NSTI Nanotech 2009

Study of Electrical Properties of Nanocomposites filled with Indium Tin Oxide Nanobelts

E.P.S. Arlindo, J.A. Lucindo, H.A. Aquino, M.O. Orlandi
Universidade Estadual Paulista, BR

Keywords: nanocomposites, electrical properties


Nanocomposites are materials that have two or more solid phases, and at least one of them should present one dimension below 100 nm. They are known as multifunctional materials because they have, usually, more than one property increased for some special application. Up to now, a great effort has been done by researches to achieve multifunctional nanocomposites of polymeric matrices filled with metallic, ceramic or inorganic phase, and in this work we studied the influence of conductive ITO (Indium Tin Oxide) nanobelts on the electrical properties of Poly(methyl methacrylate) polymer. The nanobelts were synthesized by carbothermal reduction process, using a co-evaporation method, and have controlled size, shape, and chemical composition. The electrical measurements of individual nanobelts showed they have a resistance of about 104-105 . In order to produce nanocomposites films, nanobelts were dispersed in toluene using an ultrasonic cleaner, so the PMMA polymer was added, and the system was kept under agitation up to a clear solution be obtained. The PMMA polymer was filled with 1, 2, 5 and 10 % in weight of nanobelts, and the films were done by tape casting. The results showed that the resistance of nanocomposites decreases by increasing the amount of filler, and with 5% in weight of nanobelts the resistance is about 105-107, which means that percolation of nanobelts occurs for this concentration. This is an interesting result once for nanocomposites filled with ITO nanoparticles is necessary about 18% in weight to obtain percolation. These results are promising once indicates that is possible to produce conductive films by the addition of ITO nanobelts in a polymeric matrix using a simple route.
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