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Compression-Induced Conformation and Orientation Changes in an n-Alkane Monolayer on a Au(111) Surface
- Source :
- Langmuir. 33:3934-3940
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- The influence of the preparation method and adsorbed amount of n-tetratetracontane (n-C44H90) on its orientation in a monolayer on the Au(111) surface is studied by near carbon K-edge X-ray absorption fine structure spectroscopy (C K-NEXAFS), scanning tunneling microscopy (STM) under ultrahigh vacuum, and infrared reflection–absorption spectroscopy (IRAS) at the electrochemical interface in sulfuric acid solution. The n-C44H90 molecules form self-assembled lamellar structures with the chain axis parallel to the surface, as observed by STM. For small amounts adsorbed, the carbon plane is parallel to the surface (flat-on orientation). An increase in the adsorbed amount by ∼10–20% induces compression of the lamellar structure either along the lamellar axis or alkyl chain axis. The compressed molecular arrangement is observed by STM, and induced conformation and orientation changes are confirmed by in situ IRAS and C K-NEXAFS.
- Subjects :
- chemistry.chemical_classification
Analytical chemistry
02 engineering and technology
Surfaces and Interfaces
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
law.invention
Crystallography
Adsorption
chemistry
law
Monolayer
Electrochemistry
Molecule
General Materials Science
Lamellar structure
Absorption (chemistry)
Scanning tunneling microscope
0210 nano-technology
Spectroscopy
Alkyl
Subjects
Details
- ISSN :
- 15205827 and 07437463
- Volume :
- 33
- Database :
- OpenAIRE
- Journal :
- Langmuir
- Accession number :
- edsair.doi.dedup.....5d9165220dbe8bea1a62f3babbeec7ae
- Full Text :
- https://doi.org/10.1021/acs.langmuir.6b04259