Fabrication of highly crystalline NbO x nanotube/cup-stacked CNT nanocomposites

Sayaka Suzuki, Katsuya Teshima, Sun Hyung Lee, Kunio Yubuta, Takahiro Ishizaki, Toetsu Shishido, Shuji Oishi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Carbon nanotubes (CNTs) are promising catalyst supports for fuel cell applications. Metal oxide/CNT nanocomposites are also being studied for dye-sensitized solar-cell, photocatalyst, and sensor applications. The fabrication of nanocomposites consisting of highly crystalline NbO x nanotubes and cup-stacked carbon nanotubes (CSCNTs) is reported herein. The CSCNTs were selected for the carbon materials because of their distinctive structure. The CSCNTs were photochemically treated with vacuum ultraviolet light, which increased the amount of oxygen-containing functional groups therein. NbO x nanotubes with no defects were successfully prepared with the chemical treatment of highly crystalline, layered, flux-grown K 4Nb 6O 17 crystals. First, K 4Nb 6O 17 crystals were grown from a KCl flux at a holding temperature of 800 °C. Next, NbO x nanosheets were prepared from the layered K 4Nb 6O 17 crystals via a two-step exfoliation process, which consists of proton exchange in an acid solution and intercalation of the tetrabutylammonium ions. The NbO x nanosheets were rolled up into nanotubes with diameters of about 20 nm and lengths of 100-500 nm on the surfaces of the CSCNTs; thus, unique and complex NbO x/CSCNT nanocomposites were successfully fabricated.

Original languageEnglish
Pages (from-to)6335-6340
Number of pages6
JournalJournal of nanoscience and nanotechnology
Issue number7
Publication statusPublished - Jul 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics


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