Document Detail

pH-controlled assembly and properties of LbL membranes from branched conjugated poly(alkoxythiophene sulfonate) and various polycations.
MedLine Citation:
PMID:  20000796     Owner:  NLM     Status:  MEDLINE    
We report on multilayer layer-by-layer (LbL) films of the conjugated polymer sodium poly[2-(3-thienyl)ethyloxy-4-butylsulfonate] (PTH) assembled with polycations: poly(diallyldimethylammonium chloride) (PDDA), 20% quaternized poly(N-ethyl-4-vinylpyridinium bromide) (Q20), poly(ethylene imine) (PEI), and poly(allylamine hydrochloride) (PAH). These films were prepared through spin-assisted LbL assembly under various pH conditions. We demonstrated a crucial role of the deposition pH in formation of PTH/polycation films and showed that decrease in the deposition pH from 7.5 to 2.5 limits the PTH multilayer formation to Q20/PTH and PDDA/PTH films due to reduced charge density in the poly(thiophene) chains. We show that optical and surface properties of the resulting PTH/polycation films can be tuned by varying a polycation component and/or by varying the deposition pH. The fluorescence properties of the Q20/PTH, PEI/PTH, and PDDA/PTH films are pH-dependent, and the films exhibit the drastic changes in photoluminescent intensity when transferred into solutions with different pH values, which may find useful in optical sensing applications.
Veronika Kozlovskaya; Eugenia Kharlampieva; Keith Jones; Zhiqun Lin; Vladimir V Tsukruk
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  26     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-05-12     Completed Date:  2010-08-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7138-47     Citation Subset:  IM    
School of Materials Science and Engineering , Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
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MeSH Terms
Cations / chemistry
Hydrogen-Ion Concentration
Imines / chemistry*
Membranes, Artificial*
Molecular Structure
Particle Size
Polyamines / chemistry*
Polyethylenes / chemistry*
Polyvinyls / chemistry*
Quaternary Ammonium Compounds / chemistry*
Surface Properties
Thiophenes / chemistry*
Reg. No./Substance:
0/Cations; 0/Imines; 0/Membranes, Artificial; 0/Polyamines; 0/Polyethylenes; 0/Polyvinyls; 0/Quaternary Ammonium Compounds; 0/Thiophenes; 0/poly(2-(3-thienyl)ethyloxy-4-butylsulfonate); 0/poly(ethylene imine); 25619-82-3/poly-4-vinyl-N-ethylpyridine; 26062-79-3/poly-N,N-dimethyl-N,N-diallylammonium chloride; 30551-89-4/polyallylamine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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