Electrochemically Induced Morphology and Volume Changes in Surface-Grafted Poly(ferrocenyldimethylsilane) Monolayers

M. Péter; Mark A. Hempenius; Ernst S. Kooij; Toby A. Jenkins; Wolfgang Knoll; Gyula J. Vancso

doi:10.1021/la035656v

Electrochemically Induced Morphology and Volume Changes in Surface-Grafted Poly(ferrocenyldimethylsilane) Monolayers

M. Péter, Mark A. Hempenius, Ernst S. Kooij, Toby A. Jenkins, Wolfgang Knoll, Gyula J. Vancso

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

Poly(ferrocenyldimethylsilanes), composed of alternating ferrocene and dimethylsilane units in their main chain and featuring a thiol end group, were self-assembled to redox-active monolayers on gold. Electrochemical atomic force microscopy was employed to study the morphology of the monolayers as a function of the applied potential in situ. Surface plasmon resonance spectroscopy and spectroscopic ellipsometry measurements, performed under electrochemical control, indicated thickness changes of up to 15% upon oxidizing and reducing the surface-grafted polymers. X-ray reflectivity measurements unambiguously showed a thickness increase upon electrochemical oxidation of the monolayers. The reversible thickness change was attributed to stretching of the polymer chains upon oxidation due to an increase in charge density and to the attraction of counterions and associated solvent molecules, which are released when the polymer film is reduced to its neutral state.

Original language	Undefined
Pages (from-to)	891-897
Number of pages	7
Journal	Langmuir
Volume	20
Issue number	3
DOIs	https://doi.org/10.1021/la035656v
Publication status	Published - 2004

Keywords

METIS-221799
IR-59295

Access to Document

10.1021/la035656v

Cite this

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title = "Electrochemically Induced Morphology and Volume Changes in Surface-Grafted Poly(ferrocenyldimethylsilane) Monolayers",

abstract = "Poly(ferrocenyldimethylsilanes), composed of alternating ferrocene and dimethylsilane units in their main chain and featuring a thiol end group, were self-assembled to redox-active monolayers on gold. Electrochemical atomic force microscopy was employed to study the morphology of the monolayers as a function of the applied potential in situ. Surface plasmon resonance spectroscopy and spectroscopic ellipsometry measurements, performed under electrochemical control, indicated thickness changes of up to 15% upon oxidizing and reducing the surface-grafted polymers. X-ray reflectivity measurements unambiguously showed a thickness increase upon electrochemical oxidation of the monolayers. The reversible thickness change was attributed to stretching of the polymer chains upon oxidation due to an increase in charge density and to the attraction of counterions and associated solvent molecules, which are released when the polymer film is reduced to its neutral state.",

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year = "2004",

doi = "10.1021/la035656v",

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TY - JOUR

T1 - Electrochemically Induced Morphology and Volume Changes in Surface-Grafted Poly(ferrocenyldimethylsilane) Monolayers

AU - Péter, M.

AU - Hempenius, Mark A.

AU - Kooij, Ernst S.

AU - Jenkins, Toby A.

AU - Knoll, Wolfgang

AU - Vancso, Gyula J.

PY - 2004

Y1 - 2004

N2 - Poly(ferrocenyldimethylsilanes), composed of alternating ferrocene and dimethylsilane units in their main chain and featuring a thiol end group, were self-assembled to redox-active monolayers on gold. Electrochemical atomic force microscopy was employed to study the morphology of the monolayers as a function of the applied potential in situ. Surface plasmon resonance spectroscopy and spectroscopic ellipsometry measurements, performed under electrochemical control, indicated thickness changes of up to 15% upon oxidizing and reducing the surface-grafted polymers. X-ray reflectivity measurements unambiguously showed a thickness increase upon electrochemical oxidation of the monolayers. The reversible thickness change was attributed to stretching of the polymer chains upon oxidation due to an increase in charge density and to the attraction of counterions and associated solvent molecules, which are released when the polymer film is reduced to its neutral state.

AB - Poly(ferrocenyldimethylsilanes), composed of alternating ferrocene and dimethylsilane units in their main chain and featuring a thiol end group, were self-assembled to redox-active monolayers on gold. Electrochemical atomic force microscopy was employed to study the morphology of the monolayers as a function of the applied potential in situ. Surface plasmon resonance spectroscopy and spectroscopic ellipsometry measurements, performed under electrochemical control, indicated thickness changes of up to 15% upon oxidizing and reducing the surface-grafted polymers. X-ray reflectivity measurements unambiguously showed a thickness increase upon electrochemical oxidation of the monolayers. The reversible thickness change was attributed to stretching of the polymer chains upon oxidation due to an increase in charge density and to the attraction of counterions and associated solvent molecules, which are released when the polymer film is reduced to its neutral state.

KW - METIS-221799

KW - IR-59295

U2 - 10.1021/la035656v

DO - 10.1021/la035656v

M3 - Article

SN - 0743-7463

VL - 20

SP - 891

EP - 897

JO - Langmuir

JF - Langmuir

IS - 3

ER -