Single-walled carbon nanotube (SWNT) has attracted widespread attention due to their exceptional electrical, thermal, and mechanical properties. Many applications require SWNT alignment and placement with good controllability to achieve the expected performance. The authors report here a simple but effective approach for SWNT alignment, which is based on grating-guided electrostatic self-assembly (ESA) in a polymer template patterned by nanoimprint. SWNT stripes can be obtained by removing the polymer template after ESA. The SWNT stripes on the substrate show strong polarized Raman signal, which is indicative of a high-level alignment of the SWNTs in the stripes. The effect of surfactants on the guided ESA process is discussed. The advantages of this SWNT alignment technique are flexibility and scalability. As an easy-to-process approach, the SWNT alignment by grating-guided ESA may advance the practical applications of SWNTs in integrated microelectronic systems.

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