A new approach for the synthesis of layered niobium sulfide and restacking route of NbS{sub 2} nanosheet

Journal Article · Fri Feb 15 04:00:00 EST 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.12.002· OSTI ID:21043894

Izawa, Kazuyoshi ^[1]; Ida, Shintaro ^[1]; Unal, Ugur; Yamaguchi, Tomoki ^[1]; Kang, Joo-Hee; Choy, Jin-Ho ^[2]; Matsumoto, Yasumichi ^[1]

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1. Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto University, Kurokami 2-39-1, Kumamoto 860-8555 (Japan)
2. 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, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ATOMIC FORCE MICROSCOPY
DEPOSITION
EUROPIUM IONS
GAS FLOW
HEATING
ION EXCHANGE
NANOSTRUCTURES
NIOBATES
NIOBIUM SULFIDES
OXIDES
POTASSIUM IONS
SHEETS
SULFURIC ACID
SYNTHESIS
TEMPERATURE RANGE 0400-1000 K