Interface Engineering for High-Performance Thermoelectric Carbon Nanotube Films
Ying Zhou, Qingshuo Wei, Minfang Zhang, H. Nakajima, Toshiya Okazaki, Takeo Yamada, Kenji Hata
Abstract
Carbon nanotubes (CNTs) stand out for their exceptional electrical, thermal, and mechanical attributes, making them highly promising materials for cutting-edge, lightweight, and flexible thermoelectric applications. However, realizing the full potential of advanced thermoelectric CNTs requires precise management of their electrical and thermal characteristics. This study, through interface optimization, demonstrates the feasibility of reducing the thermal conductivity while preserving robust electrical conductivity in single-walled CNT films. Our findings reveal that blending two functionalized CNTs offers a versatile method of tailoring the structural and electronic properties of CNT films. Moreover, the modified interface exerts a substantial influence over thermal and electrical transfer, effectively suppressing heat dissipation and facilitating thermoelectric power generation within CNT films. As a result, we have successfully produced both p- and n-type thermoelectric CNTs, attaining impressive power factors of 507 and 171 μW/mK 2 at room temperature, respectively. These results provide valuable insights into the fabrication of high-performance thermoelectric CNT films.