Separation and enrichment of semiconducting carbon nanotubes and its application to highly sensitive carbon nanotube gas sensor

M. Fujioka, H. Watanabe, Y. Martin, M. Nakano, J. Suehiro

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We have previously demonstrated a fabrication method of single-walled carbon nanotubes (SWCNTs) based gas sensor by employing dielectrophoresis. Because this method uses the SWCNTs that are synthesized in bulk, it is a cheaper and more flexible method than that of on-site synthesized. This method can quantify the amount of trapped nanotubes on a real time basis by monitoring the electrical impedance of the sensor simultaneously with its fabrication. In this study, semiconducting SWCNTs, which served as transducer in gas detection, were separated from commercially available mixture of semiconducting and metallic ones, and were further enriched by using a spin column and dextran-based gel. The separation and enrichment of the semiconducting SWCNTs were confirmed by measuring their optical and electrical properties. The CNT gas sensor fabricated using separated semiconducting SWCNTs was highly sensitive against nitrogen dioxide gas, - more sensitive by two times than that fabricated using the pristine SWCNTs mixture.

Original languageEnglish
Title of host publication2011 IEEE Nanotechnology Materials and Devices Conference, NMDC 2011
Pages403-407
Number of pages5
DOIs
Publication statusPublished - Dec 1 2011
Event2011 IEEE Nanotechnology Materials and Devices Conference, NMDC 2011 - Jeju, Korea, Republic of
Duration: Oct 18 2011Oct 21 2011

Publication series

Name2011 IEEE Nanotechnology Materials and Devices Conference, NMDC 2011

Other

Other2011 IEEE Nanotechnology Materials and Devices Conference, NMDC 2011
CountryKorea, Republic of
CityJeju
Period10/18/1110/21/11

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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