Synthesis of Thin Film by Self-Assembly of Perovskite Nanosheets

Abstract:

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Layered perovskite, K2NbO3F, includes rock-salt type KF blocks in a K2NiF4 type structure. After the KF blocks are dissolved selectively in water at room temperature, the resultant colloidal suspension consists of nanosheet forms. Positively charged K+ ions in colloidal suspension act as an inorganic binder in electrostatic self-assembly with an exfoliated perovskite nanosheet. In the present study, we synthesized a KNbO3 thin film on a quartz substrate using a self-assembly process. The thin film on a quartz substrate was characterized using XRD analysis. The molar extinction coefficient of the colloidal suspension and absorbance of the thin film were examined using UV-vis absorption spectra. Respective thicknesses of perovskite nanosheet aggregate thin films were examined using AFM. The UV-vis absorption spectra of the films showed an increase in absorbance with increasing immersion time, suggesting growth of a self-assembled multilayer comprising perovskite nanosheets and K+ ions.

Info:

Periodical:

Edited by:

Masaru Miyayama, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki

Pages:

99-104

DOI:

10.4028/www.scientific.net/KEM.301.99

Citation:

A. Sugawara et al., "Synthesis of Thin Film by Self-Assembly of Perovskite Nanosheets", Key Engineering Materials, Vol. 301, pp. 99-104, 2006

Online since:

January 2006

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Price:

$35.00

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