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首页> 外文期刊>RSC Advances >The effects of additions of two-dimensional graphitic-C3N4 on the negative electro-caloric effects in P(VDF-TrFE) copolymers
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The effects of additions of two-dimensional graphitic-C3N4 on the negative electro-caloric effects in P(VDF-TrFE) copolymers

机译：二维石墨-C3N4的添加对P（VDF-TRFE）共聚物负电热效应的影响

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摘要

In order to enhance and tune the electrocaloric effect (ECE) and ferroelectric responses, nanocomposites containing ferroelectric copolymer poly(vinylidene fluoride trifluoroethylene) and two-dimensional (2D) graphitic-C3N4 (g-C3N4) are synthesized. The effects of g-C3N4 on the ferroelectric-to-paraelectric phase transition of the copolymer are investigated by the differential scanning calorimetry (DSC), P-E hysteresis loop and dielectric spectrum measurements. The results indicate that the addition of 2D g-C3N4 in the ferroelectric copolymer is an effective approach in enhancing its dielectric and ferroelectric properties. Furthermore, the nanocomposites show the maximum absolute value of negative electrocaloric effect (ECE) of 5.4 K at 322 K under an electric field of 0.45 MV cm(-1), which is much better than that of pristine copolymer. The negative ECE of the nanocomposites can be well explained by the Kauzmann theory. The low cost and enhanced negative ferroelectric properties of P(VDF-TrFE) make them more feasible over ceramics materials such as lead zirconate titanate (PZT) based ferroelectrics for applications in electrocaloric refrigeration.
机译：为了增强和调整电热效应（ECE）和铁电反应，合成含有铁电共聚物聚（偏二氟三氟乙烯）和二维（2D）石墨-C3N4（G-C3N4）的纳米复合材料。通过差示扫描量热法（DSC），P-E滞后回路和介电谱测量，研究了G-C3N4对共聚物铁电相转变的影响。结果表明铁电共聚物中的2D G-C3N4在增强其介电和铁电性质方面是一种有效的方法。此外，纳米复合材料显示在0.45mVcm（-1）的电场下为322k的负电热量效应（ECE）的最大绝对值，其比原始共聚物的电场好得多。 Kauzmann理论可以很好地解释纳米复合材料的阴性ECE。 P（VDF-TRFE）的低成本和增强的负铁电性能使得它们更加可行地通过陶瓷材料，例如基于锆钛酸钛酸盐（PZT）的铁电解，用于电热冷的应用。

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  • 来源
    《RSC Advances》 |2019年第28期|共9页
  • 作者

    Ullah Sana; Wang Hao; Liu Bin; Cheng Junye; Shan Guangcun; Zheng Guang-Ping;

  • 作者单位

    Hong Kong Polytech Univ Dept Mech Engn Kowloon Hung Hom Hong Kong Peoples R China;

    Shenzhen Univ Coll Mechatron &

    Control Engn Guangdong Prov Key Lab Micro Nano Optomechatron E Shenzhen 518060 Peoples R China;

    City Univ Hong Kong Dept Mat Sci &

    Engn Ctr Super Diamond &

    Adv Films Hong Kong 999077 Peoples R China;

    City Univ Hong Kong Dept Mat Sci &

    Engn Ctr Super Diamond &

    Adv Films Hong Kong 999077 Peoples R China;

    Beihang Univ Sch Instrument Sci &

    Optoelect Engn 37 XueYuan Rd Beijing 100083 Peoples R China;

    Hong Kong Polytech Univ Dept Mech Engn Kowloon Hung Hom Hong Kong Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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