Conductive polymers (CPs) are arranged in the end-on direction on graphene surfaces using 3D tectons of ZnPc assemblies, to control carrier transport from hot to cold via external magnetic fields. Poly(3,4-ethylenedioxythiophene)s doped with tosylate are synthesized using monomer seeds that are complexed through pyridine units to 3D tectons on graphene via surface-confined host-guest chemistry, to provide an end-on-oriented polymer film on graphene with a high degree of crystallinity. The film shows free-electron-like charge transport properties, with an enhanced Hall mobility, and an increased Seebeck coefficient compared to the CP on graphene that is prepared without 3D tectons. A magneto-thermoelectric (MTE) effect is reproducibly observed for the film device. Taking advantage of a large photothermal effect of the polymer film, a photon-mode MTE effect is demonstrated for the first time. Both dark and photo-MTE effects correlate well to the generated Lorentz force. These results provide a unique tool to program carrier transport in thin-film via external magnetic stimuli with a temperature gradient.
|Journal||Advanced Functional Materials|
|Publication status||Published - 2021 Nov 3|
Bibliographical noteFunding Information:
This research was supported by a National Research Foundation (NRF) grant funded by the Korean government (Ministry of Science, ICT & Future Planning, MSIP) through the Global Research Lab (GRL: 2016K1A1A2912753), Creative Materials Discovery Program (2018M3D1A1058536), Basic Science Research Program (2020R1I1A1A01057070), and BK21 plus program in 2020 (2018H1D3A2001751). This research was supported by AOARD, Air Force Office of Scientific Research (AFOSR) under the Grant number FA9550‐19‐S‐0003. The authors thank Dr. Younghun Cho (Korea Basic Science Institute, Daejeon Center) for helpful discussions regarding PPMS data analysis.
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics