A wireless chemical sensor using ferroparticles embedded hydrogel

J. H. Park, S. H. Song, G. Chitnis, Ronald A Siegel, B. Ziaie

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

In this paper, we present a wireless chemical sensor using ferroparticles-embedded hydrogel (ferrogel). Chemically triggered reversible swelling and de-swelling of ferrogel immobilized on top of a planar inductor results in a modulated inductance through two competing mechanisms; ferroparticle density and magnetic field passing through the volume-changing ferrogel. Overall, the effect of the magnetic flux passing through the ferrogel dominates, thus increasing the inductance as the ferrogel swells. The resulting inductance change can be remotely monitored through wireless tracking of the coil self-resonant frequency. A pH sensor based on poly (methacrylic acid-co-acrylamide) hydrogel was fabricated and tested. The test was carried out in a laser machine acrylic chamber with buffers of varying pH values flowing through while monitoring the resonant frequency with a network analyzer. The sensor shows sensitivity of 200 kHz/pH between pH values of 6 to 5 and 105 kHz/pH from 5 to 4 with approximately 30 minutes of response time.

Original languageEnglish (US)
Title of host publication2013 Transducers and Eurosensors XXVII
Subtitle of host publicationThe 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013
Pages1735-1738
Number of pages4
DOIs
StatePublished - Dec 1 2013
Event2013 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013 - Barcelona, Spain
Duration: Jun 16 2013Jun 20 2013

Publication series

Name2013 Transducers and Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013

Other

Other2013 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013
CountrySpain
CityBarcelona
Period6/16/136/20/13

Keywords

  • Chemical sensor
  • Hydrogel
  • Poly acrylamide
  • Poly methacrylic acid
  • Superparamagnetic ferroparticles

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