Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Van der Waals Interactions01:24

Van der Waals Interactions

64.4K
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.
64.4K
Van der Waals Equation01:10

Van der Waals Equation

4.3K
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.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
4.3K
P-N junction01:11

P-N junction

603
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
603
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

429
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...
429
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

307
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...
307
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.1K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Designing effective single-molecule electromagnets with radially π-conjugated carbon structures.

Nature communications·2026
Same author

Scanning Tunneling Microscope-Based Break-Junction TechniqueA Tutorial.

ACS physical chemistry Au·2026
Same author

A Computationally Efficient and Accurate Method for Predicting Conductance of Single-Molecule Junctions.

Nano letters·2026
Same author

Responses of growth, photosynthesis, leaf microstructural properties, and bioactive compounds of Dendrobium fimbriatum to different light intensities.

BMC plant biology·2026
Same author

An Accurate Charge-Aware Machine-Learning Interatomic Potential for the Reduction of Li-Ion Battery Electrolytes in Solution.

Journal of chemical theory and computation·2026
Same author

Mapping Research Trends in Traditional Chinese Medicine Exercises for Anxiety Intervention Using a Knowledge Approach.

Journal of multidisciplinary healthcare·2025

Related Experiment Video

Updated: Aug 15, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

9.7K

Voltage-Modulated van der Waals Interaction in Single-Molecule Junctions.

Yujing Wei1, Liang Li1, Julia E Greenwald1

  • 1Department of Chemistry, Columbia University, New York, New York10027, United States.

Nano Letters
|January 5, 2023
PubMed
Summary
This summary is machine-generated.

We developed a new method to study how molecular geometry impacts single-molecule junction conductance. This technique reveals distinct electronic properties influenced by molecule-electrode interactions, particularly van der Waals forces.

Keywords:
conductance decayfast Fourier transformmolecular conformationmolecular junctionssingle-moleculevan der Waals interaction

More Related Videos

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

9.7K
Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
10:37

Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy

Published on: March 16, 2020

9.7K

Related Experiment Videos

Last Updated: Aug 15, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

9.7K
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

9.7K
Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
10:37

Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy

Published on: March 16, 2020

9.7K

Area of Science:

  • Molecular Electronics
  • Condensed Matter Physics
  • Surface Science

Background:

  • Experimentally probing molecular geometry's effect on electronic properties in single-molecule junctions is difficult.
  • Traditional break-junction methods involve mechanically evolving electrode separation, complicating precise geometric control.

Purpose of the Study:

  • To investigate the influence of junction geometry on the electrical conductance of single-molecule junctions.
  • To develop a method for simultaneously measuring conductance and current-voltage nonlinearity as a function of junction geometry.

Main Methods:

  • Applying sinusoidal modulation to the electrode position of metal-molecule-metal junctions.
  • Simultaneously probing current-voltage nonlinearity using bias modulation at a different frequency.
  • Analyzing junction conductance using Fourier transforms of the modulated signals.

Main Results:

  • Statistically distinguishable Fourier-transformed conductances were observed for junctions with different molecule-electrode interfaces.
  • A significant bias dependence was found for junction modulation where transmission is mediated by van der Waals (vdW) interactions.
  • The findings suggest voltage-modulated vdW interactions play a key role at the single-molecule level.

Conclusions:

  • The developed modulation technique allows for sensitive detection of geometric effects on single-molecule junction conductance.
  • Van der Waals interactions at the molecule-electrode interface are crucial and exhibit voltage-dependent modulation.
  • This work provides new insights into controlling and understanding electronic transport in molecular junctions.