ISSN:
1662-9779
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Physik
Notizen:
Meso-tetra (4-sulfonatophenyl) porphine (TPPS4) is water-soluble tetrapyrrolic dye,which forms self assembled nanostructures – J-aggregates under appropriate conditions. It wasshown, that such aggregates survive dried on the substrate. The spatial structure of TPPS4 Jaggregatesformed in acidic aqueous solutions and dispersed on silicon substrates was analyzed bymeans of atomic force microscopy (AFM). The stripe-like structures were observed. The size ofindividual stripes ranged 4,5×40×(200-1000) nm (H×W×L). The width and height was almost thesame for all stripes and independent upon the concentration of the solution, however the length wasstatistically distributed and the mean length increased with increasing concentration of initial TPPS4solution. At higher concentrations such stripes stacked into thicker fibers containing 2-20 stripes.Such fibers branched and formed large bush-like structures sized up to several millimeters.According to experimental findings the model of mesostructures, formed by TPPS4 J-aggregates,was proposed
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/26/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.97-98.191.pdf
