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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Compression-Induced Conformation and Orientation Changes in an n-Alkane Monolayer on a Au(111) Surface.
Langmuir : the ACS Journal of Surfaces and Colloids 2017 April 26
The influence of the preparation method and adsorbed amount of n-tetratetracontane (n-C44 H90 ) 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-C44 H90 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.
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