NDLI: Structure of isophthalic acid based monolayers and its relation to the initial stages of growth of metal

Content Provider	Royal Society of Chemistry (RSC)
Author	Cebula, Izabela Zharnikov, Michael Brown, Christopher Shen, Cai Zhao, Jianli Buck, Manfred
Copyright Year	2012
Abstract	Self-assembled monolayers (SAMs) of isophthalic acid (IPA) and trimesic acid (TMA) formed on Cu modified Au(111) substrates by adsorption from aqueous solution were characterised by synchrotron-based X-ray photoelectron spectroscopy (XPS), near-edge X-ray absorption fine structure spectroscopy (NEXAFS) and scanning tunneling microscopy (STM). Applying the layer-by-layer (LbL) method, the initial stages of growth of metal–organic coordination layers from Cu-acetate and TMA has been studied by STM. Both IPA and TMA SAMs exhibit a row structure with the aromatic units tilted by about 45° with respect to the surface normal. The average distance between rows is 3 × Au–Au distance (= 8.67 Å) with, however, slight variations between different rows. For IPA a very regular pattern is observed giving rise to a rectangular (9 × √3) unit cell containing three molecules. Combining all data a structure is suggested where the molecules are tilted and azimuthally rotated. The variation in the inter-row distance is explained by correlated tilts and rotations in opposite directions. STM studies of the first two LbL deposition cycles reveal predominantly disordered nucleation at domain boundaries. The observation of epitaxial features is explained to arise from a particular combination of molecular orientation in adjacent rows.
Starting Page	1858
Ending Page	1865
Page Count	8
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	3
Issue Number	6
Journal	Chemical Science
DOI	10.1039/c2sc20087b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Acid Nucleation TMA X-ray absorption fine structure Photoemission spectroscopy Scanning tunneling microscope Normal (geometry) Isopropyl alcohol Cu Adsorption Self-assembled monolayer X-ray photoelectron spectroscopy Trimethoxyamphetamine Crystal structure
Content Type	Text
Resource Type	Article
Subject	Chemistry

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