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Multi-Functional Hydrogel-Interlayer RF/NFC Resonators as a Versatile Platform for Passive and Wireless Biosensing.

Manik Dautta¹, Muhannad Alshetaiwi¹, Alberto Escobar²

¹Department of Electrical Engineering and Computer Science, University of California Irvine, Irvine, CA 92697, USA.

Advanced Electronic Materials

|March 21, 2022

Summary

New wireless sensors use hydrogel-interlayer radio-frequency resonators for passive, healthcare monitoring. These microelectronics-free devices offer wireless readout and cellphone compatibility for broad applications.

Keywords:

RFid sensors hydrogel electronics passive radio-frequency stretchable wearable sensors wireless

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Published on: September 19, 2017

Area of Science:

Materials Science
Electrical Engineering
Biomedical Engineering

Background:

Wearable sensors are crucial for monitoring human body state.
Existing sensors often lack essential features like passivity, wireless readout, and specificity for healthcare.
There is a need for advanced, accessible sensing technologies.

Purpose of the Study:

To demonstrate a versatile platform for passive and wireless biosensing using hydrogel-interlayer radio-frequency resonators.
To develop sensor systems compatible with standard mobile devices for easy data acquisition.
To create soft, conformable sensor skins for integrated human body monitoring.

Main Methods:

Fabrication of radio-frequency resonators using a vinyl cutter with hydrogel interlayers.
Tuning resonator sensitivity by modifying hydrogel composition for specific analytes or physical signals.
Integration of resonators with LEDs to form near-field communication (NFC) sensor circuits.
Assembly of resonator arrays into soft silicone sensor skins.

Main Results:

Demonstrated hydrogel-interlayer resonators as a passive, wireless sensing platform.
Enabled direct quantification of sensor state via cellphone and eye using NFC technology.
Developed soft, wireless sensor skins capable of co-reading analytical and physical signals.
Achieved low-cost, accessible sensor fabrication and integration.

Conclusions:

Hydrogel-interlayer radio-frequency resonators offer a promising, versatile solution for passive wireless biosensing.
The developed NFC-based sensor circuits and sensor skins are suitable for emerging healthcare applications.
This low-cost, accessible platform has transformative potential for integrated environmental and body monitoring.