Investigation of solid surfaces modified by Langmuir-Blodgett monolayers using sum-frequency vibrational spectroscopy and X-ray photoelectron spectroscopy

The Journal of Physical Chemistry. B
Tamas KeszthelyiLaszló Guczi

Abstract

Langmuir-Blodgett (LB) monomolecular layers of alkylhydroxamic acids and alkylphosphonic acids on copper and iron substrates have been studied by X-ray photoelectron spectroscopy (XPS) and sum-frequency vibrational spectroscopy. According to the XPS results, the structures of the hydroxamic acid and phosphonic acid Langmuir-Blodgett films are very similar: the thickness of the layer of the hydrocarbon tails is typically 1.9-2.1 nm, while the layer of headgroups is about 0.3-0.35 nm thick. The tilt angle of the carbon chains is estimated to be 20-30 degrees with respect to the sample surface normal, and the molecules are connected to the substrate via their headgroups. Analysis of the P 2p and N 1s lines indicates the presence of deprotonated headgroups. The substrate Cu 2p line includes a component which can be assigned to Cu(2+) ions in a thin Cu(OH)(2) layer. The deposition of LB layers led to significant decrease of the hydroxide-related signal, which indicates that binding of the headgroups to the surface is accompanied by the elimination of water molecules. The sum-frequency spectra also clearly indicate that well-ordered monolayers can be formed by the Langmuir-Blodgett technique. Since the non-resonant background from th...Continue Reading

Citations

Apr 20, 2013·Biochimica Et Biophysica Acta·Gabriella NyitraiLászló Héja
May 27, 2016·Chemical Reviews·Sergio A PaniaguaSeth R Marder
Oct 8, 2014·ACS Applied Materials & Interfaces·Chaiya PrasittichaiStacey F Bent
May 18, 2013·The Journal of Physical Chemistry. B·Tamás KeszthelyiÉva Kiss
Jun 23, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Tamás KeszthelyiLászló Héja
Jun 10, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Julian RechmannAndreas Erbe
Jul 11, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Jian ZhangJean-Pierre Cloarec

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