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Fabrication of Organized Porphyrin‐Nanotube‐Attached Heat‐Sensitive Polyelectrolyte Capsules
Author(s) -
Sadasivan S.,
Köhler K.,
Sukhorukov G. B.
Publication year - 2006
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200600189
Subject(s) - porphyrin , polyelectrolyte , materials science , chemical engineering , transmission electron microscopy , layer by layer , scanning electron microscope , nanotube , confocal microscopy , fluorescence spectroscopy , fluorescence , nanotechnology , polymer , carbon nanotube , layer (electronics) , photochemistry , composite material , chemistry , optics , physics , engineering
Abstract A facile method of connecting fluorescent meso ‐tetrakis(4‐sulfonatophenyl)porphine tetranion nanotubes to polyelectrolyte capsules is developed. Heat‐sensitive robust polyelectrolyte capsules consisting of poly(diallyldimethylammonium chloride) and poly(styrene sulfonate) multilayers have been fabricated using the conventional layer‐by‐layer technique. Supramolecular aggregation of porphyrin monomers to nanotubes is induced in the microenvironment of the capsules by sequential addition of salt and acid. Scanning electron microscopy, transmission electron microscopy, and atomic force microscopy images reveal satellite‐like structures consisting of a central capsule core with porphyrin nanotubes emerging radially from the capsule walls. The growth and the distribution of the porphyrin units have been monitored by UV‐vis spectroscopy, fluorescence spectroscopy, and confocal laser scanning microscopy. Changing the temperature alters the dimensions and the arrangement of the nanotubes on the capsule walls. Such an attachment of porphyrin tubes onto robust functional capsules should help in developing an artificial light‐harvesting system.