Highly effective separation of semiconducting carbon nanotubes verified via short-channel devices fabricated using dip-pen nanolithography

ACS Nano
Steve ParkZhenan Bao

Abstract

We have verified a highly effective separation of semiconducting single-walled carbon nanotubes (sc-SWNTs) via statistical analysis of short-channel devices fabricated using multipen dip-pen nanolithography. Our SWNT separation technique utilizes a polymer (rr-P3DDT) that selectively interacts with and disperses sc-SWNTs. Our devices had channel lengths on the order of 300-500 nm, with an average of about 3 SWNTs that directly connected the source-drain electrodes. A total of 140 SWNTs were characterized, through which we have observed that all of the SWNTs exhibited semiconducting behavior with an average on/off current ratio of ~10(6). Additionally, we have characterized 50 SWNTs after the removal of rr-P3DDT, through which we have again observed semiconducting behavior for all of the SWNTs with similar electrical characteristics. The relatively low average on-conductance of 0.0796 μS was attributed to the distribution of small diameter SWNTs in our system and due to the non-ohmic Au contacts on SWNTs. The largely positive threshold voltages were shifted toward zero after vacuum annealing, indicating that the SWNTs were doped in air. To the best of our knowledge, this is the first time numerous SWNTs were electrically charact...Continue Reading

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Citations

Oct 30, 2012·Nature Nanotechnology·Hongsik ParkWilfried Haensch
Mar 19, 2014·Proceedings of the National Academy of Sciences of the United States of America·Huiliang WangZhenan Bao
Aug 22, 2014·ACS Nano·George S TulevskiWilfried Haensch
Apr 21, 2017·ACS Applied Materials & Interfaces·Xiaoqin YuQingwen Li
Aug 29, 2019·ACS Omega·William J BodnarykAlex Adronov

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