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231225s2017 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.7b03683
|2 doi
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|a eng
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| 100 |
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|a Pujari, Sidharam P
|e verfasserin
|4 aut
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|a High-Density Modification of H-Terminated Si(111) Surfaces Using Short-Chain Alkynes
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|c 2017
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|a Text
|b txt
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|a ƒaComputermedien
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|a Date Completed 06.08.2018
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|a Date Revised 28.12.2019
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a 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- and butenyl-coated Si(111) surfaces display a significantly higher packing density than conventional C10-C18 alkyne-derived 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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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Filippov, Alexei D
|e verfasserin
|4 aut
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| 700 |
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|a Gangarapu, Satesh
|e verfasserin
|4 aut
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| 700 |
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|a Zuilhof, Han
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1999
|g 33(2017), 51 vom: 26. Dez., Seite 14599-14607
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|x 1520-5827
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|g volume:33
|g year:2017
|g number:51
|g day:26
|g month:12
|g pages:14599-14607
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|u http://dx.doi.org/10.1021/acs.langmuir.7b03683
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