Ultracomfortable Hierarchical Nanonetwork for Highly Sensitive Pressure Sensor.,ACS Nano

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Ultracomfortable Hierarchical Nanonetwork for Highly Sensitive Pressure Sensor.
ACS Nano ( IF 15.8 ) Pub Date : 2020-07-21 , DOI: 10.1021/acsnano.9b10230
Xin Li _{1,

2} , You Jun Fan _{1,

2,

3} , Hua Yang Li ₄ , Jin Wei Cao ₄ , Yu Chuan Xiao _{2,

5} , Ying Wang _{1,

2} , Fei Liang _{1,

2} , Hai Lu Wang _{1,

2} , Yang Jiang _{1,

2} , Zhong Lin Wang _{1,

2,

6} , Guang Zhu _{1,

4}

Affiliation

Skin sensors are of paramount importance for flexible wearable electronics, which are active in medical diagnosis and healthcare monitoring. Ultrahigh sensitivity, large measuring range, and high skin conformability are highly desirable for skin sensors. Here, an ultrathin flexible piezoresistive sensor with high sensitivity and wide detection range is reported based on hierarchical nanonetwork structured pressure-sensitive material and nanonetwork electrodes. The hierarchical nanonetwork material is composed of silver nanowires (Ag NWs), graphene (GR), and polyamide nanofibers (PANFs). Among them, Ag NWs are evenly interspersed in a PANFs network, forming conductive pathways. Also, GR acts as bridges of crossed Ag NWs. The hierarchical nanonetwork structure and GR bridges of the pressure-sensitive material enable the ultrahigh sensitivity for the pressure sensor. More specifically, the sensitivity of 134 kPa^–1 (0–1.5 kPa) and the low detection of 3.7 Pa are achieved for the pressure sensor. Besides, the nanofibers act as a backbone, which provides effective protection for Ag NWs and GR as pressure is applied. Hence, the pressure sensor possesses an excellent durability (>8000 cycles) and wide detection range (>75 kPa). Additionally, ultrathin property (7 μm) and nanonetwork structure provide high skin conformability for the pressure sensor. These superior performances lay a foundation for the application of pressure sensors in physiological signal monitoring and pressure spatial distribution detection.

中文翻译：

适用于高灵敏度压力传感器的超舒适分层纳米网络。

皮肤传感器对于柔性可穿戴电子设备至关重要，后者在医学诊断和医疗保健监测中非常活跃。皮肤传感器非常需要超高灵敏度，大测量范围和高皮肤贴合性。在此，基于分级的纳米网络结构的压敏材料和纳米网络电极，报道了具有高灵敏度和宽检测范围的超薄柔性压阻传感器。分层纳米网络材料由银纳米线（Ag NWs），石墨烯（GR）和聚酰胺纳米纤维（PANFs）组成。其中，Ag NWs均匀地散布在PANFs网络中，形成导电路径。此外，GR充当交叉的Ag NW的桥梁。压敏材料的分层纳米网络结构和GR桥使压力传感器具有超高灵敏度。更具体地说，灵敏度为134 kPa压力传感器可实现^–1（0–1.5 kPa）和3.7 Pa的低检测。此外，纳米纤维充当主链，在施加压力时可为Ag NWs和GR提供有效的保护。因此，压力传感器具有出色的耐用性（> 8000次循环）和宽广的检测范围（> 75 kPa）。此外，超薄特性（7μm）和纳米网络结构为压力传感器提供了高度的皮肤贴合性。这些优越的性能为压力传感器在生理信号监测和压力空间分布检测中的应用奠定了基础。

更新日期：2020-08-25

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