Observation of ferroelectric response in conjugated polymer nanotubes

Majumdar, D.; Saha, S. K.
May 2010
Applied Physics Letters;5/3/2010, Vol. 96 Issue 18, p183113
Academic Journal
Long range charge delocalization usually inhibits ferroelectric response in conjugated polymers. We observe remarkable ferroelectric response (remnant polarization 2.8 μC cm-2) in polyaniline (PANI) nanotubes synthesized by oxidative polymerization technique in methanol medium using anodic alumina (AAO) template. Ferroelectricity in PANI nanotubes arises due to spontaneous polarization caused by hydrogen bonds, created due to charge transfer between methanol molecule and aligned polymer chain. Due to directional growth along the AAO nanochannel, PANI chains are well-aligned and all these dipoles associated with hydrogen bonds are arranged in regular order—exhibiting exceptional ferroelectric response. However, such effect is absent in bulk PANI.


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