Effect of Surfactant Addition on Bi2Te3 Nanostructures Synthesized by Hydrothermal Method
| Autor: | Babu Madavali, Soon-Jik Hong, Chung-Sik Lee, Peyala Dharmaiah |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
lcsh:TN1-997
Nanostructure Materials science Spark plasma sintering 02 engineering and technology 010402 general chemistry 01 natural sciences Hydrothermal circulation chemistry.chemical_compound Pulmonary surfactant lcsh:TA401-492 Hydrothermal synthesis Bismuth telluride lcsh:Mining engineering. Metallurgy thermoelectric materials Metals and Alloys 021001 nanoscience & nanotechnology Thermoelectric materials X-ray diffraction 0104 chemical sciences hydrothermal synthesis chemistry Chemical engineering X-ray crystallography lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology spark plasma sintering |
| Zdroj: | Archives of Metallurgy and Materials, Vol 62, Iss 2, Pp 1005-1010 (2017) |
| ISSN: | 2300-1909 |
| DOI: | 10.1515/amm-2017-0142 |
| Popis: | In the present work, we have prepared Bi2Te3nanostructures with different morphologies such as nano-spherical, nanoplates and nanoflakes obtained using various surfactant additions (EG, PVP, and EDTA) by a hydrothermal method. The shape of the nanoparticles can be controlled by addition of surfactants. The samples were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). It is found that the minority BiOCl phase disappears after maintained pH at 10 with EG as surfactant. SEM bulk microstructure reveals that the sample consists of fine and coarse grains. Temperature dependence of thermoelectric properties of the nanostructured bulk sample was investigated in the range of 300-450K. The presence of nanograins in the bulk sample exhibits a reduction of thermal conductivity and less effect on electrical conductivity. As a result, a figure of merit of the sintered bulk sample reached 0.2 at 400 K. A maximum micro Vickers hardness of 102 Hv was obtained for the nanostructured sample, which was higher than the other reported results. |
| Databáze: | OpenAIRE |
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