title: Vertically aligned P(VDF-TrFE) core-shell structures on flexible pillar arrays.
abstract: PVDF and P(VDF-TrFE) nano- and micro- structures have been widely used due to their potential applications in several fields, including sensors, actuators, vital sign transducers, and energy harvesters. In this study, we developed vertically aligned P(VDF-TrFE) core-shell structures using high modulus polyurethane acrylate (PUA) pillars as the support structure to maintain the structural integrity. In addition, we were able to improve the piezoelectric effect by 1.85 times from 40 ± 2 to 74 ± 2 pm/V when compared to the thin film counterpart, which contributes to the more efficient current generation under a given stress, by making an effective use of the P(VDF-TrFE) thin top layer as well as the side walls. We attribute the enhancement of piezoelectric effects to the contributions from the shell component and the strain confinement effect, which was supported by our modeling results. We envision that these organic-based P(VDF-TrFE) core-shell structures will be used widely as 3D sensors and power generators because they are optimized for current generations by utilizing all surface areas, including the side walls of core-shell structures.
authors.affiliation: 1] Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea [2] Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
authors.forename: Yoon-Young
authors.initials: YY
authors.lastname: Choi
authors.affiliation: Graduate School of Energy Environment Water Sustainability, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea.
authors.forename: Tae Gwang
authors.initials: TG
authors.lastname: Yun
authors.affiliation: Graduate School of Energy Environment Water Sustainability, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea.
authors.forename: Nadeem
authors.initials: N
authors.lastname: Qaiser
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea.
authors.forename: Haemin
authors.initials: H
authors.lastname: Paik
authors.affiliation: Nuclear Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA.
authors.forename: Hee Seok
authors.initials: HS
authors.lastname: Roh
authors.affiliation: Department of Chemistry, Chung-Ang University, Seoul, 156-756, Korea.
authors.forename: Jongin
authors.initials: J
authors.lastname: Hong
authors.affiliation: 1] Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea [2] Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA.
authors.forename: Seungbum
authors.initials: S
authors.lastname: Hong
authors.affiliation: Graduate School of Energy Environment Water Sustainability, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea.
authors.forename: Seung Min
authors.initials: SM
authors.lastname: Han
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea.
authors.forename: Kwangsoo
authors.initials: K
authors.lastname: No