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- W2000473442 abstract "Poly(styrene) nanoparticles decorated at their surface with poly(styrene sulfonate) brushes and subsequently loaded with polypyrrole have been prepared as film-forming materials to serve as hole injection layers in organic light-emitting diodes. Thin compressed pellets of these nanoparticles have been studied by impedance spectroscopy. Measurements were carried out in the temperature range between 123.15 and 453.15 K and frequency range from 10−1 to 106 Hz. The polypyrrole volume fraction φPPy was varied as well. The film-forming nanoparticles exhibit a core-shell-type morphology with a core of electrically insulating poly(styrene) and a shell consisting of a corona of poly(styrene sulfonate) chains, which form the matrix in which the electrically conducting complex of polypyrrole and poly(styrene sulfonate) is embedded. This conducting complex exists in forms of domains with nanoscale dimensions. It is demonstrated that the charge transport in samples with φPPy [for the calculation of the polypyrrole volume fractions the poly(styrene) volume was excluded] lower than 0.52 is dominated by ionic conductivity. At higher volume fractions the charge transport is mainly electronic in nature. The fluctuation-induced tunneling model can be used to describe the temperature dependence of the dc conductivity. For a sample with φPPy of 0.52, a transition from insulating to conducting behavior at 385 K has been found. An electrical percolating behavior has been observed with a percolation threshold at φPPy of 0.65, suggesting that polypyrrole rich and poor domains are present in the poly(styrene sulfonate) matrix and indicating a “transition” from electronically insulating to conducting behavior. A detailed analysis of the impedance spectra suggests a lower limit of the conducting domains of 2.5 nm." @default.
- W2000473442 created "2016-06-24" @default.
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- W2000473442 date "2009-09-15" @default.
- W2000473442 modified "2023-09-27" @default.
- W2000473442 title "Impedance spectroscopy investigation of conjugated polymer coated core-shell nanoparticles" @default.
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- W2000473442 doi "https://doi.org/10.1063/1.3223324" @default.
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