Purification of single-walled carbon nanotubes based on thermocapillary flow

Abstract eng:
Single-walled carbon nanotubes (SWNTs) grow as mixture of both metallic and semiconducting tubes and this heterogeneity fiustrates their practical use in high performance electronics. We will discuss the recently developed purification techniques based on nanoscale thermocapillary flow of thin film, which enables complete elimination of metallic SWNTs from as-grown arrays. We then studied the thermocapillary flow to purify SWNTs analytically and established a simple scaling law for the evolution of thin film thickness. It is found that the normalized thickness profile only depends on the normalized power density. The results may serve as useful design guidelines for process optimization.

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