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High Crystallinity Vertical Few-Layer Graphene Grown Using Template Method Assisted ICPCVD Approach.

Tianzeng Hong1, Runze Zhan1, Yu Zhang1

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|November 11, 2022
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Summary

Researchers developed a template method using a copper mask to synthesize high-quality vertical few-layer graphene (VFLG). This technique significantly enhances VFLG crystallinity and field emission properties for advanced electronic applications.

Keywords:
crystallinityfield emissiontemplatevertical few-layer graphene

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Vertical few-layer graphene (VFLG) is crucial for applications like electron emission, sensors, and energy storage.
  • Achieving high crystallinity and low defects in VFLG synthesis remains a challenge for optimal performance.

Purpose of the Study:

  • To introduce a novel template method for the controllable synthesis of high-crystallinity VFLG (HCVFLG).
  • To investigate the impact of the template method on VFLG structural properties and field emission characteristics.

Main Methods:

  • A copper mask was employed as a template during high-density plasma-enhanced deposition.
  • The copper mask served a dual role: protecting VFLG from ion etching and directing gas flow for enhanced growth.
  • Raman spectroscopy and Transmission Electron Microscopy (TEM) were used to analyze VFLG crystallinity.

Main Results:

  • The template method significantly improved the crystallinity of VFLG, confirmed by Raman and TEM analysis.
  • HCVFLG exhibited a large field emission current (up to 93 μA for a single sheet) and a low turn-on field.
  • The maximum current density of HCVFLG film reached 67.15 mA/cm², 2.6 times higher than VFLG grown without a mask.

Conclusions:

  • The copper mask template method provides a practical strategy for the controllable synthesis of high-quality VFLG.
  • This approach enables pattern growth of VFLG and enhances its performance in field emission applications.
  • Contacted interface damage leading to substrate detachment was identified as the vacuum breakdown mechanism for HCVFLG.