DocumentCode :
4884
Title :
Aligned PVDF-TrFE Nanofibers With High-Density PVDF Nanofibers and PVDF Core–Shell Structures for Endovascular Pressure Sensing
Author :
Sharma, Toshi ; Naik, Sapan ; Langevine, Jewel ; Gill, Brijesh ; Zhang, John X. J.
Author_Institution :
Biomed. Eng. Dept., Univ. of Texas at Austin, Austin, TX, USA
Volume :
62
Issue :
1
fYear :
2015
fDate :
Jan. 2015
Firstpage :
188
Lastpage :
195
Abstract :
Nanostructures of polyvinyledenedifluoride-tetrafluoroethylene (PVDF-TrFE), a semicrystalline polymer with high piezoelectricity, results in significant enhancement of crystallinity and better device performance as sensors, actuators, and energy harvesters. Using electrospinning of PVDF to manufacture nanofibers, we demonstrate a new method to pattern high-density, highly aligned nanofibers. To further boost the charge transfer from such a bundle of nanofibers, we fabricated novel core-shell structures. Finally, we developed pressure sensors utilizing these fiber structures for endovascular applications. The sensors were tested in vitro under simulated physiological conditions. We observed significant improvements using core-shell electrospun fibers (4.5 times gain in signal intensity, 4000 μV/mmHg sensitivity) over PVDF nanofibers (280 μV/mmHg). The preliminary results showed that core-shell fiber-based devices exhibit nearly 40-fold higher sensitivity, compared to the thin-film structures demonstrated earlier.
Keywords :
biomedical materials; biomedical measurement; core-shell nanostructures; electrospinning; nanobiotechnology; nanofibres; piezoelectric materials; polymer fibres; pressure sensors; PVDF core-shell structures; PVDF-TrFE nanofibers; electrospinning; endovascular pressure sensing; high density PVDF nanofibers; piezoelectricity; polyvinyledenedifluoride-tetrafluoroethylene; semicrystalline polymer; signal intensity gain; Catheters; Electrodes; Optical fiber sensors; Polymers; Testing; Core???shell; catheter; nanofibers; polyvinyle-denedifluoride-tetrafluoroethylene (PVDF-TrFE); pressure sensor;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/TBME.2014.2344052
Filename :
6868286
Link To Document :
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