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Electrolyte-Gated Ionic Transistor for Highly Sensitive and Selective Iontronic Sensing.

Ying Liu1,2, Tianyi Xiong1,2, Wenjie Ma1

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, The Chinese Academy of Sciences (CAS), Beijing 100190, China.

ACS Sensors
|January 7, 2025
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Summary

Researchers developed a highly sensitive iontronic sensor using an electrolyte-gated ionic transistor (EGIT) in a micropipet. This novel device amplifies ion signals, enabling precise detection of neurochemicals like ATP for improved health monitoring.

Keywords:
ionic transistorsiontronic sensorsiontronicsmicrodialysateneurochemical analysis

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Area of Science:

  • Nanotechnology
  • Biosensing
  • Transducer Technology

Background:

  • Iontronic sensors utilizing confined spaces show promise for biological applications.
  • Limited sensitivity of current iontronic sensors hinders molecular analysis in physiological and pathological processes.

Purpose of the Study:

  • To develop a highly sensitive and selective iontronic sensor by integrating confined ion transport with an electrolyte-gated transistor.
  • To investigate the signal amplification mechanism in the developed sensor.
  • To demonstrate the sensor's utility in detecting neurochemicals in biological samples.

Main Methods:

  • Fabrication of an electrolyte-gated ionic transistor (EGIT) within a double-barreled micropipet.
  • Utilizing confined ion transport and transistor configuration for signal amplification.
  • Employing finite element simulations and experimental validation to understand signal amplification due to intensified electric fields.

Main Results:

  • The EGIT achieved high sensitivity and selectivity for neurochemicals like ATP, dopamine, and serotonin.
  • Signal amplification of up to 2 orders of magnitude was observed at a gate voltage below 1 V.
  • Successful detection of trace ATP in rat striatum microdialysate was accomplished.

Conclusions:

  • The developed EGIT offers a novel and highly sensitive platform for biochemical sensing.
  • This approach expands transistor applications and provides a new method for constructing sensitive iontronic sensors.
  • Potential applications include health monitoring and disease diagnosis.