Dielectrophoretic assembly of semiconducting carbon nanotubes separated and enriched by spin column chromatography and its application to gas sensing

Michihiko Nakano, Masahiro Fujioka, Kaori Mai, Hideaki Watanabe, Yul Martin, Junya Suehiro

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The present authors have previously demonstrated the electrokinetic fabrication of a single-walled carbon nanotube (SWCNT) gas sensor by employing dielectrophoresis. Because this method employs mass-produced SWCNTs, it can realize cheaper and more flexible SWCNT gas sensor fabrication than that based on the on-site synthesis of SWCNTs. In this study, a new protocol was proposed and tested for the separation and enrichment of semiconducting SWCNTs, aiming to improve the SWCNT gas sensor sensitivity. The protocol employed a spin column filled with size-exclusion dextran-based gel beads as well as two surfactants (sodium dodecyl sulfate and sodium deoxycholate), which had different affinities to metallic and semiconducting SWCNTs. The separation and enrichment of the semiconducting SWCNTs were confirmed by measuring their optical and electrical properties. The CNT gas sensor fabricated using enriched semiconducting SWCNTs was highly sensitive to nitrogen dioxide (NO 2) gas,-more sensitive by 10 times than that fabricated using the pristine SWCNT mixture.

Original languageEnglish
Article number045102
JournalJapanese journal of applied physics
Volume51
Issue number4 PART 1
DOIs
Publication statusPublished - Apr 2012

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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