Structural and Piezoelectric Properties of (Na1−xKx)NbO3 Platelets and Their Application for Piezoelectric Nanogenerator |
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| Authors: | HaiBo Xu Young‐Jin Ko Tae‐Gon Lee Su‐Jin Park Myoung‐Sub Noh Bo‐Yun Kim Jeong Seog Kim Sahn Nahm |
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| Affiliation: | 1. Department of Materials Science and Engineering, Korea University, Seongbuk‐Gu, Seoul, Korea;2. Information Technology‐Nano Science, KU‐KIST Graduate School of Converging Science and Technology, Seongbuk‐Gu, Seoul, Korea;3. Department of Digital Display Engineering, Hoseo University, Cheon An‐si, Chung cheongnam‐do, Korea |
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| Abstract: | (Na1?xKx)NbO3 (NKN) platelets synthesized at 600°C for 12 h have an Amm2 orthorhombic structure. However, the structure of NKN platelets synthesized at 500°C is a mixture of R3m rhombohedral and Amm2 orthorhombic structures. The formation of a rhombohedral structure is attributed to the presence of OH? and H2O defects in the NKN platelets. The piezoelectric strain constant (d33) of NKN platelets synthesized at 600°C for 12 h is 100 pmV?1, whereas that of NKN platelets synthesized at 500°C is lesser (50 pmV?1) due to the presence of these defects. Piezoelectric nanogenerators (PNGs) are fabricated using composites consisting of NKN platelets and polydimethylsiloxane. A large output voltage of 25 V and output current of 2.7 μA were obtained for the PNG with NKN platelets synthesized at 600°C for 6 h. This PNG shows a high output electrical energy of 3.0 μW at an external load of 5.1 MΩ. |
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| Keywords: | NKN platelet lead‐free piezoelectric materials piezoelectric nanogenerators |
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