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Room-Temperature Dielectric Switchable Nanocomposites

机译：室温介电可切换纳米复合材料

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摘要

Room-temperature switchable dielectric materials are of interest for many applications, including solar energy storage, smart switches, automatic filters, and next-generation sensors. Here, a temperature-triggered dielectric switchable nanocomposite by dispersing octadecylamine-grafted multiwalled carbon nanotubes (ODA-MWCNTs, for short) into hexadecane is reported. The composite has low permittivity at molten state and high permittivity at frozen state, and the permittivity switch is triggered around 18 degrees C. The highest permittivity contrast ratio reaches 106.4 at 2.0% CNT volume fraction. The composite shows frequency-sensitive and temperature-ramping-rate-sensitive properties. Further investigation indicates that the permittivity switch is caused by the change of the ODA-MWCNT percolating networks during phase transition.
机译：室温可切换介电材料在许多应用中都受到关注，包括太阳能存储，智能开关，自动滤波器和下一代传感器。在此，报道了通过将十八烷基胺接枝的多壁碳纳米管（简称ODA-MWCNT）分散到十六烷中来触发温度的介电可切换纳米复合材料。该复合物在熔融状态下的介电常数低，在冷冻状态下的介电常数高，并且在18℃左右触发介电常数转换。在2.0％的CNT体积分数下，最高的介电常数对比度达到106.4。该复合材料显示出频率敏感和温度上升速率敏感的特性。进一步的研究表明，介电常数的变化是由相变过程中ODA-MWCNT渗滤网络的变化引起的。

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  • 来源
    《Advanced Functional Materials》 |2017年第30期|1701136.1-1701136.8|共8页
  • 作者

    Meng Peng; Zhang Quan; Wu Yulong; Tan Zhiyuan; Cheng Guoan; Wu Xiaoling; Zheng Ruiting;

  • 作者单位

    Beijing Normal Univ, Coll Nucl Sci & Technol, Key Lab Radiat Beam Technol & Mat Modificat, Minist Educ, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Coll Nucl Sci & Technol, Key Lab Radiat Beam Technol & Mat Modificat, Minist Educ, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Coll Nucl Sci & Technol, Key Lab Radiat Beam Technol & Mat Modificat, Minist Educ, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Coll Nucl Sci & Technol, Key Lab Radiat Beam Technol & Mat Modificat, Minist Educ, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Coll Nucl Sci & Technol, Key Lab Radiat Beam Technol & Mat Modificat, Minist Educ, Beijing 100875, Peoples R China|Beijing Radiat Ctr, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Coll Nucl Sci & Technol, Key Lab Radiat Beam Technol & Mat Modificat, Minist Educ, Beijing 100875, Peoples R China|Beijing Radiat Ctr, Beijing 100875, Peoples R China;

    Beijing Normal Univ, Coll Nucl Sci & Technol, Key Lab Radiat Beam Technol & Mat Modificat, Minist Educ, Beijing 100875, Peoples R China|Beijing Radiat Ctr, Beijing 100875, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    carbon nanotubes; composites; dielectric switches; room temperature materials; phase changes;

    机译：碳纳米管;复合材料;介电开关;室温材料;相变;

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