Highly Sensitive, Flexible, and Wearable Pressure Sensor Based on a Giant Piezocapacitive Effect of Three-Dimensional Microporous Elastomeric Dielectric Layer
Highly Sensitive, Flexible, and Wearable Pressure Sensor Based on a Giant Piezocapacitive Effect of Three-Dimensional Microporous Elastomeric Dielectric Layer
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DOI：
10.1021/acsami.6b04225
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发表时间：
2016-07-06
影响因子：
9.5
通讯作者：
Park, Inkyu
中科院分区：
文献类型：
--
作者：
Kwon, Donguk;Lee, Tae-Ik;Park, Inkyu
我们报道了一种基于三维（3-D）微孔介电弹性体的巨大压电电容效应的柔性和可穿戴压力传感器，该传感器能够在大的触觉压力范围内进行高度灵敏和稳定的压力传感。由于弹性体介电层内存在微孔，我们的压容压力传感器即使在非常小的压力下也能高度变形，从而显著提高其灵敏度。此外，微孔在压缩下的逐渐闭合增加了有效介电常数，从而进一步增强了传感器的灵敏度。与先前报道的微/纳米结构传感材料相比，具有串联堆叠的弹性体桥弹簧的3-D微孔介电层可以覆盖更宽的压力范围。我们还调查了我们的传感器的可穿戴压力传感设备的适用性，作为一个电子压力传感皮肤在机器人手指，以及绷带型压力传感设备在人类手腕的脉搏监测。最后，我们展示了一个压力传感器阵列垫的空间分布的压力信息在一个平面上的识别。我们的传感器具有出色的压力传感性能，标志着真正的触觉压力传感器的实现，该传感器对整个触觉压力范围（从超低力检测到人类活动产生的高重量）都具有高度灵敏的响应。
We report a flexible and wearable pressure sensor based on the giant piezocapacitive effect of a three-dimensional (3-D) microporous dielectric elastomer, which is capable of highly sensitive and stable pressure sensing over a large tactile pressure range. Due to the presence of micropores within the elastomeric dielectric layer, our piezocapacitive pressure sensor is highly deformable by even very small amounts of pressure, leading to a dramatic increase in its sensitivity. Moreover, the gradual closure of micropores under compression increases the effective dielectric constant, thereby further enhancing the sensitivity of the sensor. The 3-D microporous dielectric layer with serially stacked springs of elastomer bridges can cover a much wider pressure range than those of previously reported micro-/nanostructured sensing materials. We also investigate the applicability of our sensor to wearable pressure-sensing devices as an electronic pressure-sensing skin in robotic fingers as well as a bandage-type pressure-sensing device for pulse monitoring at the human wrist. Finally, we demonstrate a pressure sensor array pad for the recognition of spatially distributed pressure information on a plane. Our sensor, with its excellent pressure-sensing performance, marks the realization of a true tactile pressure sensor presenting highly sensitive responses to the entire tactile pressure range, from ultralow-force detection to high weights generated by human activity.