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Sci Rep. 2018 Mar 19;8(1):4851. doi: 10.1038/s41598-018-23172-1.

Highly Dispersible Buckled Nanospring Carbon Nanotubes for Polymer Nano Composites.

Author information

1
Center for Opto-Electronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Hwarangro 14 gil 5, Sungbuk Gu, Seoul, 02792, Korea.
2
Department of Electronic, Electrical, and Computer Engineering, College of Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Korea.
3
Division of Nano & Information Technology, KIST School, Korea University of Science and Technology (KUST), Seoul, 02792, Republic of Korea.
4
Department of Polymer Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju-si, Chungbuk, 27469, Korea.
5
Department of Physics, Bangalore University, Bangalore, 560 056, India.
6
Korea Institute of Ceramic Engineering and Technology, 101, Soho-ro, Jinju-si, Gyeongsangnam-do, 52851, Korea.
7
Department of Electronic, Electrical, and Computer Engineering, College of Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Korea. bkju@korea.ac.kr.
8
Center for Opto-Electronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Hwarangro 14 gil 5, Sungbuk Gu, Seoul, 02792, Korea. wkchoi@kist.re.kr.
9
Division of Nano & Information Technology, KIST School, Korea University of Science and Technology (KUST), Seoul, 02792, Republic of Korea. wkchoi@kist.re.kr.

Abstract

We propose the unique structure of highly dispersible single-walled carbon nanotubes (SWCNTs) in various solvents and polymers using the ZnO nano particle template. Buckled nanospring-shaped carbon nanotubes (NS-CNTs) were synthesized by a chemical reaction of ZnO nanoparticles with acid-treated SWCNTs and then dissolving ZnO through chemical etching. The unique structure of distorted hexagonal NS-CNTs encircled around ZnO nanoparticles was formed by the bending of SWCNTs caused by the agglomeration of chemically adsorbed Zn(OH)2, which is further crystallized as the polycrystalline ZnO inner core. The highly dispersible NS-CNTs could be incorporated in the poly[(vinylidenefluoride-co-trifluoroethylene] [P(VDF-TrFE)] copolymer, one of widely studied ferro- and piezo-electric polymer, up to the value of 15 wt% as nanofillers. The relative dielectric constant (K) of polymer nanocomposite, at 1 kHz, was greatly enhanced from 12.7 to the value of 62.5 at 11 wt% of NS-CNTs, corresponding to a 492% increase compared to that of pristine P(VDF-TrFE) with only a small dielectric loss tangent (D) of 0.1.

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