Biodegradable Piezoelectric Force Sensor

Journal: Proceedings of the National Academy of Sciences

Author: Eli J. Curry and Thanh D. Nguyen et al.

Affiliation: University of Connecticut

Publication date: 2018.01.16

Summarized by Inyeol Yun

 

– Structure
v. PLA Encapsulator – Molybdenum – Piezo. PLLA – Molybdenum – PLA Encapsulator (Fig. 1)

fig1.png

Fig. 1

 

– Fabrication
v. Cut the Molybdenum and PLLA film.
v. The PLLA film was sandwiched between two Mo electrodes.
v. Encapsulator was sealed using a combination of the biodegradable PLLA glue and a thermal bag sealer for 4 seconds. (Fig. 2)

fig2.png

Fig. 2

 

– Principle
v. Piezoelectricity (Fig. 3)
v. PLLA : new piezoelectric material (normally not piezoelectric material) (Fig. 4)
v. PLLA -> shear stress -> nucleation -> piezoelectricity (Fig. 5)

fig3.png

Fig. 3

fig4.png

Fig. 4

fig5

Fig. 5

 

– Result
v. Vibration test: Drain ratio (DR) 2.5 output is largest but it is not conclusive optimal DR (Fig. 6)
v. Pressure – Voltage with charge amplifier circuit
v. Biocompatible, Biodegradable test (Fig. 7)
v. In-vivo test: inside the abdominal cavity of a mouse to monitor the pressure of diaphragmatic contraction (Fig. 8)

fig6.png

Fig. 6

fig7.png

Fig. 7

fig8.png

Fig. 8

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