We herein report the results of a facile two-step surfactant assisted reflux synthesis of bismuth telluride (Bi2Te3) nanowires. The as-synthesised nanowires had diameters ranging from 70- 110 nm with a length varying between 0.4 and 3 µm and a preferential lattice orientation of (0 1 5) as determined by grazing incidence x-ray diffraction (GIXRD). We demonstrate for the first time that a solvent/binder paste formulation of N-methyl-2-pyrrolidone (NMP)/ polyvinylidene fluoride (PVDF) is suitable for screen-printing the Bi2Te3 nanowires with the potential for the fabrication of flexible thermoelectric materials. The wt% of PVDF in the composite films was varied from 10% to 20% to identifiy the optimal composition with a view to achieving maximum film flexibility whilst retaining the best thermoelectric performance. The films were screen-printed onto Kapton substrates and subjected to a post-printing annealing process to improve thermoelectric performance. The annealed and screen printed Bi2Te3/PVDF nanowire compsites yielded a maximum Seebeck coefficient -192 µVK-1 with a power factor of 34 µW m-1 K-2 at 225 K. The flexible screen printed composite films were flexible and found to be intact even after 2000 bending cycles.
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