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Nature Materials
Published online: 10 January 2010 | doi:10.1038/nmat2611


Nanopatterning Si(111) surfaces as a selective surface-chemistry route
David J. Michalak1,4, Sandrine Rivillon Amy1,4, Damien Aureau2, Min Dai1, Alain Est¨¨ve3 & Yves J. Chabal2



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AbstractUsing wet-chemical self-assembly, we demonstrate that standard surface reactions can be markedly altered. Although HF etching of Si surfaces is known to produce H-terminated surfaces, we show that up to ~30% of a monolayer of stable Si¨CF bonds can be formed on atomically smooth Si(111) surfaces on HF reaction, when chemically isolated Si atoms are the target of the reaction. Similarly, ~30% Si¨COH termination can be achieved by immersion of the partially covered F¨CSi(111) surface in water without oxidation of the underlying Si substrate. Such reactions are possible when H-terminated (111)-oriented Si surfaces are initially uniformly patterned with methoxy groups. These findings are contrary to the knowledge built over the past twenty years and highlight the importance of steric interactions at surfaces and the possibility to stabilize products at surfaces that cannot be obtained on chemically homogeneous surfaces.
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