Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting

Jing Wang, Tuan Dat Nguyen, Qing Cao, Yilei Wang, Marcus Y.C. Tan, Mary B. Chan-Park

Research output: Contribution to journalArticle

Abstract

Semiconducting (semi-) single-walled carbon nanotubes (SWNTs) must be purified of their metallic (met-) counterparts for most applications including nanoelectronics, solar cells, chemical sensors, and artificial skins. Previous bulk sorting techniques are based on subtle contrasts between properties of different nanotube/dispersing agent complexes. We report here a method which directly exploits the nanotube band structure differences. For the heterogeneous redox reaction of SWNTs with oxygen/water couple, the aqueous pH can be tuned so that the redox kinetics is determined by the availability of nanotube electrons only at/near the Fermi level, as predicted quantitatively by the Marcus-Gerischer (MG) theory. Consequently, met-SWNTs oxidize much faster than semi-SWNTs and only met-SWNTs selectively reverse the sign of their measured surface zeta potential from negative to positive at the optimized acidic pH when suspended with nonionic surfactants. By passing the redox-reacted nanotubes through anionic hydrogel beads, we isolate semi-SWNTs to record high electrically verified purity above 99.94% ± 0.04%. This facile charge sign reversal (CSR)-based sorting technique is robust and can sort SWNTs with a broad diameter range.

Original languageEnglish (US)
Pages (from-to)3222-3232
Number of pages11
JournalACS Nano
Volume10
Issue number3
DOIs
StatePublished - Mar 22 2016
Externally publishedYes

Fingerprint

selective surfaces
Carbon Nanotubes
Single-walled carbon nanotubes (SWCN)
Surface charge
classifying
Sorting
Nanotubes
Carbon nanotubes
nanotubes
purity
carbon nanotubes
Artificial Skin
Nanoelectronics
Redox reactions
Hydrogel
dispersing
Nonionic surfactants
Zeta potential
Fermi level
Chemical sensors

Keywords

  • carbon nanotubes
  • charge sign reversal
  • gel chromatography
  • purification
  • sorting

ASJC Scopus subject areas

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

Cite this

Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting. / Wang, Jing; Nguyen, Tuan Dat; Cao, Qing; Wang, Yilei; Tan, Marcus Y.C.; Chan-Park, Mary B.

In: ACS Nano, Vol. 10, No. 3, 22.03.2016, p. 3222-3232.

Research output: Contribution to journalArticle

Wang, Jing ; Nguyen, Tuan Dat ; Cao, Qing ; Wang, Yilei ; Tan, Marcus Y.C. ; Chan-Park, Mary B. / Selective Surface Charge Sign Reversal on Metallic Carbon Nanotubes for Facile Ultrahigh Purity Nanotube Sorting. In: ACS Nano. 2016 ; Vol. 10, No. 3. pp. 3222-3232.
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