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A simple fast microwave-assisted synthesis of thermoelectric bismuth telluride nanoparticles from homogeneous reaction-mixture |
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| Authors: | Susmita Pradhan Rashmita Das Radhaballabh Bhar Rajib Bandyopadhyay Panchanan Pramanik |
| Affiliation: | 1.Department of Instrumentation Science,Jadavpur University,Kolkata,India;2.Department of Instrumentation and Electronics Engineering,Jadavpur University,Kolkata,India;3.Department of Chemistry and Nanoscience,GLA University,Mathura,India |
| Abstract: | A new simple chemical method for synthesis of nanocrystalline bismuth telluride (Bi2Te3) has been developed by microwave assisted reduction of homogeneous tartrate complexes of bismuth and tellurium metal ions with hydrazine. The reaction is performed at pH 10. The nano-crystallites have rhombohedral phase identified by XRD. The size distribution of nanoparticle is narrow and it ranges between 50 to 70 nm. FESEM shows that the fine powders are composed of small crystallites. The TEM micrographs show mostly deformed spherical particles and the lattice fringes are found to be 0.137 nm. Energy dispersive X-ray spectroscopy (EDX) analysis shows the atomic composition ratio between bismuth and tellurium is 2:3. Thermoelectric properties of the materials are studied after sintering by spark plasma sintering method (SPS). The grain size of the material after sintering is in the nanometer range. The material shows enhanced Seebeck coefficient and electrical conductivity value at 300 K. The figure of merit is found to be 1.18 at 300 K. Graphical Abstract ? |
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