Highly oriented POPOP films grown on the KCl(0 0 1) surface

Indexation scheme for oriented molecular thin films studied with grazing-incidence reciprocal-space mapping

“…The sample azimuth angle was oscillated by 60 during data collection in order to cover the azimuth range between the inplane [100] and [110] high-symmetry directions of the KCl(001) substrate. Observed reflections from oriented 1,4bis(5-phenyloxazol-2-yl)benzene (POPOP) crystallites on KCl(001) compare well with reflections measured with a point detector on a surface diffractometer in an earlier study (Smilgies et al, 2000).…”

“…For indexation we used the known (102) orientation of the POPOP planes parallel to the substrate surface. Using both the 20 most intense bulk reflections (Â symbols) as well as the observed thin film reflections reported by Smilgies et al (2000) (+ symbols) we can index most of the observed reflections. Some of the intense reflections had not been observed in the earlier surface diffraction study, which used a point detector and thus focused on the high-symmetry directions of the substrate.…”

Converting Wannier into Frenkel Excitons in an Inorganic/Organic Hybrid Semiconductor Nanostructure

“…3b, the ratio τ HB /τ QW deduced from the experimental transients is plotted versus d for five different hybrid structures together with a fit using the above model. Assuming a sheet density of 1.4•10 14 cm −2 of the POPOP molecules [16], best agreement is found for R 0 =2.6 nm. On the other hand, the Förster radius R 0 can also be calculated from spectroscopic quantities d ν [15].…”

Kinetic Signature of Fractal-like Filament Networks Formed by Orientational Linear Epitaxy

“…1). This process is observed in a broad range of systems, including collagens [5][6][7][8], various β-sheet forming peptides [9][10][11][12][13][14], and organic nanofibers [15][16][17][18][19][20]. Commonly used substrates include mica, graphite, and KCl, where assembly occurs either in solution (mainly biofilaments) or via vapor deposition (organic nanofibers).…”

“…1 (color online). Four types of OLE networks that have been experimentally observed: (a) Triaxial [8][9][10][11][12][13][14][15]18,19,21,27], (b) biaxial [5,6], (c) rectangular [16,17,28], and (d) isotropic [22][23][24][25][26]. (a),(b) Triaxial and biaxial form on hexagonal lattices, notably on mica.…”