Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers

The layer-by-layer (LbL) method is based on sequential deposition of polycations and polyanions. Many of the properties of polyelectrolyte thin films deposited via this method depend on the nature of the topmost layer. Thus, these properties show odd-even oscillations during multilayer growth as the...

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Autores principales: Torasso, N., Armaleo, J.M., Tagliazucchi, M., Williams, F.J.
Formato: JOUR
Materias:
Deposition
Film preparation
Gold deposits
Polyelectrolytes
Thin films
Work function
Conductive substrates
Continuum description
Layer-by-layer methods
Oscillatory behaviors
Polyelectrolyte multilayer
Semiquantitative model
Sequential deposition
Work function modulation
Multilayers
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07437463_v33_n9_p2169_Torasso
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_07437463_v33_n9_p2169_Torasso2023-10-03T15:38:49Z Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers Torasso, N. Armaleo, J.M. Tagliazucchi, M. Williams, F.J. Deposition Film preparation Gold deposits Polyelectrolytes Thin films Work function Conductive substrates Continuum description Layer-by-layer methods Oscillatory behaviors Polyelectrolyte multilayer Semiquantitative model Sequential deposition Work function modulation Multilayers The layer-by-layer (LbL) method is based on sequential deposition of polycations and polyanions. Many of the properties of polyelectrolyte thin films deposited via this method depend on the nature of the topmost layer. Thus, these properties show odd-even oscillations during multilayer growth as the topmost layer alternates from polycations to polyanions. The work function of a (semi)conductive substrate modified with an LbL polyelectrolyte multilayer also displays an oscillatory behavior independent of film thickness. The topmost layer modulates the work function of a substrate buried well below the film. In agreement with previous observations, in this work, we show that the work function of a gold substrate changes periodically with the number of adsorbed layers, as different combinations of polycations and polyanions are deposited using the LbL method. For the first time, we rationalize this behavior in terms of formation of a dipole layer between the excess charge at the topmost layer and the charge of the metal substrate, and we put forward a semiquantitative model based on a continuum description of the electrostatics of the system that reproduces the experimental observations. © 2017 American Chemical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07437463_v33_n9_p2169_Torasso
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Deposition
Film preparation
Gold deposits
Polyelectrolytes
Thin films
Work function
Conductive substrates
Continuum description
Layer-by-layer methods
Oscillatory behaviors
Polyelectrolyte multilayer
Semiquantitative model
Sequential deposition
Work function modulation
Multilayers
spellingShingle Deposition
Film preparation
Gold deposits
Polyelectrolytes
Thin films
Work function
Conductive substrates
Continuum description
Layer-by-layer methods
Oscillatory behaviors
Polyelectrolyte multilayer
Semiquantitative model
Sequential deposition
Work function modulation
Multilayers
Torasso, N.
Armaleo, J.M.
Tagliazucchi, M.
Williams, F.J.
Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers
topic_facet Deposition
Film preparation
Gold deposits
Polyelectrolytes
Thin films
Work function
Conductive substrates
Continuum description
Layer-by-layer methods
Oscillatory behaviors
Polyelectrolyte multilayer
Semiquantitative model
Sequential deposition
Work function modulation
Multilayers
description The layer-by-layer (LbL) method is based on sequential deposition of polycations and polyanions. Many of the properties of polyelectrolyte thin films deposited via this method depend on the nature of the topmost layer. Thus, these properties show odd-even oscillations during multilayer growth as the topmost layer alternates from polycations to polyanions. The work function of a (semi)conductive substrate modified with an LbL polyelectrolyte multilayer also displays an oscillatory behavior independent of film thickness. The topmost layer modulates the work function of a substrate buried well below the film. In agreement with previous observations, in this work, we show that the work function of a gold substrate changes periodically with the number of adsorbed layers, as different combinations of polycations and polyanions are deposited using the LbL method. For the first time, we rationalize this behavior in terms of formation of a dipole layer between the excess charge at the topmost layer and the charge of the metal substrate, and we put forward a semiquantitative model based on a continuum description of the electrostatics of the system that reproduces the experimental observations. © 2017 American Chemical Society.
format JOUR
author Torasso, N.
Armaleo, J.M.
Tagliazucchi, M.
Williams, F.J.
author_facet Torasso, N.
Armaleo, J.M.
Tagliazucchi, M.
Williams, F.J.
author_sort Torasso, N.
title Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers
title_short Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers
title_full Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers
title_fullStr Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers
title_full_unstemmed Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers
title_sort simplified approach to work function modulation in polyelectrolyte multilayers
url http://hdl.handle.net/20.500.12110/paper_07437463_v33_n9_p2169_Torasso
work_keys_str_mv AT torasson simplifiedapproachtoworkfunctionmodulationinpolyelectrolytemultilayers
AT armaleojm simplifiedapproachtoworkfunctionmodulationinpolyelectrolytemultilayers
AT tagliazucchim simplifiedapproachtoworkfunctionmodulationinpolyelectrolytemultilayers
AT williamsfj simplifiedapproachtoworkfunctionmodulationinpolyelectrolytemultilayers
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