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Synthesis of monoclinic potassium niobate nanowires that are stable at room temperature

Title
Synthesis of monoclinic potassium niobate nanowires that are stable at room temperature
Authors
Kim S.Lee J.-H.Lee J.Kim S.-W.Kim M.H.Park S.Chung H.Kim Y.-I.Kim W.
Ewha Authors
이재연김명화
SCOPUS Author ID
김명화scopus
Issue Date
2013
Journal Title
Journal of the American Chemical Society
ISSN
0002-7863JCR Link
Citation
vol. 135, no. 1, pp. 6 - 9
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We report the synthesis of KNbO3 nanowires (NWs) with a monoclinic phase, a phase not observed in bulk KNbO3 materials. The monoclinic NWs can be synthesized via a hydrothermal method using metallic Nb as a precursor. The NWs are metastable, and thermal treatment at ∼450 C changed the monoclinic phase into the orthorhombic phase, which is the most stable phase of KNbO3 at room temperature. Furthermore, we fabricated energy-harvesting nanogenerators by vertically aligning the NWs on SrTiO 3 substrates. The monoclinic NWs showed significantly better energy conversion characteristics than orthorhombic NWs. Moreover, the frequency-doubling efficiency of the monoclinic NWs was ∼3 times higher than that of orthorhombic NWs. This work may contribute to the synthesis of materials with new crystalline structures and hence improve the properties of the materials for various applications. © 2012 American Chemical Society.
DOI
10.1021/ja308209m
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자연과학대학 > 화학·나노과학전공 > Journal papers
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