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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

350
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...
350

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Classical vs. quantum plasmon-induced molecular transformations at metallic nanojunctions.

Alexander B C Mantilla1, Chih-Feng Wang2, Andrey Krayev3

  • 1Department of Physics and Astronomy, Washington State University, Pullman, WA 99164.

Proceedings of the National Academy of Sciences of the United States of America
|March 28, 2024
PubMed
Summary

The study reveals how the transition between classical and quantum plasmons affects chemical reactions in plasmonic nanojunctions. Understanding this plasmonic chemistry is crucial for interpreting surface and tip-enhanced Raman scattering experiments.

Keywords:
localized plasmonsplasmonic chemistryquantum plasmonstip-enhanced Raman

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Area of Science:

  • Plasmonics
  • Surface Chemistry
  • Nanotechnology

Background:

  • Plasmonic nanojunctions are key for chemical transformations detected by surface-enhanced Raman (SER) and tip-enhanced Raman (TER) scattering.
  • The shift from localized to nonlocal (quantum) plasmons at nanojunctions is known, but its impact on plasmonic chemistry is unclear.

Purpose of the Study:

  • To investigate the implications of the transition between classical and quantum plasmons on plasmonic chemistry.
  • To explore molecular charging and optical rectification phenomena at nanojunctions.

Main Methods:

  • Utilized Atomic Force Microscopy (AFM) coupled with TER and current measurements.
  • Employed 4-mercaptobenzonitrile (MBN) to probe plasmonic fields and 4-nitrothiophenol (NTP) to study chemical transformations.

Main Results:

  • Established the transition from classical to quantum plasmons via optical measurements, correlating it with molecular charging and optical rectification.
  • Observed NTP transforming into its dimer (DMAB) in the classical regime, which then collapsed into anions in the quantum regime, with reversible behavior.
  • Force and current measurements corroborated the optical findings.

Conclusions:

  • The transition to quantum plasmons significantly influences chemical reactions and molecular states within plasmonic nanojunctions.
  • AFM-TER measurements provide insights into these plasmonic chemistry dynamics.
  • Both classical and quantum plasmon regimes must be considered for accurate analysis of plasmonic reactions, especially in experiments lacking precise junction control (e.g., SER, ambient TER).