Abstract
Carbon nanotubes (CNTs) are ideal building blocks for future nanoelectronic devices. CNTs of different electrical properties, metallic and semiconducting, find applications in different fields. However, current techniques for growing CNTs yield CNT mixtures of both electrical types, which have limited the applications of CNTs in electronics. In this study, selective removal of multi-walled and metallic single-walled carbon nanotubes (MWNTs and m-SWNTs) from CNT mixtures was realized using controlled laser irradiations. Due to their sub-wavelength size and free electrons, electron motions and eddy currents can be generated and significantly enhanced by strong electric fields in laser beams and optical near field effects, resulting in selective heating and removing process. With this approach, samples of pure s-SWNT arrays were obtained. This technique provides a laser-based single-step approach for selectively removing MWNTs and m-SWNTs from CNT mixtures.
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