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Monochromatic Photocathodes from Graphene-Stabilized Diamondoids.
Hao Yan1,2, Karthik T Narasimha1,2, Jonathan Denlinger3
1Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States.
Nano Letters
|December 30, 2017
Summary
A graphene coating significantly enhances the stability of diamondoid monolayers for electron sources. This protection preserves electron properties and improves thermal stability, overcoming degradation issues for advanced applications.
Area of Science:
- Materials Science
- Surface Science
- Condensed Matter Physics
Background:
- Diamondoid monolayers offer monochromatic photoemission for high-performance electron sources.
- Degradation under irradiation limits the practical application of diamondoid photocathodes.
Purpose of the Study:
- To enhance the stability of diamondoid monolayers for photocathode applications.
- To investigate the protective effect of a graphene coating on diamondoid monolayers.
Main Methods:
- Fabrication of graphene-protected diamondoid monolayer photocathodes.
- Characterization of photoemission properties and stability under irradiation.
- Thermal stability measurements and decay rate analysis under different photon energies.
Main Results:
- Graphene coating provides a 4-fold enhancement in stability compared to bare diamondoids.
- Monochromaticity of photoelectrons is preserved with a 12.5 meV energy spread.
- Thermal stability is improved by at least 100 K.
- Electron bombardment identified as the primary decay pathway under graphene protection.
Conclusions:
- Graphene protection offers a viable strategy to stabilize volatile diamondoid monolayers.
- The enhanced stability and preserved properties are crucial for developing robust electron emitters.
- This approach has broad implications for stabilizing various volatile species on surfaces for improved device performance.
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