| 학회 | 한국재료학회 |
| 학술대회 | 2013년 가을 (11/06 ~ 11/08, 제주롯데호텔) |
| 권호 | 19권 2호 |
| 발표분야 | C. 에너지/환경 재료(Energy and Environmental Materials) |
| 제목 | Synthesis of highly anisotropic (Bi,Sb)2Te3 with massively synthesized Te nanowires for thermoelectric materials |
| 초록 | Thermoelectrics has been researched as the technology of renewable energy to overcome energy crisis and global warming which humankind is facing. Thermoelectric generator is able to improve the energy efficiency through waste heat recovery. In addition, thermoelectric cooling system can reduce greenhouse effect because no refrigerant is necessary for operation. The effort to increase thermoelectric properties has been mostly focused on reducing the thermal conductivity by the phonon scattering effect at grain boundaries which can be enhanced by nanostructuring. This nanostructuring has been usually aceived by the combination of sintering with high energy ball milling, chemical or hydrothermal method. However, these isotropic nanostructuring techniques have a disadvantage of occurring the charge carrier scattering as well as the phonon scattering at grain boundaries, even though the electrical conductivity could be increased in isotropic nanostructures by the quantum confinement effect. In order to reduce carrier scattering with maintaining the phonon scattering, the internal nanostructure has to be ordered anisotropic. In this research, we synthesized (Bi,Sb)2Te3 alloys with maximizing anisotropic internal structure. Te nanowires were massively synthesized from TeO2 powders by chemical method at high temperature. Massive Te nanowires were used as templates for BiSbTe alloying. Bi and Sb nanopowders were obtained by conventional high energy ball milling (attrition mills). These three elements were then sintered with SPS (Spark Plasma Sintering). The stoichiometric (Bi,Sb)2Te3 alloy and anisotropic internal structures were confirmed in the sintered samples by XRD analysis and TEM observations. |
| 저자 | Sungho Seo1, Sanghyun Lee2, Yu Sun3, Minwook Oh4, Youngkeun Jeong5, Bongyoung Yoo2 |
| 소속 | 1Department of Bionanotechnology, 2Hanyang Univ., 3Ansan, 4Gyeonggi-do, 5Department of Metallurgy & Materials Engineering |
| 키워드 | Thermoelectric; BiSbTe; Te nanowire; anisotropic structure; SPS |
