Publication

NMSL Lab

Publication

Self powered pH sensor using piezoelectric composite worm structures derived by ionotropic gelation approach
Author
Nagamalleswara Rao Alluri, Sophia Selvarajan, Arunkumar Chandrasekhar, Saravanakumar Balasubramaniam, Ji Hyun Jeong, Sang-Jae Kim
Journal
Sensors and Actuators B: Chemical
Page
534-544
Year
2016

Abstract

Multifunctional biopolymer-piezoelectric composite worm structures (wavy and linear) derived by ionotropic gelation technique is fundamentally reported. Mass production of composite wavy pattern worms (CWPWs) enable high energy conversion from low frequency mechanical energy to electrical energy, tunable piezoelectricity by tailored length dependent CWPWs, weight ratio of piezoelectric nanoparticles. Interestingly we found that, the peak–peak voltage and current decreases around 87% and 71% for CWPW devices when the CWPWs length decreased to 56.4% (L = 1.95 to 0.85 cm) respectively. We also tested, the pH dependent conductivity of composite linear worm (CLW) for clinical, food monitoring applications. Next, we demonstrate the generated piezoelectric potential of CWPW device holds as a promising independent power source unit to drive the CLW sensor under different pH solutions. The proposed work is non-invasive, flexible with robustness in long-term effective usage, biocompatibility, and battery-less operation for self powered biosensor in theranostics, blood pH measurement.