Molecular ordering in monolayers of an alkyl-Substituted perylene-bisimide dye by attenuated total reflectance ultraviolet-visible spectroscopy
2005 (English)In: Applied Spectroscopy, ISSN 0003-7028, Vol. 59, no 10, 1248-1256 p.Article in journal (Refereed) Published
Surface-relative orientational parameters were determined for monolayer films of N, N'-ditridecylperylenetetracarboxylic dianhydridediimide (C 13-PTCDI) in terms of the relative electronic transition dipole strengths, providing a three-dimensional view of the absorption dipole distribution. In order to obtain a macroscopically ordered film, C 13-PTCDI was deposited by (1) horizontal Langmuir-Blodgett (LB) transfer onto methyl- and phenyl-silanized glass, and (2) vapor deposition onto oriented films of poly(tetrafluoroethylene) (PTFE) on glass. Films of LB-deposited C13-PTCDI were found to be completely Isotropic prior to annealing. After annealing, these films remained isotropic in the plane of the substrate while the out-of-plane anisotropy was significantly enhanced. In contrast, films of C13-PTCDI vapor deposited onto oriented poly(tetrafluoroethylene) (PTFE)-modified substrates yielded films with a high degree of both in- and out-of-plane anisotropy. Atomic force microscopy (AFM) images of both the LB- and vapor-deposited films show substantial differences in film morphology and long-range order. These results demonstrate that molecular orientation in C13-PTCDI films can be controlled by varying substrate surface chemistry and post-deposition processing. © 2005 Society for Applied Spectroscopy.
Place, publisher, year, edition, pages
2005. Vol. 59, no 10, 1248-1256 p.
ATR, Attenuated total reflection, Molecular orientation, Perylene
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-50418DOI: 10.1366/000370205774430918OAI: oai:DiVA.org:liu-50418DiVA: diva2:271314