Covalent Layer-by-Layer Assembly of Redox-Active Polymer Multilayers

Xueling Feng, Aysegul Cumurcu, Xiaofeng Sui, Jing Song, Mark A. Hempenius, Gyula J. Vancso

Research output: Contribution to journalArticleAcademicpeer-review

29 Citations (Scopus)

Abstract

Poly(ferrocenyl(3-bromopropyl)methylsilane) and poly(ethylene imine) are employed in a layer-by-layer deposition process to form covalently connected, redox-active multilayer thin films by means of an amine alkylation reaction. The stepwise buildup of these multilayers on silicon, ITO, and quartz substrates was monitored by UV–vis absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), static contact angle measurements, surface plasmon resonance (SPR), atomic force microscopy, ellipsometry, and cyclic voltammetry, which provide evidence for a linear increase in multilayer thickness with the number of deposited bilayers. Upon oxidation and reduction, these covalently interconnected layers do not disassemble, in contrast to poly(ferrocenylsilane) (PFS) layers featuring similar backbone structures that are held together by electrostatic forces. The PFS/PEI multilayers are effective for the electrochemical sensing of ascorbic acid and hydrogen peroxide and show improved sensing performance at higher bilayer numbers. These covalently linked layers are readily derivatized further and can therefore be regarded as a versatile platform for creating robust, tailorable, redox-active interfaces with applications in sensing and biofuel cells
Original languageEnglish
Pages (from-to)7257-7265
Number of pages9
JournalLangmuir
Volume29
Issue number24
DOIs
Publication statusPublished - 2013

Keywords

  • METIS-299806
  • IR-90056

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