Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/23704
Title: Next generation of conducting materials for organic electronics
Authors: WEN TAO
Keywords: polyaniline, morphology, reverse micelle, microplate, current-voltage characteristics, hydrophobicity
Issue Date: 12-Aug-2010
Source: WEN TAO (2010-08-12). Next generation of conducting materials for organic electronics. ScholarBank@NUS Repository.
Abstract: One-pot synthesis of PANI micro and nano structures was conducted in toluene, by employing both cationic and non-ionic surfactants to form reverse micelles. The reverse micelles of cetyltrimethylammonium bromide (CTAB) led to mono-dispersed solid sub-microspheres. When trioctylmethylammonium chloride (TOAC) was used as the cationic surfactant, morphology evolution was readily observed. Various PANI micro and nano structures, including 1D open-ended microtubes, 3D solid microspheres and 2D novel solid microplates were controllably produced. In addition, the non-ionic surfactant trioctylamine (TOA) was used to produce PANI microstructures for the first time. The electrical properties of the prepared PANI solid sub-microspheres and microplates were investigated at room temperature by measuring their current-voltage (I-V) curves. The I-V curves of both an individual sub-microsphere and its macroscopic film showed semiconducting characteristics. I-V curves were also obtained for an individual microplate, two stacked microplates and the macroscopic film. For an individual plate, the current followed Ohm?s law at low voltages and power-law with exponent of 3/2 at high voltages. Large and non-Ohmic contact resistance between structures was shown to be the dominating factor in determining electrical properties of stacked microplates and microplate aggregates. PANI films with interesting hydrophobic properties were prepared by controlling the surface roughness due the co-existence of nano and micro spherical structures.
URI: http://scholarbank.nus.edu.sg/handle/10635/23704
Appears in Collections:Master's Theses (Open)

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