Ionic peapods from carbon nanotubes and phosphotungstic acid

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)


Using a mild wet-chemical route, cage-like phosphotungstic acid (HPW) molecules of 1.2 nm diameter were successfully filled into opened carbon nanotubes (CNTs) with cavity diameter of 2 nm. High resolution transmission electron microscope revealed that HPW molecules arrayed in a chain in the tube cavity, forming a new kind of peapod structure. In aqueous solution these unusual peapods showed higher ionic property than the opened nanotubes, with a ζ-potential of -47.5 ± 1.3 mV, and dissolved finely as a stable solution. Raman spectra confirmed the strong interaction between HPW molecules and CNT graphite wall. It could substantially tune the electronic properties of CNTs and thus promote their applications in novel electronic devices.
Original languageEnglish
Pages (from-to)2261-2264
Number of pages4
Issue number11
Publication statusPublished - 1 Sept 2006


  • Carbon nanotubes
  • Doping
  • Raman spectroscopy
  • Stabilization
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Chemistry(all)


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