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  • 09월 12일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제110회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Recent Research Activities on Thermoelectric Materials : Phonon Controlled Nano-engineering

2012년 8월 30일 14시 30분 40초
KCS1-4 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 10시 : 45분
KCS-GDCh-Angewandte joint symposium - Solid State Chemistry
저자 및
이화여자대학교 화학과, Korea
I will review recent research activities on phonon controlled thermoelectric materials and show recent results of our research. As an example of phonon controllable nano-engineering strategy, metal nanoparticles can be embedded by intercalation in a layered material. We report the effect of Cu intercalation on the thermoelectric properties of Bi2Te3 in the series compounds of CuxBi2Te3 (0 ≤ x ≤ 0.1). Such metal nanoparticles acted as electron donors, changing the native p-type character of Bi2Te3 to n-type. They also acted as phonon scatters, reducing thermal conductivity. Cu0.07Bi2Te3 has high electrical conductivity of 681 S/cm and Seebeck coefficient of -236 μV/K with low thermal conductivity of 1.0 W/mK, thus enhancing the figure of merit, ZT, to 1.15 at approximately 300 K. This value is a 20% improvement over the peak ZT (0.9) of the current best-known value of n-type Bi2Te3. Such improvement arose from the formation of the Cu nanoparticles within the Bi2Te3 layers. Also, we will show a novel single step approach to fabricate nanoscaled heterophase interface in bulk thermoelectric materials through the bottom-up strategy and investigate their thermoelectric properties. This approach shows a simple synthetic route to construct energy filtering interfaces, thereby enhancing TE properties in bulk materials. The synthesized organic DDT and inorganic SnS44- capped Bi2Te3 nanoparticles were compacted into nanostructured bulk samples by spark plasma sintering. The densification behavior, microstructure, and phase formation of sintered samples were characterized.