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arXiv · 2212.02840

Tunable thermal conductivity of ferroelectric P(VDF-TrFE) nanofibers via molecular bond modulation

Lan Dong·Bohai Liu·Yuanyuan Wang·Xiangfan Xu
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Abstract

The dipoles in ferroelectric copolymer P(VDF-TrFE) can be driven by electric field, introducing phonon transport modulations through polarizing molecular chains. The thermal conductivity in single 75/25 P(VDF-TrFE) nanofibers is found to increase with electric field related phonon renormalization, resulted from change in vibrational assignment excited by polarization process. This is evidenced by a direct change of bond energy and bond length in 75/25 P(VDF-TrFE) nanofibers from Raman characterization under polarization electric field. The experimental results provide further intuitive evidences that the size of ferroelectric polymers could directly affect the ferroelectricity from the size-dependent thermal transport measurement.

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Lan Dong, Bohai Liu, Yuanyuan Wang, Xiangfan Xu. 2022-12-06. Tunable thermal conductivity of ferroelectric P(VDF-TrFE) nanofibers via molecular bond modulation. https://doi.org/10.1088/0256-307x%2F39%2F12%2F127201

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