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Related Concept Videos

Field Effect Transistor01:29

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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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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
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Updated: Mar 22, 2026

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Electronic Biosensing with Functionalized rGO FETs.

Ciril Reiner-Rozman1,2, Caroline Kotlowski3,4, Wolfgang Knoll5,6

  • 1Center for Electrochemical Surface Technology (CEST), Wiener Neustadt 2700, Austria. rozman.ciril.fl@ait.ac.at.

Biosensors
|April 26, 2016
PubMed
Summary

Reduced graphene oxide biosensors offer sensitive, label-free detection for medical diagnostics and food safety. This technology presents a promising alternative to optical sensors, enabling easy analysis and remote monitoring.

Keywords:
FETaflatoxinsantigen-antibody interactionbiosensingfood toxinsliquid-gateodorant-binding proteinsolfactionreceptor immobilizationreduced graphene oxide (rGO graphene)smell sensor

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Reduced graphene oxide (rGO) offers unique electronic properties for biosensor development.
  • Existing biosensor technologies often face limitations in sensitivity, cost, or ease of use.

Purpose of the Study:

  • To explore the potential of rGO-based electronic devices as novel biosensors.
  • To demonstrate the application of rGO biosensors in medical diagnostics, food safety, and smell sensing.

Main Methods:

  • Development of rGO-based field-effect transistor (FET) sensors.
  • Immobilization of biomolecules (e.g., antibody, odorant binding protein) onto the rGO gate.
  • Label-free electronic signal detection and analysis.

Main Results:

  • rGO biosensors exhibit high sensitivity, label-free detection, and cost-effectiveness.
  • Demonstrated successful detection of antibody-antigen interactions and aflatoxins.
  • Successfully recorded honey flavor and a cancer marker (homovanillic acid) using an immobilized honey bee odorant binding protein.

Conclusions:

  • rGO-based electronic devices represent a versatile platform for developing new classes of biosensors.
  • These biosensors are a promising alternative to optical sensors, offering advantages in multiplexing, remote control, and NFC compatibility.
  • The technology holds significant potential for applications in medical diagnostics, food safety, and environmental monitoring.