Minimalistic, disposable wireless electrochemical sensors: Integrating self-powered amperometry with direct inductive...

Area of Science:

• Biomedical Engineering
• Electrochemical Sensing
• Wearable Technology

Background:

• Point-of-care (PoC) biomolecular sensing is crucial for rapid medical diagnosis and prognosis.
• Current wireless electrochemical sensors rely on integrated chips (RFID, Bluetooth), microcontrollers, and potentiostats, limiting miniaturization, power efficiency, and disposability.

Purpose of the Study:

• To develop a minimalistic, sensitive, and efficient wireless electrochemical sensor design.
• To enable chip-free and battery-free wireless data transmission for disposable sensing applications.

Main Methods:

• Proposed a sensor design utilizing a single active component: a light-emitting diode (LED) paired with a photoresistor.
• The LED/photoresistor pair converts analyte concentration-dependent currents into resistive changes for inductive transmission.
• Power is supplied by an integrated galvanic cell activated by bodily fluids, and the LED/photoresistor acts as a buffer for stable wireless transmission.

Main Results:

• The sensor was characterized using hydrogen peroxide (H2O2) measurements.
• Demonstrated usability by detecting uric acid in artificial urine within a diaper prototype.
• Achieved battery-free amperometry with chip-free wireless data transmission.

Conclusions:

• The proposed minimalistic sensor design offers a promising approach for cost-effective and disposable electrochemical sensing.
• Enables integration of sensitive amperometry with wireless data transmission without complex integrated circuits.
• Represents a significant step towards accessible and user-friendly point-of-care diagnostics.