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Updated: Jan 29, 2026

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
Field emission patterns from first-principles electronic structures: application to pristine and cesium-doped carbon
Mohammad Khazaei1, Amir A Farajian, Yoshiyuki Kawazoe
1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan. khazaei@imr.edu
This study introduces a novel method to calculate field emission properties of nanostructures using first-principles calculations. Cesium adsorbates significantly boost field emission current in carbon nanotubes by over 2.5 times.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Surface Science
Background:
- Field emission is crucial for nanotechnology applications.
- Understanding electron emission from nanostructures requires advanced theoretical models.
- Experimental field emission spectroscopy provides valuable insights but needs theoretical interpretation.
Purpose of the Study:
- To develop a general, first-principles approach for calculating field emission properties of diverse nanostructures.
- To explain experimental field emission spectroscopy images using local density of states (LDOS).
- To investigate the impact of cesium adsorbates on the field emission of carbon nanotubes.
Main Methods:
- Utilizing first-principles local density of states (LDOS) and effective potentials.
- Modeling electron tunneling probability at the structure-vacuum barrier.
- Comparing theoretical predictions with experimental field emission patterns of carbon nanotubes.
Main Results:
- The developed method accurately reproduces experimental field emission patterns for pristine capped carbon nanotubes.
- Cesium adsorbates, even at low concentrations (one dopant per nanotube), enhance emission current by approximately 2.5 times.
- The enhanced emission is attributed to a generated dipole field from cesium adsorption.
Conclusions:
- The first-principles LDOS approach provides a robust framework for predicting field emission properties of nanostructures.
- Cesium doping is an effective strategy to significantly improve field emission performance in carbon nanotubes.
- This work bridges theoretical calculations and experimental observations in field emission spectroscopy.
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