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Electronic state of nitrogen containing polypyridine at the interfaces with model sulfonic acid containing polymer and molecule
Wong, K.Y..
Smallfield, J.A.O..
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry .
Epstein, A.J..
2003 (English)Conference paper, Published paper (Refereed)
Abstract [en]

We present results of an X-ray photoelectron spectroscopy (XPS) study of the interfaces between polypyridine (PPy) and model sulfonic acid containing polymer and molecule. We show that the N 1s level splits reflecting protonation of a substantial fraction of the PPy N sites. Density functional theory (DFT) is employed to compare excitation energies, bond angles, highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), and density of states of oligomers of pyridine and protonated pyridine. These results are in accord with the proposed origin of the red shift of the emitted light under forward bias in color-variable alternating-current light emitting (SCALE) devices.

Place, publisher, year, edition, pages
2003. Vol. 137, no 1-3, 1031-1032 p.
Keyword [en]
Density functional theory, Polymer-polymer interfaces, SCALE, Sulfonated polyaniline, X-ray photoelectron spectroscopy
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-46669DOI: 10.1016/S0379-6779(02)00890-1OAI: oai:DiVA.org:liu-46669DiVA: diva2:267565
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2010-09-07

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Fahlman, Mats

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