In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2018-02, No. 19 ( 2018-07-23), p. 764-764
Abstract:
The intra-molecular transport along conjugated polymers has long been obscured by the dominant inter-molecular transport. To understand this important aspect of conjugated polymers, we have grown poly(3-methylthiophene) polymer brush films on indium tin oxide up to 120 nm thick. The morphological, structural, and electrical properties of such P3MT films were investigated. Optical and X-ray spectroscopy experiments indicate that the polymer chains have a nearly isotropic average orientation at low ( 〈 10 nm) and high ( 〉 30 nm) thicknesses, with mild vertical anisotropy in between. Atomic force microscopy shows that the film surfaces consist of column-shaped domains with an average cross-sectional area (2.3 × 10 -3 µm 2 ) and density (200 µm -2 ) that are independent of film thickness. Analysis of the contact between printed Au electrodes and the polymer brush film shows that a small fraction of the film surface (i.e., the tallest columns) makes contact with the electrodes. The measured bulk resistivity along the columns is 1.4 × 10 5 Ω·cm, two orders of magnitude lower than typical values for spuncast poly(3-alkylthiophene) films, while the resistance along individual polymer chains in the columns is estimated to be 360 GΩ/nm per molecule, comparable to molecular wires that exhibit charge transport by intramolecular processes. The enhanced conduction is likely due to additional intramolecular transport pathways enabled by the electrode-polymer brush-electrode device architecture, establishing conjugated polymer brushes as a platform for studying the interplay between synthesis, morphology, and charge transport phenomena. Figure 1
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2018-02/19/764
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2018
detail.hit.zdb_id:
2438749-6
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