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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Bipolar Junction Transistor01:22

Bipolar Junction Transistor

Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational characteristics.
The structure...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no current...
Field Effect Transistor01:29

Field Effect Transistor

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...
MOSFET01:16

MOSFET

The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...

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Updated: May 14, 2026

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
07:51

Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection

Published on: February 1, 2022

Monolithic graphene transistor biointerface.

SungWoo Nam1, Mi-Sun Lee, Jang-Ung Park

  • 1Department of Bioengineering, University of California, Berkeley, CA 94720, USA. nam@berkeley.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|February 1, 2013
PubMed
Summary
This summary is machine-generated.

We developed flexible all-carbon bioelectronics using integrated graphene and graphite. These devices show robust electromechanical properties and real-time pH sensing, paving the way for advanced biosensors.

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Area of Science:

  • Materials Science
  • Bioelectronics
  • Nanotechnology

Background:

  • Graphene and graphite offer unique electronic properties.
  • Developing integrated carbon-based materials is crucial for advanced bioelectronics.
  • Existing bioelectronic systems face challenges in flexibility and biocompatibility.

Purpose of the Study:

  • To report the monolithic integration of graphene and graphite for all-carbon bioelectronics.
  • To demonstrate the tunable electrical properties of graphene and graphite based on layer number.
  • To investigate the electromechanical properties and chemical sensing capabilities of these integrated devices.

Main Methods:

  • Monolithic integration of graphene and graphite layers.
  • Modulation of electrical properties by controlling graphene layer count.
  • Mechanical deformation testing to assess electromechanical stability.
  • Real-time pH detection using the integrated bioelectronic system.

Main Results:

  • Graphene and graphite properties were successfully modulated by layer control, enabling use as active channels and interconnects.
  • Monolithic graphene-graphite devices exhibited excellent mechanical flexibility and robustness.
  • Electrical responses remained stable despite mechanical deformation, highlighting unique electromechanical properties.
  • Real-time, complementary pH detection demonstrated the chemical sensing capability.

Conclusions:

  • Monolithic integration of graphene and graphite creates versatile all-carbon bioelectronics.
  • These devices possess unique, stable electromechanical properties and sensing capabilities.
  • Future applications include advanced chemical/biological detection and conformal bio-interfacing.