Journal article
Simple methods for the direct assembly, functionalization, and patterning of acid-terminated monolayers on Si(111)
Langmuir, Vol.21(23), pp.10537-10544
2005
DOI: 10.1021/la051369a
PMID: 16262318
Abstract
This article describes mild methods to directly assemble, functionalize, and pattern monolayers of undecylenic acid on hydrogen-terminated Si(111). These monolayers were assembled under very mild conditions from a neat solution of undecylenic acid containing 0.1 mol % 4-(decanoate)-2,2,6,6-tetramethylpiperidinooxy at room temperature without the need for UV light. Because of these mild conditions, monolayers exposing carboxylic acids could be assembled in one step without the need to protect the acid prior to its assembly. The monolayers were extensively characterized by horizontal attenuated total reflection infrared spectroscopy, X-ray photoelectron spectroscopy (XPS), and contact angle goniometry. The monolayers bonded to the silicon surface preferentially through the olefin with no detectable bonds between the carboxylic acids and silicon. The crystallinity of the monolayer was studied by infrared spectroscopy through the antisymmetric-v a(CH 2)-and symmetric-v s(CH 2)-stretches for methylene. Because it is important for future applications to assemble functional surfaces, methods to react the acid-terminated monolayers with trifluoroacetic anhydride and triethylamine to yield a symmetric anhydride on the monolayer were studied. These anhydrides were reacted with a variety of milligram-quantity amines to yield amide-terminated surfaces. This method was general, and a variety of amines could be bonded to the monolayer. The stabilities of these monolayers upon exposure to ambient conditions and under a variety of solvents were described. Because patterned monolayers have found wide applications, we have developed methods to pattern 1-octadecylamine and poly(ethylenimine) on the micrometer scale using soft lithography. In addition, polymer brushes of polynorbornene with thicknesses from 32 to 150 nm were grown from monolayers patterned with the Grubbs' catalyst. The patterned surfaces were imaged by scanning electron microscopy, scanning probe microscopy, and ellipsometry to determine the thicknesses of the patterns and the fidelity of the method. © 2005 American Chemical Society.
Details
- Title: Subtitle
- Simple methods for the direct assembly, functionalization, and patterning of acid-terminated monolayers on Si(111)
- Creators
- Mathew Perring - Department of Chemistry, University of Iowa, 423K Chemistry Building, Iowa City, Iowa 52242, United StatesSamrat Dutta - Department of Chemistry, University of Iowa, 423K Chemistry Building, Iowa City, Iowa 52242, United StatesSamer Arafat - Department of Chemistry, University of Iowa, 423K Chemistry Building, Iowa City, Iowa 52242, United StatesMichael Mitchell - Department of Chemical & Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United StatesPaul J. A Kenis - Department of Chemical & Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United StatesNed B Bowden - Department of Chemistry, University of Iowa, 423K Chemistry Building, Iowa City, Iowa 52242, United States
- Resource Type
- Journal article
- Publication Details
- Langmuir, Vol.21(23), pp.10537-10544
- Publisher
- American Chemical Society
- DOI
- 10.1021/la051369a
- PMID
- 16262318
- ISSN
- 0743-7463
- eISSN
- 1520-5827
- Language
- English
- Date published
- 2005
- Academic Unit
- Chemistry
- Record Identifier
- 9984216562402771
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