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Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Van der Waals Equation01:10

Van der Waals Equation

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The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
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Molecular Orbital Theory II03:51

Molecular Orbital Theory II

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Molecular Orbital Energy Diagrams
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Valence Bond Theory02:42

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Related Experiment Video

Updated: Dec 29, 2025

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
04:57

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

Published on: July 18, 2025

878

One-dimensional van der Waals heterostructures.

Rong Xiang1, Taiki Inoue2, Yongjia Zheng2

  • 1Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan. xiangrong@photon.t.u-tokyo.ac.jp maruyama@photon.t.u-tokyo.ac.jp.

Science (New York, N.Y.)
|February 1, 2020
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel one-dimensional (1D) van der Waals heterostructures by coaxially stacking hexagonal boron nitride (BN) and molybdenum disulfide (MoS2) nanotubes on carbon nanotubes (SWCNTs), enabling new material functionalities.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Van der Waals heterostructures offer tunable properties by stacking 2D materials.
  • 1D van der Waals heterostructures are challenging to synthesize due to strain and assembly complexities.

Purpose of the Study:

  • To experimentally synthesize and characterize 1D van der Waals heterostructures.
  • To demonstrate the coaxial stacking of hexagonal boron nitride (BN) and molybdenum disulfide (MoS2) on single-walled carbon nanotubes (SWCNTs).

Main Methods:

  • Coaxial stacking of single-crystal BN and MoS2 layers onto SWCNTs.
  • Synthesis of larger-diameter SWCNTs to mitigate strain effects.
  • Electron diffraction for structural verification of synthesized heterostructures.

Main Results:

  • Successful synthesis of 1D van der Waals heterostructures with coaxially stacked BN and MoS2 on SWCNTs.
  • Demonstration of a 5nm-diameter heterostructure with inner SWCNT, middle BN nanotube, and outer MoS2 nanotube.
  • Electron diffraction confirmed single-crystal nature of all shells in the heterostructures.

Conclusions:

  • The experimental synthesis of 1D van der Waals heterostructures is feasible.
  • This approach allows for the creation of diverse, function-designable 1D heterostructures from existing 2D materials.
  • The findings open pathways for novel 1D nanomaterials with tailored electronic and physical properties.