Graphene oxide (GO) powder processed by Hummer's method is mixed with p-type Bi2Te3 based thermoelectric materials by a high-energy ball milling process. The synthesized GO-dispersed p-type Bi2Te3 composite powder has a composition of Bi0.5Sb1.5Te3 (BSbT), and the powder is consolidated into composites with different contents of GO powder by using the spark plasma sintering (SPS) process. It is found that the addition of GO powder significantly decreases the thermal conductivity of the pure BSbT material through active phonon scattering at the newly formed interfaces. In addition, the electrical properties of the GO/BSbT composites are degraded by the addition of GO powder except in the case of the 0.1 wt% GO/BSbT composite. It is found that defects on the surface of GO powder hinder the electrical transport properties. As a result, the maximum thermoelectric performance (ZT value of 0.91) is achieved from the 0.1% GO/BSbT composite at 398 K. These results indicate that introducing GO powder into thermoelectric materials is a promising method to achieve enhanced thermoelectric performance due to the reduction in thermal conductivity.

1. 서 론
 2. 실험방법
 3. 결과 및 고찰
 4. 결 론
 감사의 글
 References

• 김경태(한국기계연구원 부설 재료연구소, 분말기술연구실) | Kyung Tae Kim Corresponding Author
• 민태식(한국기계연구원 부설 재료연구소, 분말기술) | Taesik Min
• 김동원(한국기계연구원 부설 재료연구소, 분말기술연구실) | Dong Won Kim