Swelling, intercalation, and exfoliation behavior of layered ruthenate derived from layered potassium ruthenate |
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Authors: | Katsutoshi Fukuda Hisato Kato Jun Sato Wataru Sugimoto Yoshio Takasu |
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Affiliation: | aCollaborative Innovation Center for Nanotech Fiber, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan;bFaculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan |
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Abstract: | The intercalation chemistry of a layered protonic ruthenate, H0.2RuO2.1·nH2O, derived from a layered potassium ruthenate was studied in detail. Three phases with different hydration states were isolated, H0.2RuO2.1·nH2O (n= 0, 0.5, 0.9), and its reactivity with tetrabutylammonium ions (TBA+) was considered. The layered protonic ruthenate mono-hydrate readily reacted with TBA+, affording direct intercalation of bulky tetrabutylammonium ions into the interlayer gallery. Fine-tuning the reaction conditions allowed exfoliation of the layered ruthenate into elementary nanosheets and thereby a simplified one-step exfoliation was achieved. Microscopic observation by atomic force microscopy and transmission electron microscopy clearly showed the formation of unilamellar sheets with very high two-dimensional anisotropy, a thickness of only 1.3±0.1 nm. The nanosheets were characterized by two-dimensional crystallites with the oblique cell of a=0.5610(8) nm, b=0.5121(6) nm and γ=109.4(2)° on the basis of in-plane diffraction analysis. |
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Keywords: | Layered ruthenium oxide Swelling Intercalation Exfoliation Nanosheet |
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