Synthesis and characterization of polyaniline/graphene composites
Development and characterization of composites of carbon nanotubes, conducting po...
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Author(s): |
Jadielson Lucas da Silva Antonio
Total Authors: 1
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Document type: | Doctoral Thesis |
Press: | São Paulo. |
Institution: | Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) |
Defense date: | 2016-07-08 |
Examining board members: |
Susana Ines Cordoba de Torresi;
Wendel Andrade Alves;
Mauro Bertotti;
Marystela Ferreira;
Thiago Regis Longo Cesar da Paixão
|
Advisor: | Susana Ines Cordoba de Torresi |
Abstract | |
The present work is focused on the study of the synthesis and characterization of conducting polymeric hydro-sponges structured by using methyl orange template. The syntheses of the hydro-sponges were performed by both chemical and electrochemical methods. Electro-swelling studies performed were with Polypyrrole hydro-sponges chemically synthezised, at macroscopic level (by volume change) and molecular level (by FTIR-ATR analysis) showing that the material behaves as a hydrogel presenting high ability to undergo large volume changes (until 40%) and to absorb high amounts of water. Regarding the electrochemical synthesis, the hydro-sponges thin films of polypyrrole and polyaniline of nanotubular shape were prepared. Morphological differences were analyzed according to the change in the synthesis parameters. For the polypyrrole films, a study of the growth of the three-dimensional structure was performed by using AFM analysis. A significant increase in the electrochemical properties with the increase of the spongy structure of polypyrrole was observed, leading to high electroactivity opening the possibility to be applied in supercapacitors (1220 F g-1). For the polyaniline films, a morphological, electrochemical and spectroscopic study was performed identifying the change of properties caused by the nanostructuring of the material. It was noted that the tubular shape of the polyaniline causes a conformational change in the polymer chain which reflects in the electrochemical properties, mainly due to the increase in the population of the charge carriers. (AU) | |
FAPESP's process: | 10/17511-0 - Conducting polymers hydrogels with potential applications for removing heavy metals from water and soils |
Grantee: | Jadielson Lucas da Silva Antonio |
Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |