Colloidal systems of silver nanoparticles and high-regioregular cationic polythiophene with ionic-liquid-like pendant groups: Optical properties and SERS

0354009 - ÚMCH 2011 RIV US eng J - Journal Article
Kazim, Samrana - Pfleger, Jiří - Procházka, M. - Bondarev, D. - Vohlídal, J.
Colloidal systems of silver nanoparticles and high-regioregular cationic polythiophene with ionic-liquid-like pendant groups: Optical properties and SERS.
Journal of Colloid and Interface Science. Roč. 354, č. 2 (2011), s. 611-619. ISSN 0021-9797. E-ISSN 1095-7103
R&D Projects: GA AV ČR KAN100500652; GA ČR GA203/07/0717
Institutional research plan: CEZ:AV0Z40500505
Keywords : ionic conjugated polymer * polythiophene polyelectrolyte * plasmonic nanoparticle
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 3.070, year: 2011

Structure dependent optical properties of colloidal systems of borate-stabilized silver nanoparticles (Ag NPs) and polythiophene-based cationic polyelectrolyte with ionic-liquid like side groups: poly{3-[6-(1-methylimidazolium-3-yl)hexyl]thiophene-2,5-diyl bromide} (PMHT-Br) towards obtaining local electromagnetic field enhancement effects. Surface-enhanced Raman scattering (SERS) studies showed that the strong electromagnetic field enhancement is related to the formation of aggregates of Ag NPs achieved at the components ratio providing the charge balance between Ag NPs and cationic polythiophene, at which Ag NPs are nearly single-polymer-layer coated, their zeta potential is close to zero and they easily form aggregates in which the mean inter-particle distance enables the occurrence of desired plasmonic effects. Fluorescence quenching is efficient only in the systems with low concentrations of PMHT-Br, in which almost all polymer chains directly interact with the Ag NPs surface.
Permanent Link: http://hdl.handle.net/11104/0193103