Abstract Thermal films based on carbon nanotube (CNT) composite film have attracted focus in practical applications. This paper develops a highly flexible and multi-role CNT/Polyimide (PI) composite film by employing the dielectrophoresis technique to incorporate bundles of SWCNT into patterned PI substrates. The CNT composite film with a nickel conductive layer exhibits a tunable temperature coefficient of resistivity (TCR) while vacuum thermally treated at diverse temperature. The evolution of the TCR could be controlled from the negative correlation (reached −15000 ppm/°C) to the positive (up to nearly 10000 ppm/°C), which is mainly determined by the reform of the tube connection and covalent bonds in composites due to accumulated thermal energy of annealing, resulting in the change of charge transport. Moreover, the transient response of film devices annealed at different temperature could remain on the order of microseconds proving the robustness of the technology. Demonstrations in human body temperature sensing and micro wind tunnel flow measuring represent excellent sensitivity and reproducibility. The proposed thermal film based on CNT/PI composite with a tunable resistance-temperature characteristic gives a great application potential in intelligent protection electronics, sensing elements and other related thermal applications.

中文翻译：

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具有可调电阻温度系数的高效碳纳米管/聚酰亚胺复合材料用于多功能热膜

摘要 基于碳纳米管（CNT）复合薄膜的热敏薄膜在实际应用中备受关注。本文通过采用介电泳技术将单壁碳纳米管束结合到图案化的 PI 基板中，开发了一种高度灵活且多功能的 CNT/聚酰亚胺 (PI) 复合膜。具有镍导电层的 CNT 复合膜在不同温度下进行真空热处理时表现出可调的电阻率温度系数 (TCR)。TCR的演变可以从负相关（达到-15000 ppm/°C）到正相关（高达近10000 ppm/°C）进行控制，这主要取决于管连接和共价键的改革。复合材料由于退火积累的热能，导致电荷传输的变化。而且，在不同温度下退火的薄膜器件的瞬态响应可以保持在微秒量级，证明了该技术的稳健性。人体温度传感和微风洞流量测量的演示代表了出色的灵敏度和再现性。所提出的基于 CNT/PI 复合材料的具有可调电阻温度特性的热膜在智能保护电子、传感元件和其他相关热应用中具有巨大的应用潜力。