Authors: Kraut, Nadine D.; Brattlie, Joshua D.; Deuro, Randi E.; McGoorty, Michelle M.; Bright, Frank V.

Source: Applied Spectroscopy, Volume 66, Issue 10, Pages 272A-2598A and 1091-1248 (October 2012) , pp. 1171-1178(8)

Publisher: Society for Applied Spectroscopy

Abstract:

A high-throughput screening system has been developed to rapidly produce, screen, and assess the usefulness of organically modified silane (ORMOSIL)-based xerogel films formed on the surface of porous silicon (pSi) surfaces. The ORMOSILs tested include methyltriethoxysilane, n-octyltriethoxysilane, n-hexyltriethoxysilane, n-propyltriethoxysilane, 2-cyanoethyltriethoxysilane, phenyltriethoxysilane, benzyltriethoxysilane, vinyltriethoxysilane, tetraethoxysilane, and hexafluoroethyltriethoxysilane. Xerogel microarrays were pin-printed on the surface of O₃ oxidized pSi using a computer-controlled robotic pin-printer. The fragile pSi required careful pin-printing parameter optimization to simultaneously ensure sufficient sol application and limit pin-induced damage. These multi-functional xerogel-pSi microarrays were exposed to harsh conditions (0.1 mM NaOH, 15 min) to determine the extent to which the xerogel protected the pSi. Microarray assessment included multispectral photoluminescence and infrared imaging. Results demonstrate that the more hydrophobic/nonpolar xerogel films (n-octyltriethoxysilane, n-hexyltriethoxysilane) protect the pSi surface the most and maintained the pSi photoluminescence. Also, unlike xerogel material doped with a reporter molecule, the uniformity of the printed feature plays a role in the protection of the pSi material underneath. Areas with thinner xerogel distributions allowed the permeation of NaOH whereas the thicker areas prohibit pSi exposure to NaOH.

Keywords: Porous silicon; Epi-luminescence microscopy; Multispectral imaging; Fourier transform infrared microscopy; FT-IR microscopy; High-throughput screening; Robotic pin-printing

Document Type: Research article

DOI: http://dx.doi.org/10.1366/12-06625

Publication date: 2012-10-01

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