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Related Concept Videos

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Related Experiment Video

Updated: Sep 1, 2025

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Graphene-Based Ion-Selective Field-Effect Transistor for Sodium Sensing.

Ting Huang1, Kan Kan Yeung1,2, Jingwei Li1,3

  • 1Biomedical Engineering Department, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.

Nanomaterials (Basel, Switzerland)
|August 12, 2022
PubMed
Summary

Researchers developed scalable graphene-based ion-sensitive field-effect transistor (ISFET) arrays for real-time sodium ion monitoring. These sensors offer high sensitivity and selectivity for health monitoring applications.

Keywords:
grapheneion-selective field-effect transistorreal-time monitoringsodium ions

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Field-effect transistors (FETs) are crucial for sensitive, label-free chemical sensing and clinical diagnostics.
  • Graphene's unique electronic properties make it an attractive material for advanced sensor development.

Purpose of the Study:

  • To fabricate and characterize graphene-based ion-sensitive field-effect transistor (ISFET) arrays for real-time sodium ion monitoring.
  • To evaluate the sensitivity, selectivity, and real-time performance of the developed graphene ISFETs (G-ISFETs).

Main Methods:

  • Scalable photolithographic fabrication of graphene ISFET arrays.
  • Real-time monitoring of sodium ion concentration using current-gate voltage characteristics.
  • Conducting time-dependent and interfering ion experiments to assess sensor performance.

Main Results:

  • G-ISFETs demonstrated a wide detection range for sodium ions (10-8 to 10-1 M) with a sensitivity of 152.4 mV/dec.
  • The sensors exhibited a fast response time and remarkable selectivity against common interfering ions (Ca2+, K+, Mg2+, NH4+).
  • Negative shifts in current-gate voltage curves indicated successful sodium ion capture and detection.

Conclusions:

  • The fabricated G-ISFETs offer a promising platform for continuous, real-time sodium sensing.
  • The combination of scalability, high sensitivity, and selectivity makes G-ISFETs suitable for health monitoring applications.
  • This technology advances label-free biosensing capabilities for clinical diagnosis.