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Published on: January 8, 2016
Conductivity of poly(pyrrole)-poly(styrene sulfonate) core-shell nanoparticles
Konstantinos Mpoukouvalas1, Jianjun Wang, Gerhard Wegner
1Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany.
Summary
The conductivity of poly(styrene) nanoparticles with polypyrrole shells can be tuned by changing the inorganic counter ions in the poly(styrene sulfonate) brushes. This modification influences charge transport in potential organic light-emitting diode materials.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Poly(styrene) nanoparticles with poly(styrene sulfonate) brushes loaded with polypyrrole exhibit core-shell morphology.
- These materials are investigated for their potential use as hole-injection layers in organic light-emitting diodes (OLEDs).
- Previous research focused on the effect of polypyrrole volume fraction on conductivity.
Purpose of the Study:
- To investigate how modifying the mobile inorganic counter ions of poly(styrene sulfonate) affects the dielectric properties and conductivity of polypyrrole-loaded nanoparticles.
- To understand the charge transport mechanisms in these core-shell nanoparticles.
Main Methods:
- Impedance spectroscopy was used to study thin compressed pellets of the nanoparticles.
- Measurements were conducted over a temperature range of 123–453 K and a frequency range of 10⁻¹–10⁶ Hz.
- The study examined nanoparticles with free-acid (H⁺) and Li⁺, Na⁺, Cs⁺ salts of poly(styrene sulfonate).
Main Results:
- The conductivity of the polypyrrole/poly(styrene sulfonate) core-shell nanoparticles is significantly influenced by the type of inorganic counter ion present.
- A transition from insulating to conducting behavior was observed between 300–350 K for all samples containing polypyrrole.
- The fluctuation-induced tunneling model was applied to estimate the average tunneling distance and potential energy barrier between conducting grains.
- The charge carrier localization length was determined to be approximately 0.33 nm.
Conclusions:
- The choice of inorganic counter ions in the poly(styrene sulfonate) shell provides a method to tune the electrical conductivity of polypyrrole-loaded nanoparticles.
- The findings offer insights into charge transport mechanisms, relevant for optimizing materials for organic electronics.
- The study highlights the importance of ion exchange in controlling the dielectric and conductive properties of these nanostructured materials.
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