Lecture R. Augulis
|14 May 2004||FWN-Building 5113.0201, Nijenborgh 4, 9747 AG, Groningen|
|Speaker:||Drs. R. Augulis|
|Affiliation:||Department of Quantum Electronics, Physics Faculty, Vilnius University, Lithuania|
|Title:||Spatial structure and physical properties of TPPS4 aggregates|
|Date:||Fri May 14, 2004|
|Host:||P.H.M. van Loosdrecht|
|Telephone:||+31 50 363 8149 / 4974 (secr.)|
The realization of molecule-based miniature devices with advanced functionalities requires the development of new and efficient approaches for combining molecular building blocks into desired functional structures. The design of novel nano-devices through self-assembly is a perspective direction of nano-technology.
Quite a long time ago it was noticed, that TPPS4 (meso-tetra(4-sulfonato-phenyl)porphine) in acidic aqueous solutions self-assembles into aggregates. Such aggregates are usually recognized as J-type aggregates. Although much is known about the spectroscopic features and aggregation dynamics of TPPS4 aggregates, the spatial structure of such aggregates is not clearly revealed yet. For examination of the spatial structure and physical properties of TPPS4 aggregates we have applied linear and non-linear spectroscopy, AFM and X-Ray scattering techniques as well as theoretical modelling. The obtained results reveal that TPPS4 self-assembles into long (up to several microns) single-walled nanotubes with diameter of ca. 20 nm. These nanotubes are rather stable on different substrates in ambient air, which is essential for applications of TPPS4 aggregates in fabrication of organic optoelectronic devices.
|Last modified:||22 October 2012 2.30 p.m.|