Giant negative electrocaloric effect measured by indirect method in X-ray irradiated P(VDF-TrFE)films  

作　　者：Bo Li Bin Yang Hong Zhang Jiajia Zhang Qianjin Wang Weishu Liu 

机构地区：[1]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong 518055,China [2]Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,Southern University of Science and Technology,Shenzhen,China [3]College of Physics and Electronic Information,Yunnan Normal University,Yunnan Kunming 650500,China [4]The Science and Technology on Reliability Physics and Application of Electronic Component Laboratory,China Electronic Product Reliability and Environmental Testing Research Institute,Guangzhou 510610,China

出　　处：《Journal of Materiomics》2024年第3期624-631,共8页无机材料学学报（英文）

基　　金：supported by Guangdong Basic and Applied Basic Research Foundation(2023A1515012638);Shenzhen Natural Science Funds for Distinguished Young Scholar(No.RCJC20210706091949018);Guangdong Provincial Key Laboratory Program(No.2021B1212040001)of the Department of Science and Technology of Guangdong Province;the National Natural Science Foundation of China(Nos.11864046);the Basic Research Program of Yunnan Province(Nos.202001AT070064)。

摘　　要：Flexible solid-state cooling devices with high efficiency are attracted to ferroelectric polymers with excellent negative electrocaloric(EC)effects.It is challenging to obtain a large negative EC effect in ferroelectric polymers due to the lack of tunable techniques.A giant negative EC response was obtained in the poly(vinylidene fluoride-trifluoroethylene)copolymers(P(VDF-TrFE),70/30,in mole ratio)irra-diated with high-energy X-ray.The irradiated P(VDF-TrFE)films showed an adiabatic temperature change of-13.5 K at 40 MV/m under a dose of 5 Mrad(1 Mrad=10^(4) J/kg)obtained by the indirect method.This significant negative EC effect is attributed to the enhancement of crystalline due to the entry of polymer molecules into the amorphous to crystalline structure and the reduction of heat ca-pacity due to the increase of crosslinking.In addition,X-ray irradiation improves the dielectric coefficient from 15 to 22.This research indicates that irradiation can modify the negative EC properties of ferro-electric polymers for solid-state cooling.

关 键 词：Negative electrocaloric effects X-rays radiation P(VDF-TrFE)films 

分 类 号：O63[理学—高分子化学]