Ultracomfortable Hierarchical Nanonetwork for Highly Sensitive Pressure Sensor
| Autor: | Jin Wei Cao, Fei Liang, Yang Jiang, Hai Lu Wang, Ying Wang, Xin Li, Guang Zhu, Hua Yang Li, Yu Chuan Xiao, You Jun Fan, Zhong Lin Wang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Nanofibers General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Wearable Electronic Devices law Pressure General Materials Science Electrical conductor business.industry Graphene Nanowires General Engineering Nanonetwork 021001 nanoscience & nanotechnology Pressure sensor Piezoresistive effect 0104 chemical sciences Nanofiber Electrode Optoelectronics Graphite 0210 nano-technology business Sensitivity (electronics) |
| Zdroj: | ACS nano. 14(8) |
| ISSN: | 1936-086X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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