Jump to main content
Jump to site search

Issue 45, 2015
Previous Article Next Article

Self-powered flexible pressure sensors with vertically well-aligned piezoelectric nanowire arrays for monitoring vital signs

Author affiliations

Abstract

Human vital signs such as the heartbeat and respiration are important physiological parameters for public health care. Precisely monitoring these very minute and complex time-dependent signals in a simple, low-cost way is still a challenge. This study shows a novel fabrication of vertically well-aligned piezoelectric nanowire arrays with preferential polarization orientation as highly sensitive self-powered sensors for monitoring vital signs. The process realizes in situ poling of the P(VDF-TrFE) nanowires within the nanopores of the anodized aluminium oxide (AAO) template to yield a preferential alignment of both nanowires and the polymer chains required for superior sensitivity in one step. The resulting self-powered flexible sensor shows high sensitivity, good stability and strong power-generating performance. Under bending conditions, the device exhibits a maximum voltage of ∼4.8 V and a current density of ∼0.11 μA cm−2. The fabricated self-powered sensor shows a linear relationship of output voltage versus compressive force with a high sensitivity, and the piezoelectric voltage of the P(VDF-TrFE) nanowire array is enhanced 9 times that of conventional spin-coated bulk films. Furthermore, the highly sensitive vertically well-aligned nanowire array can be applied as a self-powered sensor for detecting some tiny human activities including breath, heartbeat pulse, and finger movements, which may possibly serve for medical diagnostics as sensors, robotics and smart electronic devices.

Graphical abstract: Self-powered flexible pressure sensors with vertically well-aligned piezoelectric nanowire arrays for monitoring vital signs

Back to tab navigation

Supplementary files

Publication details

The article was received on 17 Jul 2015, accepted on 22 Sep 2015 and first published on 23 Sep 2015


Article type: Paper
DOI: 10.1039/C5TC02173A
Author version
available:
Download author version (PDF)
J. Mater. Chem. C, 2015,3, 11806-11814

  •   Request permissions

    Self-powered flexible pressure sensors with vertically well-aligned piezoelectric nanowire arrays for monitoring vital signs

    X. Chen, J. Shao, N. An, X. Li, H. Tian, C. Xu and Y. Ding, J. Mater. Chem. C, 2015, 3, 11806
    DOI: 10.1039/C5TC02173A

Search articles by author

Spotlight

Advertisements