Flexible polymer‐metal oxide nanocomposites with multiwalled carbon nanotube (MWCNT) films were fabricated using poly(vinylidene fluoride) (PVDF) as the bulk matrix material with three‐dimensional (3D) lithium‐doped zinc oxide (Li‐ZnO) as a filler. Li‐ZnO was synthesized hydrothermally followed by surface modification with polyethylene glycol (PEG). PEG coating served as an effective solution for avoiding costly electrical poling and enhanced the proportion of the PVDF ß‐phase while MWCNTs acted to increase conductivity and to reinforce the composite during mechanical stressing. The piezoelectric composite was fabricated with 12 wt% surface modified Li‐ZnO with 0.2 wt% MWCNT relative to the bulk PVDF. The fabricated composite was tested with different body motions and in different environments. The highest obtained value of open circuit voltage was 10.1 V and 2740 µA amperometric alternating current with bending motions. It was also observed that the electrical signal fluctuated by about 200 µA due to micro‐relaxation and micro‐stressing under constant‐stress conditions. The piezoelectric nanocomposite showed a linear response to gradual increases in normal stress.

Surface Modified Nanostructured Piezoelectric Device as Cost-Effective Transducer for Energy and Biomedicine

Danti, Serena
Penultimo
;
2019-01-01

Abstract

Flexible polymer‐metal oxide nanocomposites with multiwalled carbon nanotube (MWCNT) films were fabricated using poly(vinylidene fluoride) (PVDF) as the bulk matrix material with three‐dimensional (3D) lithium‐doped zinc oxide (Li‐ZnO) as a filler. Li‐ZnO was synthesized hydrothermally followed by surface modification with polyethylene glycol (PEG). PEG coating served as an effective solution for avoiding costly electrical poling and enhanced the proportion of the PVDF ß‐phase while MWCNTs acted to increase conductivity and to reinforce the composite during mechanical stressing. The piezoelectric composite was fabricated with 12 wt% surface modified Li‐ZnO with 0.2 wt% MWCNT relative to the bulk PVDF. The fabricated composite was tested with different body motions and in different environments. The highest obtained value of open circuit voltage was 10.1 V and 2740 µA amperometric alternating current with bending motions. It was also observed that the electrical signal fluctuated by about 200 µA due to micro‐relaxation and micro‐stressing under constant‐stress conditions. The piezoelectric nanocomposite showed a linear response to gradual increases in normal stress.
2019
Chowdhury, Aminur Rashid; Jaksik, Jared; Hussain, Istiak; Tran, Phong; Danti, Serena; Uddin, Mohammed Jasim
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/952541
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