| 학회 | 한국재료학회 |
| 학술대회 | 2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 | 22권 2호 |
| 발표분야 | C. 에너지 재료 분과 |
| 제목 | Enhanced thermoelectric performance of flexible Bi2Te3 nanowire – PEDOT:PSS composite |
| 초록 | Thermoelectric (TE) materials, which exhibit capability to convert heat to electricity vice versa, have received wide attention drastically due to the world’s demand for sustainable and eco-friendly energy. Especially, organic or organic-inorganic hybrid TE materials with high electrical conductivity and low thermal conductivity have been intensively studied due to their advantages such as flexibility, light weight, low-cost, and mass production. However, these TE materials typically show poor thermoelectric figure of merit (ZT) value due to their low Seebeck coefficient in comparison to recent inorganic materials whose ZT is more than around 1. Various studies to enhance the thermoelectric properties have been carried out; however, the ZT value are reported to be less than 0.5 at room temperature. In this work, we fabricated Bi2Te3 nanowire using vapor-liquid-solid (VLS) method, and then combine poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) conducting polymer matrix through spin coating. A few nanometer scaled nanowires facilitate that electrons can move one dimensionally by quantum confinement effect. PEDOT:PSS matrix with high electrical conductivity provide low thermal conductivity. Bi2Te3 nanowire-PEDOT:PSS interfaces play a role of phonon glass by decreasing thermal conductivity without reduction of electrical conductivity. We reveal that structure of composite have nanometers scaled nanowires and Bi2Te3/PEDOT:PSS interface by measuring scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The highest ZT value was optimized by changing nanowire density in PEDOT:PSS matrix. Our study suggests that the nanometer-scaled nanowires and conducting polymer matrix composite is a promising structure for flexible thermoelectric materials with high thermoelectric performance. |
| 저자 | Wan Sik Kim1, Gopinathan Anoop2, Hyun Myung Lee1, Gi Won Goo2, Ji Young Jo1 |
| 소속 | 1School of Materials Science and Engineering, 2Gwangju Institute of Science and Technology |
| 키워드 | Flexible thermoelectric; Bi<SUB>2</SUB>Te<SUB>3</SUB>nanowire; conducting polymer |
