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Under mild pH conditions (pH 3), TSPP forms aggregates when CNTs are dispersed in an aqueous solution containing positively charged polyelectrolytes such as poly\u2010<jats:sc>L<\/jats:sc>\u2010lysine (PLL) or poly(allylamine hydrochloride) (PAH). Evidence for the geometry of the porphyrin aggregates is obtained from absorption spectra, whereby the fingerprints of J\u2010 and H\u2010aggregates are clearly seen only in the presence of smaller\u2010diameter nanotubes. J\u2010aggregates are better stabilized with PLL, whereas in the presence of PAH mainly H\u2010aggregates prevail. Excited\u2010state interactions within these nanohybrids are studied by steady\u2010state and time\u2010resolved fluorescence. The porphyrin emission intensity in the nanohybrid solution is significantly quenched compared to that of TSPP alone, and this implies strong electronic interaction between CNTs and porphyrin molecules. Fluorescence lifetime imaging microscopy (FLIM) further supports that porphyrin arrays are associated with the MWCNT sidewalls wrapped in PLL. In the case of the SWCNT hybrid, spherical structures associated with longer fluorescence lifetime appeared after one week, indicative of H\u2010aggregates of TSPP. The latter are the result of \u03c0\u2013\u03c0 stacking of porphyrin units on neighboring nanotubes facilitated by the strong tendency of these nanotubes to interact with each other. These results highlight the importance of optimum dimensions and surface\u2010area architectures of CNTs in the control\/stability of the porphyrin aggregates with promising properties for light harvesting.<\/jats:p>","DOI":"10.1002\/cphc.201200428","type":"journal-article","created":{"date-parts":[[2012,8,10]],"date-time":"2012-08-10T07:26:50Z","timestamp":1344583610000},"page":"3622-3631","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Polyelectrolyte\u2010Assisted Noncovalent Functionalization of Carbon Nanotubes with Ordered Self\u2010Assemblies of a Water\u2010Soluble Porphyrin"],"prefix":"10.1002","volume":"13","author":[{"given":"Suzana M.","family":"Andrade","sequence":"first","affiliation":[]},{"given":"Perumal","family":"Raja","sequence":"additional","affiliation":[]},{"given":"Vipin K.","family":"Saini","sequence":"additional","affiliation":[]},{"given":"Ana S.","family":"Viana","sequence":"additional","affiliation":[]},{"given":"Philippe","family":"Serp","sequence":"additional","affiliation":[]},{"given":"S\u00edlvia M. 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