X-ray studies of self-assembled organic monolayers grown on hydrogen-terminated Si(111)

Langmuir : the ACS Journal of Surfaces and Colloids
Hua JinMichael J Bedzyk

Abstract

The structure of self-assembled monolayers (SAMs) of undecylenic acid methyl ester (SAM-1) and undec-10-enoic acid 2-bromo-ethyl ester (SAM-2) grown on hydrogen-passivated Si(111) were studied by X-ray reflectivity (XRR), X-ray standing waves (XSW), X-ray fluorescence (XRF), atomic force microscopy, and X-ray photoelectron spectroscopy (XPS). The two different SAMs were grown by immersion of H-Si(111) substrates into the two different concentrated esters. UV irradiation during immersion was used to create Si dangling bond sites that act as initiators of the surface free-radical addition process that leads to film growth. The XRR structural analysis reveals that the molecules of SAM-1 and SAM-2 respectively have area densities corresponding to 50% and 57% of the density of Si(111) surface dangling bonds and produce films with less than 4 angstroms root-mean-square roughness that have layer thicknesses of 12.2 and 13.2 angstroms. Considering the molecular lengths, these thicknesses correspond to a 38 degrees and 23 degrees tilt angle for the respective molecules. For SAM-2/Si(111) samples, XRF analysis reveals a 0.58 monolayer (ML) Br total coverage. Single-crystal Bragg diffraction XSW analysis reveals (unexpectedly) that 0.48 M...Continue Reading

References

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Citations

May 12, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Simone CiampiJ Justin Gooding
Jan 26, 2011·Physical Chemistry Chemical Physics : PCCP·Alice BocciaAndrea Secchi
Jul 30, 2011·Physical Chemistry Chemical Physics : PCCP·Simone CiampiJ Justin Gooding
Aug 4, 2009·ChemSusChem·Marijke Van der Steen, Christian V Stevens
Mar 6, 2009·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Kai HuangFrançoise Vinet
Feb 18, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Ying YangJ Justin Gooding
Jul 16, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·F YangJ Rappich
Nov 12, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Rodney T ChenFrank Caruso
Dec 19, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Anne CharrierGregory P Lopinski
Feb 18, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Jui-Ching LinMichael J Bedzyk
Oct 23, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Michael K F LoHarold G Monbouquette
Aug 24, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Gillian CollinsJustin D Holmes
Jan 27, 2007·The Journal of Physical Chemistry. B·S FellahM Stchakovsky
Sep 23, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Tzu-Ling LiuStacey F Bent

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