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Related Experiment Video

Updated: Jun 13, 2026

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells
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Published on: November 5, 2014

Two-Step Electrophoretic Fabricated Sandwich-Structured CNT Cold Cathode With Defect-Coupled Multilevel NiOx for

Chengkun Lei1, Xiuguo Chen1, Zhuochen Zhang1

  • 1School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, P.R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|June 12, 2026
PubMed
Summary

We developed a novel carbon nanotube (CNT) cold cathode emitter using a post-annealing deposition method. This enhanced emitter shows significantly improved stability and durability for practical applications.

Keywords:
CNT cold cathodeTwo‐Step electrophoretic depositioncurrent fluctuation ratedefect couplingmulti‐level structure

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Last Updated: Jun 13, 2026

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Carbon nanotube (CNT) field emission cathodes are promising electron sources due to low turn-on fields and high current extraction.
  • Practical use is limited by current instability and performance degradation linked to CNT film structure and tunneling barriers.

Purpose of the Study:

  • To develop a stable and durable CNT cold cathode emitter.
  • To overcome the limitations of conventional CNT emitters through a novel fabrication process.

Main Methods:

  • Fabrication of an annealed-deposited CNT (a-d CNT) cold cathode emitter using a two-step electrophoretic method.
  • Incorporation of a multilevel NiOx structure with coupled CNT defects and a Ni-C-Cu elemental distribution.
  • Characterization of the emitter's field emission properties, including turn-on field, current fluctuation, and decay resistance.

Main Results:

  • The a-d CNT emitter achieved an ultralow current fluctuation rate of 2.89% at 1.6 mA.
  • A low turn-on field of 1.25 V/µm was achieved due to a compressed tunneling barrier (4.74 eV) and high field enhancement factor (β = 5444).
  • Demonstrated an 800% enhancement in current decay resistance compared to pristine CNT emitters.

Conclusions:

  • The post-annealing deposition strategy effectively enhances CNT cold cathode performance.
  • The multilevel NiOx structure and defect engineering provide efficient electron transport and improved stability.
  • This work presents a viable approach for fabricating high-performance CNT electron sources for advanced applications.