Display omitted] •The best hydrolytic stability of aminoalkylsilane monolayers reported so far.•Stability relies on long alkyl chains with large and homogenous surface coverage.•A fine tuning in surface coverage of aminoalkylsilane monolayers is demonstrated.•Concentration, reaction time and humidi...

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Bibliographic Details
Published in:Applied surface science 2016-05, Vol.370, p.476-485
Main Authors: Giraud, Lucie, Nadarajah, Rakini, Matar, Yasmine, Bazin, Gwénaëlle, Sun, Jing, Zhu, X.X., Giasson, Suzanne
Format: Article
Language:English
Subjects:
Covalence
Density
Grafting
Grafting density
Hydrolytic stability
Monolayer
Monolayers
Nanoparticles
Self assembly
Silane
Stability
Substrates
Surface coverage
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Summary:[Display omitted] •The best hydrolytic stability of aminoalkylsilane monolayers reported so far.•Stability relies on long alkyl chains with large and homogenous surface coverage.•A fine tuning in surface coverage of aminoalkylsilane monolayers is demonstrated.•Concentration, reaction time and humidity should be strictly controlled.•Immobilizing particles with stable controlled density on aminoalkylsilane monolayers. Controlling surface coverage and stability of supported aminoalkylsilane monolayers on silica-based substrates still remains a challenge for the development of biosensors and nanomaterials. We have developed protocols using simple surface chemistry and self-assembly from solution without stringent deposition conditions to covalently attach monolayers of 11-aminoundecyltriethoxysilane (AUTES) onto mica and silica substrates. The resulting self-assembled monolayers (SAMs) exhibited excellent hydrolytic stability. The long alkyl chain together with the large grafting density and homogeneity enhanced the monolayer stability by preventing the SisilaneOSisurface bonds from hydrolysis over a wide range of pH values (2–10) for long time periods (up to 8 days). The control over the surface density of amino groups was achieved and the reactivity of the amino SAMs was confirmed by covalently attaching carboxyl-functionalized nanoparticles on the SAMs. The immobilized nanoparticles exhibited the same hydrolytic stability as that of the SAMs. The AUTES SAMs prepared in this study exhibited the best hydrolytic stability of similar systems reported so far.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2016.02.141