Abstract

Thermo-responsive materials can be used in temperature sensing systems. In this study, we demonstrated a carbon nanotube (CNT) incorporated form-stable phase change material (FSPCM) that exhibits variation of electrical resistivity in over three orders of magnitude during phase transition. The electrical resistivity was manipulated by the volume change induced by the thermal energy due to the phase transformation. The phase change material (PCM) was encapsulated by polyaniline (PANI) and the solid state of the microcapsule was maintained during the melting and cooling processes. The form-stable microcapsules underwent volume expansion and shrinkage with respect to the temperature. Thus, the thermal expansion coefficient is related to the temperature variation and volume change of PCM capsules. The CNT embedded phase change material (PCM) showed remarkable electrical reversibility and thermal stability in the melting/cooling cycles. We expect that the CNT/PCM nanocomposite can be successfully applied to flexible electronics and thermal sensing probes in the future.

中文翻译：

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通过固-固相变可填充碳纳米管相变材料的可调电阻率

摘要

热敏材料可用于温度传感系统。在这项研究中，我们证明了碳纳米管（CNT）结合了形状稳定的相变材料（FSPCM），在相变过程中其电阻率的变化超过三个数量级。通过由于相变而由热能引起的体积变化来控制电阻率。相变材料（PCM）被聚苯胺（PANI）封装，并且在熔化和冷却过程中微囊保持固态。形状稳定的微胶囊相对于温度经历体积膨胀和收缩。因此，热膨胀系数与PCM胶囊的温度变化和体积变化有关。碳纳米管嵌入相变材料（PCM）在熔化/冷却循环中显示出卓越的电可逆性和热稳定性。我们希望CNT / PCM纳米复合材料能够在将来成功地应用于柔性电子和热传感探针。