Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 536154
Title High-Density modification of H-Terminated Si(111) surfaces using Short-Chain Alkynes
Author(s) Pujari, Sidharam P.; Filippov, Alexei D.; Gangarapu, Satesh; Zuilhof, Han
Source Langmuir 33 (2017)51. - ISSN 0743-7463 - p. 14599 - 14607.
Department(s) Laboratory for Organic Chemistry
Publication type Refereed Article in a scientific journal
Publication year 2017
Abstract H-Si(111)-terminated surfaces were alkenylated via two routes: Through a novel one-step gas-phase hydrosilylation reaction with short alkynes (C3 to C6) and for comparison via a two-step chlorination and Grignard alkenylation process. All modified surfaces were characterized by static water contact angles and X-ray photoelectron spectroscopy (XPS). Propenyl- A nd butenyl-coated Si(111) surfaces display a significantly higher packing density than conventional C10-C18 alkynederived monolayers, showing the potential of this approach. In addition, propyne chemisorption proceeds via either of two approaches: The standard hydrosilylation at the terminal carbon (lin) at temperatures above 90°C and an unprecedented reaction at the second carbon (iso) at temperatures below 90°C. Molecular modeling revealed that the packing energy of a monolayer bonded at the second carbon is significantly more favorable, which drives iso-attachment, with a dense packing of surface-bound iso-propenyl chains at 40% surface coverage, in line with the experiments at <90°C. The highest density monolayers are obtained at 130°C and show a linear attachment of 1-propenyl chains with 92% surface coverage.
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