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Synthesis of Monoclinic Potassium Niobate Nanowires That Are Stable at Room Temperature

Authors
Kim, SeungwookLee, Ju-HyuckLee, JaeyeonKim, Sang-WooKim, Myung HwaPark, SungnamChung, HaegeunKim, Yong-IlKim, Woong
Issue Date
9-1월-2013
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.135, no.1, pp.6 - 9
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume
135
Number
1
Start Page
6
End Page
9
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/104216
DOI
10.1021/ja308209m
ISSN
0002-7863
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 similar to 450 degrees 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 SrTiO3 substrates. The monoclinic NWs showed significantly better energy conversion characteristics than orthorhombic NWs. Moreover, the frequency-doubling efficiency of the monoclinic NWs was similar to 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.
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