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The solid-state organization of 'self-doped' PPV oligomers
Yun Ling1, Piotr Kozakiewicz, Frank Blockhuys
1University of Antwerp, Department of Physics, Universiteitsplein 1, B-2610 Antwerp, Wilrijk, Belgium.
Physical Chemistry Chemical Physics : PCCP
|September 29, 2011
Summary
Electrochemical doping of self-doped poly(p-phenylene vinylene) oligomers creates isolated positive polarons. Ageing may lead to oligomer stacking, impacting material organization.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Spectroscopy
Background:
- Poly(p-phenylene vinylene) (PPV) oligomers are investigated for their electronic properties.
- Understanding the solid-state organization of doped oligomers is crucial for device applications.
Purpose of the Study:
- To investigate the solid-state organization of self-doped PPV oligomers.
- To elucidate the nature of charge carriers generated by electrochemical doping.
- To compare electrochemical and chemical oxidation methods.
Main Methods:
- Multi-frequency Electron Paramagnetic Resonance (EPR) spectroscopy
- Nuclear Magnetic Resonance (NMR) spectroscopy
- Density Functional Theory (DFT) quantum-chemical calculations
Main Results:
- Electrochemical doping yields a high concentration of positive polarons.
- Magnetically isolated polarons are observed, indicating specific spatial distribution.
- Differences between chemical and electrochemical oxidation pathways are detailed.
- Oligomer stacking is observed during the ageing of electrochemically oxidized samples.
Conclusions:
- Electrochemical self-doping of PPV oligomers effectively generates polarons.
- The study provides insights into the structural and electronic properties of doped PPV oligomers in the solid state.
- Ageing-induced stacking suggests potential for morphological changes affecting material properties.
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