A new approach for the synthesis of layered niobium sulfide and restacking route of NbS{sub 2} nanosheet
- Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto University, Kurokami 2-39-1, Kumamoto 860-8555 (Japan)
- Center for Intelligent Nano-Bio Materials (CINBM), Division of Nanoscience and Department of Chemistry, Ewha Womans University, Seoul 120-750 (Korea, Republic of)
We have developed a new process for the synthesis of a layered niobium sulfide that involves heating K{sub 4}Nb{sub 6}O{sub 17}.3H{sub 2}O with a H{sub 2}S/N{sub 2} gas mixture. It was confirmed that heating the starting layered oxide at 750 deg. C for 10 h under the gas flow yielded a highly crystalline, single-phase K{sub 0.34}(H{sub 2}O){sub 0.7}NbS{sub 2}. The layered sulfide slabs had a large plate-like shape. Potassium ions in the interlayer of K{sub 0.34}(H{sub 2}O){sub 0.7}NbS{sub 2} could be exchanged with protons by stirring in 2 M H{sub 2}SO{sub 4}. 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 NbS{sub 2} nanosheets by ultrasonication in water. According to the atomic force microscopy (AFM) images, NbS{sub 2} nanosheets had a thickness of around 4 A, which roughly corresponded to the thickness of a single NbS{sub 2} host layer. NbS{sub 2} nanosheets could be restacked with the intercalation of Eu{sup 3+} or tetrabutylammonium ions by an electrostatic self-assembly deposition (ESD) technique. - Graphical abstract: Potassium-intercalated layered niobium sulfide has been synthesized by heating a corresponding layered niobate in a H{sub 2}S/N{sub 2} mixture gas. Proton-exchanged layered niobium sulfide has been exfoliated into NbS{sub 2} mono-nanosheet. The NbS{sub 2} mono-nanosheet was restacked with cationic species by an electrostatic self-assembly deposition.
- OSTI ID:
- 21043894
- Journal Information:
- Journal of Solid State Chemistry, Vol. 181, Issue 2; Other Information: DOI: 10.1016/j.jssc.2007.12.002; PII: S0022-4596(07)00515-4; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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