A new approach for the synthesis of layered niobium sulfide and restacking route of NbS2 nanosheet

Kazuyoshi Izawa, Shintaro Ida, Ugur Unal, Tomoki Yamaguchi, Joo Hee Kang, Jin Ho Choy, Yasumichi Matsumoto

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23 Citations (Scopus)


We have developed a new process for the synthesis of a layered niobium sulfide that involves heating K4Nb6O17·3H2O with a H2S/N2 gas mixture. It was confirmed that heating the starting layered oxide at 750 °C for 10 h under the gas flow yielded a highly crystalline, single-phase K0.34(H2O)0.7NbS2. The layered sulfide slabs had a large plate-like shape. Potassium ions in the interlayer of K0.34(H2O)0.7NbS2 could be exchanged with protons by stirring in 2 M H2SO4. It was found that the proton in the proton-exchanged form can be easily exchanged with other cations. The proton-exchanged form was exfoliated into NbS2 nanosheets by ultrasonication in water. According to the atomic force microscopy (AFM) images, NbS2 nanosheets had a thickness of around 4 Å, which roughly corresponded to the thickness of a single NbS2 host layer. NbS2 nanosheets could be restacked with the intercalation of Eu3+ or tetrabutylammonium ions by an electrostatic self-assembly deposition (ESD) technique.

Original languageEnglish
Pages (from-to)319-324
Number of pages6
JournalJournal of Solid State Chemistry
Issue number2
Publication statusPublished - Feb 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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