Volume 1 Issue 1
March  2021
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Xiaoling Zang, Yuqian Jiang, Yuqiao Chai, Fengwang Li, Junhui Ji, Mianqi Xue. Tunable metallic-like transport in polypyrrole[J]. Materials Futures, 2022, 1(1): 011001. doi: 10.1088/2752-5724/ac44ab
Citation: Xiaoling Zang, Yuqian Jiang, Yuqiao Chai, Fengwang Li, Junhui Ji, Mianqi Xue. Tunable metallic-like transport in polypyrrole[J]. Materials Futures, 2022, 1(1): 011001. doi: 10.1088/2752-5724/ac44ab
Letter •

Tunable metallic-like transport in polypyrrole

© 2022 The Author(s). Published by IOP Publishing Ltd on behalf of the Songshan Lake Materials Laboratory
Materials Futures, Volume 1, Number 1
  • Received Date: 2021-11-02
  • Accepted Date: 2021-12-10
  • Available Online: 2023-01-06
  • Publish Date: 2022-02-16
  • Conjugated polymers (CPs), organic macromolecules with a linear backbone of alternating C–C and C=C bonds, possess unique semiconductive properties, providing new opportunities for organic electronics, photonics, information, and energy devices. Seeking the metallic or metallic-like, even superconducting properties beyond semiconductivity in CPs is always one of the ultimate goals in polymer science and condensed matter. Only two metallic and semi-metallic transport cases—aniline-derived polyaniline and thiophene-derived poly(3,4-ethylenedioxythiophene)—have been reported since the development of CPs for four decades. Controllable synthesis is a key challenge in discovering more cases. Here we report the metallic-like transport behavior of another CP, polypyrrole (PPy). We observe that the transport behavior of PPy changes from semiconductor to insulator-metal transition, and gradually realizes metallic-like performance when the crystalline degree increases. Using a generalized Einstein relation model, we rationalized the mechanism behind the observation. The metallic-like transport in PPy demonstrates electron strong correlation and phonon–electron interaction in soft condensation matter, and may find practical applications of CPs in electrics and spintronics.

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