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Lead-free KNbO 3 ferroelectric nanorod based flexible nanogenerators and capacitors

Title
Lead-free KNbO 3 ferroelectric nanorod based flexible nanogenerators and capacitors
Authors
Jung J.H.Chen C.-Y.Yun B.K.Lee N.Zhou Y.Jo W.Chou L.-J.Wang Z.L.
Ewha Authors
조윌렴
SCOPUS Author ID
조윌렴scopus
Issue Date
2012
Journal Title
Nanotechnology
ISSN
0957-4484JCR Link
Citation
vol. 23, no. 37
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
In spite of high piezoelectricity, only a few one-dimensional ferroelectric nano-materials with perovskite structure have been used for piezoelectric nanogenerator applications. In this paper, we report high output electrical signals, i.e.an open-circuit voltage of 3.2V and a closed-circuit current of 67.5nA (current density 9.3nAcm 2) at 0.38% strain and 15.2%s 1 strain rate, using randomly aligned lead-free KNbO 3 ferroelectric nanorods (∼1μm length) with piezoelectric coefficient (d 33∼55pmV 1). A flexible piezoelectric nanogenerator is mainly composed of KNbO 3-poly(dimethylsiloxane) (PDMS) composite sandwiched by Au/Cr-coated polymer substrates. We deposit a thin poly(methyl methacrylate) (PMMA) layer between the KNbO 3-PDMS composite and the Au/Cr electrode to completely prevent dielectric breakdown during electrical poling and to significantly reduce leakage current during excessive straining. The flexible KNbO 3-PDMS composite device shows a nearly frequency-independent dielectric constant (∼3.2) and low dielectric loss (<0.006) for the frequency range of 10 2-10 5Hz. These results imply that short and randomly aligned ferroelectric nanorods can be used for a flexible high output nanogenerator as well as high-k capacitor applications by performing electrical poling and further optimizing the device structure. © 2012 IOP Publishing Ltd.
DOI
10.1088/0957-4484/23/37/375401
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자연과학대학 > 물리학전공 > Journal papers
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