Hydrothermal Synthesis and Characterization of Nanostructured Thermoelecteric Material Bi2Te2.7Se0.3 and Bi0.88Sb0.12

• Main Author: 曹峻瑋
• Other Authors: 劉嘉吉
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/77302112555560009864

碩士 === 國立彰化師範大學 === 物理學系 === 96 === Bi2Te2.7Se0.3 and Bi0.88Sb0.12 nanopowders have been synthesized by hydrothermal method. Measuring their X-ray diffraction, resistivity, Seebeck coefficient, Hall effect and thermal conductivity. Change the experiment parameter to improve their thermoelectric properties. In Bi2Te2.7Se0.3 series, we hope to improve thermoelectric properties of B i2Te2.7Se0.3 by doping submicron carbon sphere, changing hydrothermal temperature and making nano-composite material. In the experiment, doping submicron carbon sphere and changing hydrothermal temperature can improve power factor of samples effectively. Although making nano- composite material can improve thermal conductivity and Seebeck coefficient, but resistivity also increases, for this reason, power factor and figure of merit are decreasing. The maximum power factor is 18.8 μW/K2-cm(hydrothermal temperature is 170°C for 24 hr; sinter temperature is 340°C for 10 hr). In Bi0.88Sb0.12 series, we change experiment parameter to improve thermoelectric properties of samples by using Taguchi method. In the experiment, the maximum power factor is 41.3 μW/K2-cm(hydrothermal temperature is 170°C for 48 hr; sinter temperature is 170°C for 10 hr).