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Authors
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Hermsdorf, N. ; Stamm, M. ; Förster, S. ; Cunis, S. ; Funari, S. ; Gehrke, R. ; Müller-Buschbaum, P.
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Title
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Self-Supported Particle-Track-Etched Polycarbonate Membranes as Templates for Cylindrical Polypyrrole Nanotubes and Nanowires: An X-ray Scattering and Scanning Force Microscopy Investigation
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Date
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15.12.2005
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Number
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13748
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Abstract
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Self-supported particle-track-etched polycarbonate membranes with nearly perfect cylindrical pores areused for the preparation of similarly perfect cylindrical polypyrrole nanowires and nanotubes. A completeinvestigation of the structural properties that result at different stages of the preparation route of polypyrrolenanowires and nanotubes is based on a combination of real and reciprocal space techniques. Nanoporousmembranes with nominal pore size ranging from 5 to 150 nm and pore density up to 10<SUP>9</SUP> pores/cm<SUP>2</SUP> madefrom 21-<IMG SRC="/images/entities/mgr.gif">m-thick polycarbonate films are used. Polypyrrole nanotubes or nanowires are synthesized insidethe pores. A real-space picture of the nanomaterial results from scanning force microscopy (SFM) onultrathin sections made in two directions to obtain structures in the sample surface as well as perpendicularto the surface. From a model-based fit to the small-angle and ultra-small-angle X-ray scattering (SAXS/USAXS) data, the geometric pore structure is obtained and compared to values determined with <br />scanningelectron microscopy (SEM). Nanopores, nanowires, and nanotubes are described by uniform solid cylindersor hollow tubes, which are oriented highly parallel to each other and exhibit a small size distribution.Below a critical pore diameter, solid nanowires are produced whereas above this limit hollow nanotubesresult.
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Publisher
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Langmuir
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Wikidata
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Citation
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Langmuir 21 (2005) 11987-11993
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DOI
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https://doi.org/10.1021/la0515975
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Tags
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mesoporous alumina membranes electrochemical synthesis pattern-formation phase-separation nanomaterials films morphology wires
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