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형성재 ( Sung Jae Hyoung ),강은서 ( Eun Seo Kang ),강유빈 ( Yubin Kang ),김채령 ( Chae Ryeong Kim ),안창원 ( Chang Won Ahn ),김병우 ( Byeong Woo Kim ),이재신 ( Jae-shin Lee ),한형수 ( Hyoung-su Han ) 한국전기전자재료학회 2024 전기전자재료학회논문지 Vol.37 No.4
Piezoelectric ceramics play an important role in various electronic applications. However, traditional ceramics are difficult to be used in some complicated structures, due to their low flexibility and high brittleness. To solve this problem, this study prepared and investigated ceramic/polymer composites that can utilize a good flexibility of polymers. Polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) and 0.77(Bi<sub>1/2</sub>Na<sub>1/2</sub>)TiO<sub>3</sub>-0.23SrTiO<sub>3</sub> (BNST23) ceramics were selected to fabricate the composites. Ceramic/polymer composites were prepared using various volume fractions of BNST23 ceramics. The distribution of piezoceramic particles in BNST23/PVDF-TrFE composites was investigated using optical microscopy (OM) and scanning electron microscopy (SEM). The dielectric and piezoelectric properties of the composites were significantly influenced by the volume fraction of the piezoelectric ceramics. As a result, the highest piezoelectric constant (d33) of 56 pC/N was obtained in a composites with 70% volume fraction of BNST23 ceramics. Accordingly, it is expected that BNST23/PVDF-TrFE composites can be applied to various sensor applications.