Abstract
Abstract Depositing single-walled carbon nanotubes (SWNTs) with controllable density, pattern and orientation on electrodes presents a challenge in today’s research. Here, we report a novel solvent evaporation method to align SWNTs in patterns havingnanoscale width and micronscale length. SWNTs suspension has been introduced dropwise onto photoresist resin microchannels; and the capillary force can stretch and align SWNTs into strands with nanoscale width in the microchannels. Then these narrow and long aligned SWNTs patterns were successfully transferred to a pair of gold electrodes with different gaps to fabricate carbon nanotube field-effect transistor (CNTFET). Moreover, the electrical performance of the CNTFET show that the SWNTs strands can bridge different gaps and fabricate good electrical performance CNTFET with ON/OFF ratio around 106. This result suggests a promising and simple strategy for assembling well-aligned SWNTs into CNTFET device with good electrical performance.
Highlights
SWNTs have experienced rapid research and development since they were produced independently by Iijima and Bethune in 1993 [1,2]
The small diameter and long length of SWNTs can be used to fabricate carbon nanotube field-effect transistor (CNTFET) to replace silicon in nanoelectronic devices, where silicon and other standard semiconductors can not work in a molecular scale
A drop of SWNTs suspension was dripped into microchannels, and it spread and flowed into microchannels in a few seconds
Summary
SWNTs have experienced rapid research and development since they were produced independently by Iijima and Bethune in 1993 [1,2]. Some of these methods can align the carbon nanotubes in large scale area with micro-scale width, it is obviously difficult to fabricate a massively parallel or complex pattern with nano-scale width at precise location when applied in real siliconbased electronic nanodevice. When the dilute SWNTs suspension flow into microchannels, the capillary force can stretch and align carbon nanotubes one by one into a nanoscale strand.
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