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학술지 High Performance Flexible Piezoelectric Pressure Sensor Based on CNTs-Doped 0-3 Ceramic-Epoxy Nanocomposites
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저자
김혜진, 김윤정
발행일
201808
출처
Materials & Design, v.151, pp.133-140
ISSN
0264-1275
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.matdes.2018.04.048
협약과제
18HB1700, 휴먼 감각 감지 및 진단을 위한 초감각 스마트 물리센서 원천 기술, 김혜진
초록
The high-content ceramic-epoxy nanocomposites for highly sensitive piezoelectric pressure sensor were fabricated using Pb(Zr1/2Ti1/2)O3-(Pb(Zn1/3Nb2/3)O3-Pb(Ni1/3Nb2/3)O3) and epoxy resin with the contents of 81 and 19 wt% respectively. This paper represents the effects of multi-wall carbon nanotubes (MWCNTs) conductive filler on the electrical conductivity, dielectric and piezoelectric properties of the ceramic-epoxy nanocomposite films. Based on the percolation theory, it was revealed that small amounts of CNTs dispersed within the nanocomposite film can significantly improve the dielectric and piezoelectric properties of the film due to their features acting as conductive bridges between the piezoelectric ceramic particles. The fabricated flexible ceramic-epoxy nanocomposite film with 0.07 wt% CNTs had highest piezoelectric coefficients of 68 pC/N (d33) and 434 mV쨌m/N (g33), which are respectively 2.5 and 2.2 times higher than those of the preliminary nanocomposite film. Corresponding to the enhanced dielectric and piezoelectric properties of CNTs-doped nanocomposite films, it was also shown that the fabricated flexible piezoelectric pressure sensor can generate highly sensitive performance with the increase of CNTs below the percolation threshold. The flexible piezoelectric nanocomposite pressure sensor optimized with 0.07 wt% CNTs filler content provided the remarkably enhanced output voltage of 575.42 mV under 1 N.
키워드
Carbon nanotube, Conductivity, Dielectric, Nanocomposite, Piezoelectric, Pressure sensor, Sensitivity
KSP 제안 키워드
Carbon nano-tube(CNT), Ceramic particle, Conductive bridges, Dielectric and piezoelectric properties, Electrical conductivity(EC), Epoxy nanocomposite, Epoxy resin, Filler content, High performance, High-content, Highly sensitive