탄소나노튜브가 분산된 비스무스 텔루라이드 기지 복합재료의 제조 및 열전특성
Fabrication and Thermoelectric Properties of Carbon Nanotube/Bi2Te3 Composites
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Carbon-nanotube-embedded bismuth telluride (CNT/Bi2Te3) matrix composites were fabricated by a powder metallurgy process. Composite powders, whereby 5 vol.% of functionalized CNTs were homogeneously mixed with Bi2Te3 alloying powders, were successfully synthesized by using high-energy ball milling process. The powders were consolidated into bulk CNT/Bi2Te3 composites by spark plasma sintering process at 350oC for 10 min. The fabricated composites showed the uniform mixing and homogeneous dispersion of CNTs in the Bi2Te3 matrix. Seebeck coefficient of CNT/Bi2Te3 composites reveals that the composite has n-type semiconducting characteristics with values ranging -55 μV/K to -95 μV/K with increasing temperature. Furthermore, the significant reduction in thermal conductivity has been clearly observed in the composites. The results showed that CNT addition to thermoelectric materials could be useful method to obtain high thermoelectric performance.
Abstract
Carbon-nanotube-embedded bismuth telluride (CNT/Bi2Te3) matrix composites were fabricated by a powder metallurgy process. Composite powders, whereby 5 vol.% of functionalized CNTs were homogeneously mixed with Bi2Te3 alloying powders, were successfully synthesized by using high-energy ball milling process. The powders were consolidated into bulk CNT/Bi2Te3 composites by spark plasma sintering process at 350oC for 10 min. The fabricated composites showed the uniform mixing and homogeneous dispersion of CNTs in the Bi2Te3 matrix. Seebeck coefficient of CNT/Bi2Te3 composites reveals that the composite has n-type semiconducting characteristics with values ranging -55 μV/K to -95 μV/K with increasing temperature. Furthermore, the significant reduction in thermal conductivity has been clearly observed in the composites. The results showed that CNT addition to thermoelectric materials could be useful method to obtain high thermoelectric performance.
참고문헌 (10)
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