Document Detail


Covalent layer-by-layer assembly of redox active polymer multilayers.
MedLine Citation:
PMID:  23311998     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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 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.
Authors:
Xueling Feng; Aysegul Cumurcu; Xiaofeng Sui; Jing Song; Mark A Hempenius; G Julius Vancso
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-13
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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