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Related Concept Videos

Frictional Force01:07

Frictional Force

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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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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...
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Static and Kinetic Frictional Force01:05

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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Updated: May 2, 2026

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Electrically Tunable Friction at Two-Dimensional Heterointerface.

Nannan Xia1, Haojie Lang1, Haoyang Su1

  • 1College of Mechanical Engineering, Donghua University, Shanghai 201620, China.

ACS Applied Materials & Interfaces
|May 1, 2026
PubMed
Summary
This summary is machine-generated.

Researchers explored friction in graphene oxide (GO)/graphene interfaces using conductive atomic force microscopy. They found that electrical bias allows for tunable friction control, offering insights into advanced tribological systems.

Keywords:
frictiongraphene heterointerfacegraphene oxideinterfacial charge

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Tribology

Background:

  • Two-dimensional (2D) heterostructures are of significant interest in tribology due to their unique frictional properties.
  • Graphene oxide (GO) and graphene are key 2D materials with distinct electrical characteristics.

Purpose of the Study:

  • To investigate the frictional behavior of the GO/graphene heterointerface under varying bias voltages.
  • To understand the mechanisms behind electrically tunable friction in 2D materials.

Main Methods:

  • Fabrication of GO-coated conductive probes.
  • Conductive atomic force microscopy (C-AFM) to measure friction.
  • Scanning Kelvin probe microscopy and adhesion measurements to analyze interfacial properties.

Main Results:

  • Friction at the GO/graphene interface increases with applied bias, allowing for real-time, reversible control in a low-bias regime.
  • Charge accumulation at the GO/graphene interface due to dielectric GO and conductive graphene generates electrostatic forces for friction control.
  • High positive bias reduces control stability due to electron tunneling, while high negative bias causes graphene oxidation, leading to permanent friction changes.

Conclusions:

  • Electrically tunable friction in 2D heterostructures is achievable through controlled charge accumulation and interfacial interactions.
  • Understanding these mechanisms is crucial for developing smart tribological systems with adjustable friction.
  • The study provides fundamental insights into friction regulation in advanced 2D materials.