Highly Sensitive and Durable Sea-Urchin-Shaped Silver Nanoparticles Strain Sensors for Human-Activity Monitoring
Highly Sensitive and Durable Sea-Urchin-Shaped Silver Nanoparticles Strain Sensors for Human-Activity Monitoring
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用于人体活动监测的高灵敏且耐用的海胆形银纳米粒子应变传感器
DOI：
10.1021/acsami.0c22756
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发表时间：
2021
影响因子：
9.5
通讯作者：
Jin Chongjun
中科院分区：
文献类型：
--
作者：
Zou Qiushun;He Kai;Ou-Yang Jian;Zhang Yueli;Shen Yang;Jin Chongjun
高性能的应变传感器，由各种人工传感材料上/在可拉伸基板，显示出巨大的应用前景，在柔性电子器件。在这里，我们展示了一个高度敏感和耐用的应变传感器组成的一条带的紧密包装海胆形状的银纳米粒子（SUSN）夹在两层聚（二甲基硅氧烷）（PDMS）。每个SUSN都具有高密度和球形分布的尖锐刺，促进电子转导，进一步提高信号检测。这种基于SUSN的传感器具有高灵敏度（60的应变系数）和大拉伸性（高达25%）的理想集成，在拉伸传感，拓宽其在可穿戴设备中的应用。此外，它还显示出快速响应（48 ms）、良好的再现性和长期稳定性（在20%应变下>2500次循环）。它还可以用于检测压缩（灵敏度高达31.5）和折叠型弯曲变形。传感器的电阻随变形载荷而变化的传感机理是由于SUSN之间的差距变化引起的脊间接触变化和微裂纹演化。传感器的灵敏度在不同程度的应变也实现了通过控制的宽度的紧密堆积的SUSN带。对于实际演示，基于SUSN的传感器可以用作可穿戴设备，用于监测从细微变形到实质性运动的人类活动。
High-performance strain sensors, composed of various artificial sensing materials on/in stretchable substrates, show great promise for applications in flexible electronic devices. Here, we demonstrated a highly sensitive and durable strain sensor consisting of a ribbon of close-packed sea-urchin-shaped silver nanoparticles (SUSNs) sandwiched between two layers of poly(dimethylsiloxane) (PDMS). Each of SUSNs possesses high-density and spherically distributed sharp spines over the body, which promotes electron transduction and further improves signal detection. This SUSN-based sensor possesses a desirable integration of high sensitivity (a gauge factor of 60) and large stretchability (up to 25%) at tensile sensing, broadening its application in wearable devices. Moreover, it also shows fast response (48 ms), good reproducibility, and long-term stability (>2500 cycles at 20% strain). It can also be used to detect compressing (sensitivity up to 31.5) and folding-type bending deformations. The sensing mechanism, the resistance of the sensors varying as the deformation load, results from the inter-spine contacts change and the microcracks evolution caused by variation in the gap between SUSNs. The sensor’s sensitivity at different degrees of strain was also achieved by controlling the width of the close-packed SUSNs ribbon. For practical demonstration, the SUSN-based sensors could be used as wearable devices for monitoring human activities ranging from subtle deformations to substantial movements.