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Preparation of aligned Fe3O4@Ag-nanowire/poly(vinyl alcohol) nanocomposite films via a low magnetic field |
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| Affiliation: | 1. Laboratoire de Physique de la Matière Condensée, Université de Nice-Sophia Antipolis, CNRS, UMR 7336, Parc Valrose, 06108 Nice Cedex 2, France;2. Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas – Centro de Tecnologia, Bl. J, Ilha do Fundão, 21941-598 Rio de Janeiro, RJ, Brazil;3. Société Pigm’Azur, 4 Boulevard de Cimiez, Le Majestic, 06000 Nice, France;1. Department of Chemical Engineering, Hanyang University, Seoul 133-791, Republic of Korea;2. Center for Next Generation Dye-sensitized Solar Cells, WCU Program Department of Energy Engineering, Hanyang University, Seoul 133-791, Republic of Korea;3. Department of Organic and Nano Engineering, Hanyang University, Seoul 133-791, Republic of Korea;1. Department of Electrical and Electronic Engineering, University of Hong Kong, Hong Kong;2. Department of Applied Physics, Hong Kong Polytechnic University, Hong Kong |
| Abstract: | Aligned Fe3O4@Ag-nanowire (Ag-NW)/poly(vinyl alcohol) (PVA) nanocomposite films are prepared via a magnetic field-assisted method under a low magnetic field (B < 0.1 T) induction. The effects of the mass ratio (MR) of Fe3O4 to Ag-NWs and the Ag-NW content are systematically studied on the composite electrical conductivity (EC). The preferential alignment of Ag-NWs brings about a significant increase in the EC of the oriented composite in the parallel direction along the magnetic field. The optimal MR is determined to be equal to 0.15 at which the random composite has a good EC meanwhile the oriented composite shows a good response to the applied magnetic field. The oriented composite with the 20 wt% Ag-NWs shows a high EC anisotropy of ca. 6.6 and a very high EC of 4500 S/cm via the external magnetic field. In addition, the introduction of Ag-NWs leads to an obvious improvement in the thermal stability of PVA composites. |
| Keywords: | B. Anisotropy B. Electrical properties B. Directional orientation Silver nanowire |
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