铅笔“画”出柔性传感器

可穿戴设备是一种可以安装在人、动物和物品上，并能感知、传递和处理生物体生理信号的计算设备。其中，柔性传感器是可穿戴设备的关键基础部件。近日，北京科技大学的张跃教授课题组发现，通过一根铅笔和一张普通的纸，利用铅笔上带有的石墨，就能很快在生物体表面“画”出一个柔性传感器。

他们的方法是将一根碳素铅笔在普通的纸上固定一个方向涂擦几次，形成一条连续的笔迹，通过连接电极输出信号，即可轻松获得可穿戴传感器。将其粘附于关节处，便可监控显示身体的运动。该器件具有很高的灵敏度，能够快速响应，同时还能大大降低可穿戴设备的制作成本。这不仅能实现器件的高效节能环保，更重要的是能够广泛应用于人体运动学、结构安全监测、智能家居等领域。

该论文今年3月发表于Advanced Functional Materials，随后得到了《New Scientist》、《PHYS.ORG》、《新华网》等众多知名的新闻媒体和科技网站的高度关注，并成为 Advanced Functional Materials 当月访问量最高的论文。

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摘要速递

Flexible and Highly Sensitive Strain Sensors Fabricated

Advanced Functional Materials

Volume 25, Issue 16, pages 2395–2401, April 22, 2015

DOI: 10.1002/adfm.201500094

Functional electrical devices have promising potentials in structural health monitoring system, human-friendly wearable interactive system, smart robotics, and even future multifunctional intelligent room. Here, a low-cost fabrication strategy to ef? ciently construct highly sensitive graphite-based strain sensors by pencil-trace drawn on ? exible printing papers is reported.The strain sensors can be operated at only two batteries voltage of 3 V, and can be applied to variously monitoring microstructural changes and human motions with fast response/relaxation times of 110 ms, a high gauge factor(GF) of 536.6, and high stability >10000 bending–unbending cycles. Through investigation of service behaviors of the sensors, it is found that the micro-

cracks occur on the surface of the pencil-trace and have a major in? uence on the functions of the strain sensors. These performances of the strain sensor attain and even surpass the properties of recent strain sensing devices with subtle design of materials and device architectures. The pen-on-paper(PoP) approach may further develop portable, environmentally friendly, and economical lab-on-paper applications and offer a valuable method to fabricate other multifunctional devices.

铅笔“画”出柔性传感器

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