Variation in chemical, colloidal and electrochemical properties of carbon nanotubes with the degree of carboxylation

Zheqiong Wu, Zhiqian Wang, Fang Yu, Megha Thakkar, Somenath Mitra

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10 Scopus citations

Abstract

Multiwalled carbon nanotubes (CNTs) were carboxylated via microwave irradiation where the treatment time was varied to alter the degree of functionalization, and as many as one in 15 carbons in the CNT could be oxidized. Chemical, physical, electrochemical, and colloidal behavior of the carboxylated CNTs was studied. All properties changed with the degree of functionalization to a point beyond which they appeared to remain constant. The surface area increased from 173.9 to 270.9 m2/g while the critical coagulation concentration (CCC) values increased from 142.14 to 168.69 mM in the presence of NaCl, and the corresponding increase was from 0.97 to 5.32 mM in the presence of MgCl2. As seen from cyclic voltammetry curves, the functionalized CNTs showed mainly non-Faradic interactions with Na2SO4, but showed Faradic behaviors in alkaline KOH.

Original languageEnglish (US)
Article number16
JournalJournal of Nanoparticle Research
Volume19
Issue number1
DOIs
StatePublished - Jan 1 2017

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • Carbon nanotubes
  • Colloidal stability
  • Degree of functionalization
  • Electrochemical property

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