Alternating aligned conductive stripes in polypropylene film with remarkable anisotropy for sensing application
Alternating aligned conductive stripes in polypropylene film with remarkable anisotropy for sensing application
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聚丙烯薄膜中交替排列的导电条纹具有显着的各向异性，适用于传感应用
DOI：
10.1016/j.snb.2020.129370
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发表时间：
2021-03
期刊：
影响因子：
--
通讯作者：
Changyu Shen
中科院分区：
文献类型：
--
作者：
Kang Zhao;Jie Wang;Weijie Deng;Chao Shen;Guoqiang Zheng;Youxi Ji;Kun Dai;Chuntai Liu;Changyu Shen
各向异性导电薄膜（ACF）在微型传感器件中具有重要意义，然而通过简单且成本有效的方法制备ACF仍然是一个巨大的挑战。本文以聚丙烯（PP）/多壁碳纳米管（MWCNTs）复合材料为基础，研制了含有定向导电条的ACF。与各向同性材料相比，它们对挥发性有机蒸气具有快速响应、高响应性和优异的可逆性。对三种有机蒸气的最大响应顺序为环己烷>二氯甲烷>乙酸乙酯，这与计算的Flory-Huggins相互作用参数一致。各向异性PP/MWCNTs薄膜（A-P/M-F）的上级有机蒸气传感性能主要归因于条带之间清晰的界面，这可以加速蒸气在这些界面处的快速吸收/脱附。此外，相邻导电条之间的空间约束强迫效应有利于内部导电网络的重构和稳定，使含有A-P/M-F排列导电条的传感器具有良好的传感稳定性。此外，它们的气敏行为表现出温度依赖性，即它随着温度的升高而增加，这是因为在较高的温度下具有较高的吸收活化能。本工作提供了一种简单而经济的方法来制备活性碳纤维，使其具有高的稳定性和令人满意的可靠性的有机蒸汽传感器的工业规模的应用。
Anisotropic conductive films (ACFs) are of great significance in miniaturized sensing devices, however it still is a huge challenge to fabricate ACFs via a facile and cost-effective method. Herein, ACFs containing aligned conductive stripes have been developed based on polypropylene (PP)/multi-walled carbon nanotubes (MWCNTs) composite. Compared with their isotropic counterparts, they demonstrate quick response, high responsivity and excellent reversibility for volatile organic vapors. The maximum responsivity toward three organic vapors is in the order of cyclohexane > dichloromethane > ethyl acetate, which is consistent with the calculated Flory-Huggins interaction parameter. The superior organic vapor sensing behavior of anisotropic PP/MWCNTs film (A-P/M-F) can be ascribed to the clear interfaces between stripes, which can accelerate the rapid absorption/desorption of vapors at such interfaces. Moreover, the spatial confining forced effect between the neighboring stripes is beneficial for reconstructing and stabilizing the internal conductive network, endowing A-P/M-F containing aligned conductive stripes with a good sensing stability. Furthermore, their vapor sensing behavior shows temperature dependence, that is, it increases with the increasing temperature because of higher absorption activation energy at higher temperature. This work provides a facile but cost-effective way to fabricate ACFs, enabling its industrial-scale application as organic vapor sensor with high stability and satisfied reliability.
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