1成果简介

　　激光诱导石墨烯（LIG）技术在可穿戴柔性传感器的制造领域备受关注。为提升传感器的可拉伸性，通常在制备后将LIG转移至可拉伸基底。然而该转移过程复杂且常导致石墨烯质量下降。本文，苏州大学陈立国 教授、周兴汶等研究人员在《ACS Appl. Nano Mater》期刊发表名为“In Situ Laser-Induced Graphene on PEEK/Ecoflex Composites for Stretchable Strain Sensing”的论文，研究提出基于改良可拉伸基底的原位LIG工艺。该基底通过聚醚醚酮（PEEK）与Ecoflex材料混合制备，具有优异的伸长性能，可拉伸至约480%。经优化激光加工制备的传感器具有约170Ω的初始电阻、约869的高应变系数(GF)及约20%的可测应变范围。该传感器能完美贴合人体关节，适用于基于VR的武术与拳击游戏中的动作检测，实现精准姿势识别。
　　2图文导读 

　　图1. (a) Fabrication process of the stretchable sensor. (b) Demonstration of the sensors in wearable applications. (c) Tensile properties of substrates with varying PEEK to Ecoflex ratios (pure Ecoflex, 1:5, 1:3, 1:1, and 2:1 ratios). Inset shows a morphology of the mixture with a PEEK/Ecoflex ratio of 1:1. (d) Fracture surface morphologies of the available substrates after stretching.

　　图2. (a) Resistance variation window of LIG as a function of scanning speed and DPI. (b) Resistance changes with increasing DPI at a fixed scanning speed of 360 mm/s. (c) Resistance changes with increasing scanning speed at a constant DPI of 1500. (d) SEM images of LIG fabricated under different scanning speeds and DPI values (Ecoflex:PEEK mass ratio = 1:1). (e) Raman spectra of the original substrate and processing with varied scanning speeds. (f) XPS spectra of LIG obtained at optimal parameters.

　　图3. (a) Resistance–strain curve of a typical sensor. (b) Statistical comparison of GF and ε for sensors produced with varying scanning speed. (c) Response and recovery time of the sensor. (d) Stretch-release cycling test demonstrating elastic recovery. (e) Sensing responses under a step tensile strain from 0 to 16% at 2% intervals. (f) Repeatability test through cyclic stretching.

　　图4. Applications for LIG sensors. (a–e) Measurement of human joint flexion movements using LIG sensors (demonstrated on fingers, wrist, elbow, knee, and neck). (f) Circuit of five-channel signal processing based on Arduino. (g) Sensor motion detection. (h) Wearable testing showing sensor attachment and real-time motion detection.
　　3小结
　　综上所述，我们通过在PEEK/Ecoflex复合基板上原位生成激光刻蚀（LIG）技术，成功制备了柔性传感器。Ecoflex组分增强了材料的可拉伸性，而PEEK提供的芳香族聚合物则促进了高质量石墨烯的形成，从而实现了卓越的导电性能。优化后的传感器（1:1配比）展现出出色的可拉伸性，伸长率超过480%。激光扫描速度和DPI的变化会影响激光能量输入。具有多孔石墨烯的传感器具有更高的灵敏度和更宽的线性段，这只能通过适当的激光能量输入来获得。在最佳激光参数（300毫米/秒的扫描速度和1500 DPI）下，传感器在20%应变下达到869的GF值。我们开发了五通道关节运动监测系统，通过全面的身体动作检测展现出卓越的可穿戴性。这些特性使作者的传感器成为柔性可穿戴电子设备中极具前景的组件，尤其适用于VR武术游戏应用。
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