American Chemical Society, Journal of Physical Chemistry C, 6(114), p. 2617-2621, 2010
DOI: 10.1021/jp908440u
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In this work, we have quantified the functionalization of some porous silicon multilayers that optically act as Bragg reflectors: 1.3 x 10(-3) mol/g, corresponding to 3.25 nmol/cm(2), of a ten base oligonucleotide has been estimated by a chemical procedure, based on the dimethoxytrityl monitoring. The oligonucleotide has been synthesized directly on two different porous silicon structures, one oxidized by a thermal treatment, the other by a chemical process based on exposure to I(2)/pyridine. We have also monitored the oligonucleotide synthesis by a label-free technique: a 11 nm red-shift of the optical spectrum can be observed by spectroscopic reflectometry.