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pH-Stat Control and High Resolution Electron Microscopy of Multi-Layered Polyaniline Nanofibers and Nanosheets

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Abstract:

A novel synthesis strategy that allowed for the first fabrication and observation of a self-assembled triple-layer polyaniline nanowire is described in this communication. This addresses a need in future electronics applications for molecular-scale and nano-scale conducting polymer wires featuring complex multilayer architectures. Our technique was underpinned by a modification of the well-established process of “falling-pH” chemical oxidative polymerization of aniline, normally yielding polyaniline nanowires, which we then combined with the recently discovered process of oligoaniline nanosheet curling. The morphology was examined in detail using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and allowed for the identification of several key behaviors, including nanosheets of increasing thickness as a function of time, nanowires and nanotubes of increasing length, and the appearance of a granular-texture polyaniline layer. The final result featured a 100 nm polyaniline core sheathed by a 10 nm oligoanilinic external layer, which indicates the potential for unique electrochemical characteristics.

Keywords: ELECTRON MICROSCOPY; NANOFIBERS; NANOFLAKES; NANOTUBES; PH-STAT; POLYANILINE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jamr.2011.1051

Publication date: February 1, 2011

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  • Journal of Advanced Microscopy Research (JAMR) provides a forum for rapid dissemination of important developments in high-resolution microscopy techniques to image, characterize and analyze man-made and natural samples; to study physicochemical phenomena such as abrasion, adhesion, corrosion and friction; to perform micro and nanofabrication, lithography, patterning, micro and nanomanipulation; theory and modeling, as well as their applications in all areas of science, engineering, and medicine.
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