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Self-poling Mechanism of CNT/PVDF Piezoelectric Composite Films Prepared by Spray Coating Method

스프레이 코팅법으로 제조된 CNT/PVDF 압전 복합막의 자기분극 메커니즘

  • Lee, Sunwoo (Department of Electrical Information, Inha Technical College)
  • 이선우 (인하공업전문대학 전기정보과)
  • Received : 2013.06.11
  • Accepted : 2013.06.24
  • Published : 2013.07.01

Abstract

Carbon nanotubes (CNT) / polyvinylidene fluoride (PVDF) piezoelectric composite films for nanogenerator devices were fabricated by spray coating method. When the CNT/PVDF mixture solution passes through the spray nozzle with small diameter by the compressed nitrogen gas, electric charges are generated in the liquid by a triboelectric effect. Then randomly distributed ${\beta}$ phase PVDF film could be re-oriented by the electric field resulting from the accumulated electrical charges, and might be resulted in extremely one-directionally aligned ${\beta}$ phase PVDF film without additional electric field for poling. X-ray diffraction patterns were used to investigate crystal structure of the CNT/PVDF composite films. It was confirmed that they revealed extremely large portion of the ${\beta}$ phase PVDF crystalline in the film. Therefore we could obtain the poled CNT/PVDF piezoelectric composite films by the spray coating method without additional poling process.

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