A Sandwich-Structured Piezoresistive Sensor with Electrospun Nanofiber Mats as Supporting, Sensing, and Packaging Layers
| Autor: | Qingyou Xia, Feng Wang, Yan Qiao, Zhisong Lu, Zicong Zhao, Bintian Li, Liqun Xu |
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| Rok vydání: | 2018 |
| Předmět: |
human motion
Materials science Fabrication Polymers and Plastics 02 engineering and technology 010402 general chemistry Polypyrrole 01 natural sciences Article lcsh:QD241-441 chemistry.chemical_compound wearable electronics lcsh:Organic chemistry Composite material electrospinning General Chemistry vital sign 021001 nanoscience & nanotechnology Pressure sensor Piezoresistive effect Electrospinning 0104 chemical sciences piezoresistive sensor chemistry Nanofiber Finger tapping 0210 nano-technology Layer (electronics) |
| Zdroj: | Polymers; Volume 10; Issue 6; Pages: 575 Polymers Polymers, Vol 10, Iss 6, p 575 (2018) |
| ISSN: | 2073-4360 |
| Popis: | Electrospun nanofiber mats have been used as sensing elements to construct piezoresistive devices due to their large surface area and high porosity. However, they have not been utilized as skin-contact supporting layers to package conductive nanofiber networks for the fabrication of piezoresistive sensors. In this work, we developed a sandwich-structured pressure sensor, which can sensitively monitor human motions and vital signs, with electrospun nanofiber mats as supporting, sensing, and packaging layers. The nanofiber mats were prepared by electrospinning with biocompatible poly (l-lactide) (PLA), silk fibroin (SF), and collagen (COL) as raw materials. The synthesized PLA–SF–COL mat possesses a non-woven structure with a fiber diameter of 122 ± 28 nm and a film thickness of 37 ± 5.3 μm. Polypyrrole (PPy) nanoparticles were grown in-situ on the mat to form a conductive layer. After stacking the pristine and conductive mats to form a PLA–SF–COL mat/(PPy-coated mat)2 structure, another layer was electrospun to pack the multilayers for the construction of a sandwich-structured piezoresistive sensor. The as-prepared device can sensitively detect external pressures caused by coin loading and finger tapping/pressing. It can also tolerate more than 600 times of pressing without affecting its sensing capability. The human body-attached experiments further demonstrate that the sensor could real-time monitor finger/arm bending, arterial pulse, respiration rate, and speaking-caused throat vibration. The electrospinning-based fabrication may be used as a facile and low-cost strategy to produce flexible piezoresistive sensors with excellent skin-compatibility and great pressure sensing capability. |
| Databáze: | OpenAIRE |
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