Tunable Thermal Conductivity of Ferroelectric P(VDF-TrFE) Nanofibers via Molecular Bond Modulation
Lan Dong1,2 , Bohai Liu3 , Yuanyuan Wang1,2* , and Xiangfan Xu3*
1 School of Energy and Materials, Shanghai Polytechnic University, Shanghai 201209, China2 Shanghai Engineering Research Center of Advanced Thermal Functional Materials, Shanghai Polytechnic University, Shanghai 201209, China3 Center for Phononics and Thermal Energy Science, China-EU Joint Center for Nanophononics, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
Abstract ：Dipoles in ferroelectric copolymer P(VDF-TrFE) can be driven by electric field, introducing phonon transport modulations via 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.
收稿日期: 2022-09-27
出版日期: 2022-12-04
:
65.60.+a
(Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.)
44.10.+i
(Heat conduction)
66.30.hk
(Polymers)
74.25.Kc
(Phonons)
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2022, Vol. 39 
