泊松比和压阻传感：通往多模态传感能力的高性能3D柔性可拉伸传感器的新途径,Advanced Functional Materials

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泊松比和压阻传感：通往多模态传感能力的高性能3D柔性可拉伸传感器的新途径
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2016-02-19 , DOI: 10.1002/adfm.201505070
Yan Li _{1,

2} , Sida Luo _{1,

2} , Ming-Chia Yang _{1,

2} , Richard Liang _{1,

2} , Changchun Zeng _{1,

2}

Affiliation

柔性和可拉伸传感器的性能取决于柔性基板和传感元件的优化以及它们之间的协同作用。本文报道了一种新颖的策略，可以通过将碳纳米管组装到可调泊松比的多孔基板上，以经济高效且可扩展的方式制造新型多孔材料，作为3D柔性和可拉伸压阻传感器。结果表明，传感器的压阻灵敏度随着基板的泊松比的减小而增加。泊松比为负的基材（膨胀泡沫）表现出明显更高的压阻敏感性，这是由于膨胀泡沫的相干变形模式和碳纳米管网络的耐隧穿性变化增强所致。与传统的泡沫传感器相比，泊松比为–0.5的膨胀泡沫传感器（AFS）表现出压阻灵敏度提高了300％，而规格系数却提高了500％。AFS具有很高的感测能力，非常坚固，并且能够进行多模式感测，例如大变形感测，压力感测，剪切/扭转感测和水下感测。AFS在广泛的可穿戴和便携式设备应用中显示出巨大的潜力，在一系列演示中对此进行了介绍。和水下感应。AFS在广泛的可穿戴和便携式设备应用中显示出巨大的潜力，在一系列演示中对此进行了介绍。和水下感应。AFS在广泛的可穿戴和便携式设备应用中显示出巨大的潜力，在一系列演示中对此进行了介绍。

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Poisson Ratio and Piezoresistive Sensing: A New Route to High‐Performance 3D Flexible and Stretchable Sensors of Multimodal Sensing Capability

The performance of flexible and stretchable sensors relies on the optimization of both the flexible substrate and the sensing element, and their synergistic interactions. Herein, a novel strategy is reported for cost‐effective and scalable manufacturing of a new class of porous materials as 3D flexible and stretchable piezoresistive sensors, by assembling carbon nanotubes onto porous substrates of tunable Poisson ratios. It is shown that the piezoresistive sensitivity of the sensors increases as the substrate's Poisson's ratio decreases. Substrates with negative Poisson ratios (auxetic foams) exhibit significantly higher piezoresistive sensitivity, resulting from the coherent mode of deformation of the auxetic foam and enhanced changes of tunneling resistance of the carbon nanotube networks. Compared with conventional foam sensors, the auxetic foam sensor (AFS) with a Poisson's ratio of –0.5 demonstrates a 300% improvement in piezoresistive sensitivity and the gauge factor increases as much as 500%. The AFS has high sensing capability, is extremely robust, and capable of multimodal sensing, such as large deformation sensing, pressure sensing, shear/torsion sensing, and underwater sensing. AFS shows great potential for a broad range of wearable and portable devices applications, which are described by reporting on a series of demonstrations.

更新日期：2016-02-19

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