Optimization of Separation Process for High-Purity Semiconducting Carbon Nanotubes using Polyfluorene-Based Conjugated Polymers and Its Application to High-Performance Field-Effect Transistors
발표자
유창우 (공주대학교 천안공과대학 신소재공학과)
연구책임자
이승훈 (공주대학교)
초록
내용
This investigation optimized the separation of intrinsic semiconductor/metallic mixtures of single-walled carbon nanotubes (SWNTs) using polyfluorene-based polymers for small-diameter (HiPco) and large-diameter (plasma torch) tubes. By precisely controlling polymer concentration, sonication time, and temperature, the critical trade-offs between yield-purity and dispersion-damage were balanced to establish optimal conditions for each system. The optimized process yielded >99% pure s-SWNTs, enabling high-performance field-effect transistors (FETs). FETs from large-diameter SWNTs achieved a high electron mobility of 43.6 cm²V⁻¹s⁻¹, while those from small-diameter SWNTs showed an excellent ON/OFF ratio of 10⁶. This work proves that a tailored strategy, matching the polymer-SWNT system and process to the target device characteristics, is essential for developing next-generation electronics.