Issue 27, 2013
From the journal:

Physical Chemistry Chemical Physics

Spectroscopic ellipsometry of self assembled monolayers: interface effects. The case of phenyl selenide SAMs on gold†

Maurizio Canepa,*a   Giulia Maidecchi,a   Chiara Toccafondi,‡a   Ornella Cavalleri,a   Mirko Prato,b   Vijay Chaudharicd  and  Vladimir A. Esaulovc  

* Corresponding authors

a CNISM and Dipartimento di Fisica, Universitá di Genova, Via Dodecaneso 33, Genova, Italy
E-mail: canepa@fisica.unige.it

b Nanochemistry, Istituto Italiano di Tecnologia, Via Morego 30, Genova, Italy

c Université Paris Sud, Institut des Sciences Moléculaires d'Orsay (ISMO), Orsay, France

d Department of Nano Science and Technology, University Institute of Chemical Technology, North Maharashtra University, Jalgaon - 425 001, India

Abstract

This work focuses on the quantitative application of spectroscopic ellipsometry to the study of optical properties and thickness of self assembled monolayers (SAMs) of phenyl selenide deposited from the liquid phase on gold. STM, XPS and cyclic voltammetry measurements provide additional chemical and morphological characterization of the SAMs. While routine ellipsometry analysis of SAMs often relies on the film-induced δΔ change in the Δ ellipsometric angle and discards SAM–substrate interface effects, the present data show a distinctive behaviour of the δΨ data that we assign to interface effects, stronger than those previously found for densely packed alkanethiol SAMs. An inaccurate modelling of the variations in Ψ related to the nano-structured SAM–substrate interface leads to a large overestimation of the film thickness. A simple model, which takes into account an effective approximation for the interface layer between the film and the substrate, and the molecular optical absorptions, provides a good agreement between the data and a reliable thickness estimate of the SAM.

Graphical abstract: Spectroscopic ellipsometry of self assembled monolayers: interface effects. The case of phenyl selenide SAMs on gold

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Article information

DOI
https://doi.org/10.1039/C3CP51304A
Article type
Paper
Submitted
27 Mar 2013
Accepted
09 May 2013
First published
13 May 2013

Phys. Chem. Chem. Phys., 2013,15, 11559-11565

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Spectroscopic ellipsometry of self assembled monolayers: interface effects. The case of phenyl selenide SAMs on gold

M. Canepa, G. Maidecchi, C. Toccafondi, O. Cavalleri, M. Prato, V. Chaudhari and V. A. Esaulov, Phys. Chem. Chem. Phys., 2013, 15, 11559 DOI: 10.1039/C3CP51304A

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