Core-shell nanofiber mats for tactile pressure sensor and nanogenerator applications. (February 2018)

• Record Type: Journal Article
• Authors: Lin, Meng-Fang; Xiong, Jiaqing; Wang, Jiangxin; Parida, Kaushik; Lee, Pooi See
• Is Part Of: Nano energy. Volume 44(2018)
• Page Start: 248
• Page End: 255
• Publication Date: 2018-02
• Subjects: Tactile pressure sensor -- Nanogenerator -- Electrospinning -- Core-shell nanofibers; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2017.12.004
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Core-shell nanofibers of PDMS ion gel /PVDF-HFP were successfully prepared by incorporating cross-linking agent during electrospinning. The electrospun nanofiber mats were used to fabricate pressure sensors to detect the static and dynamic pressures by harnessing the capacitance changes and triboelectric effects judiciously. The core-shell PDMS ion gel/PVDF-HFP nanofiber sensor functions as a capacitive pressure sensor, which offers high sensitivity of 0.43 kPa −1 in the low pressure ranges from 0.01 kPa to 1.5 kPa. The sensitivity, flexibility, and robustness of our capacitive pressure sensor allows it to be utilized as a wrist-based pulse wave detector for heart-rate monitoring. In addition, the core-shell PDMS ion gel/PVDF-HFP nanofiber mat made a good triboelectric based pressure sensor in the high pressure range with a linear pressure sensitivity 0.068 V kPa −1 from 100 kPa to 700 kPa, one of the best reported at present. The increase in inductive charges and the enhanced dielectric capacitance of the core-shell nanofiber layer compared to the pure PVDF-HFP nanofiber layer allows it to function in the triboelectric nanogenerator (TENG) with the maximum power density reaching 0.9 W/m 2, which is sufficient to light up several hundred light emitting diodes (LEDs) instantaneously. Graphical abstract: Highlights: Core-shell nanofiber mats were successfully prepared by incorporating cross-linking agent during electrospinning. The electrospun nanofibers were used to fabricate pressure sensors to detect the static and dynamic pressures. Our capacitive pressure sensor allows it to be utilized as a wrist-based pulse wave detector. The maximum power density of the nanofiber mats could be brought up to 0.9 W/m 2