In recent years, flexible strain sensors have garnered significant attention in industrial manufacturing and daily life. Sensitivity and reliability are two crucial characteristics of flexible strain sensors in practical applications, and they depend on the development of the sensor's internal conductive network. However, the aggregation phenomenon of conductive fillers in the elastic matrix has a serious impact on the construction of a developed conductive network. In this work, we have designed electropositive amino-functionalized carbon nanotubes (CNTs-p) based on the electrostatic self-assembly of electronegative MXene in the aqueous phase. Compared to the use of surfactants, the electrical modulation of carbon nanotubes through chemical bonding modification is more robust and the electrostatic self-assembly with MXene is more stable. CNTs-p and MXene were self-assembled by electrostatic attraction in butyl latex and uniformly dispersed in the latex. Following demulsification, the polymer composite film (MXene&CNTs-p/IIR) with a three-dimensional conductive network was obtained. The skin-like strain sensor, which utilizes the conductive composite film, demonstrates high sensitivity (gauge factor (GF) = 35137 that is among the highest values for the reported strain sensor), remarkable reliability (The signal monitoring capability remains after 15000 cycles), and excellent responsiveness (62 ms). Additionally, the skin-like strain sensor boasts a wide detection range (0–431%) and unprecedented stability, enabling strain sensing functionality in a wide temperature range of -10—100 °C, as well as strong acid (pH = 1) and strong alkali (pH = 11) environment. The preparation of MXene&CNTs-p/IIR provides a safe, environmentally friendly and effective method for improving the sensitivity and reliability of flexible sensors in wearable intelligent electronics and health detection.

中文翻译：

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静电自组装三维导电网络用于高灵敏可靠的类肤应变传感器

近年来，柔性应变传感器在工业制造和日常生活中引起了广泛关注。灵敏度和可靠性是柔性应变传感器在实际应用中的两个至关重要的特性，它们取决于传感器内部导电网络的发展。然而，导电填料在弹性基体中的聚集现象严重影响了发达导电网络的构建。在这项工作中，我们基于带负电的 MXene 在水相中的静电自组装设计了带正电的氨基功能化碳纳米管（CNT-p）。与使用表面活性剂相比，通过化学键修饰对碳纳米管的电调制更加稳健，并且与MXene的静电自组装更加稳定。CNTs-p和MXene在丁基乳胶中通过静电引力自组装并均匀分散在乳胶中。破乳后得到具有三维导电网络的聚合物复合薄膜（MXene&CNTs-p/IIR）。采用导电复合薄膜的类肤应变传感器具有高灵敏度（应变系数（GF）= 35137，是已报道的应变传感器的最高值之​​一）、卓越的可靠性（15000次循环后仍保持信号监测能力） ，以及出色的响应能力（62 毫秒）。此外，类肤应变传感器具有宽检测范围 (0–431%) 和前所未有的稳定性，可在 -10—100 °C 的宽温度范围以及强酸 (pH = 1) 下实现应变传感功能。及强碱（pH=11）环境。MXene&CNTs-p/IIR的制备为提高可穿戴智能电子和健康检测中柔性传感器的灵敏度和可靠性提供了一种安全、环保、有效的方法。