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Facile exfoliation of layered titanoniobate (KTiNbO 5) into colloidal nanosheets

Title
Facile exfoliation of layered titanoniobate (KTiNbO 5) into colloidal nanosheets
Authors
Park I.Han Y.-S.Choy J.-H.
Ewha Authors
최진호
SCOPUS Author ID
최진호scopus
Issue Date
2009
Journal Title
Journal of Nanoscience and Nanotechnology
ISSN
1533-4880JCR Link
Citation
vol. 9, no. 12, pp. 7190 - 7194
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We herein describe a soft-chemical route to exfoliation of layered semiconductive titanoniobate (KTiNbO 5) into individual oxide nanosheets. The protonic layered titanoniobate (HTiNbO 5), derived from KTiNbO 5, is reacted with zwitterionic aminoundecanoic acid (H 2N(CH 2) 10COOH; AUA) to replace the interlayer H + ions with AUA molecules in an acidic aqueous solution (pH ∼3). On intercalating amino acid molecules into titanoniobate layers, the basal spacing expands from 8.5 A° to 23.7 A°. Further expansion of the layers is achieved by a host-guest repulsive interaction via the interlayer deprotonation of the carboxylic groups of amino acid molecules in a basic aqueous solution. The exfoliated oxide nanosheets exhibit remarkable colloidal stability in aqueous solution with a significant spectral blue shift in UV optical absorption spectra. Moreover, atomic force microscopic (AFM) and scanning electron microscopic (SEM) observations directly confirm the deiamination of parent microcrystals. © 2009 American Scientific Publishers. All rights reserved.
DOI
10.1166/jnn.2009.1604
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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