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Title: Single layer graphene protective gas barrier for copper photocathodes

Abstract

Photocathodes can benefit from a thin protection layer and attain long-term stability. Graphene is potentially a good candidate for such application. In this paper, we report direct growth of single-layer graphene on single crystal Cu(110) photocathodes using chemical vapor deposition and the effective protection of copper photocathodes with graphene against degradation under atmospheric conditions. Due to the interaction and charge transfer between graphene and copper, the graphene-protected cathodes have 0.25 eV lower work function and 17% higher quantum efficiency at 250 nm compared with bare Cu cathodes. The graphene coating can protect copper photocathodes from degradation for more than 20 min in an exposure to 200 Torr of air. Finally, the validation of graphene-photocathode compatibility opens a new route to the lifetime-extension for photocathodes.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [2];  [1];  [1];  [1];  [1]
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Naval Research Lab. (NRL), Washington, DC (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA); LANL Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1475348
Alternate Identifier(s):
OSTI ID: 1985563
Report Number(s):
LA-UR-17-27470
Journal ID: ISSN 0003-6951
Grant/Contract Number:  
AC52-06NA25396; 20150394DR
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 110; Journal Issue: 4; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; photocathodes; graphene; oxides; work functions; transition metals; thermal instruments; chemical elements; chemical vapor deposition; quantum efficiency

Citation Formats

Liu, Fangze, Moody, Nathan A., Jensen, Kevin L., Pavlenko, Vitaly, Narvaez Villarrubia, Claudia W., Mohite, Aditya D., and Gupta, Gautam. Single layer graphene protective gas barrier for copper photocathodes. United States: N. p., 2017. Web. doi:10.1063/1.4974738.
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Liu, Fangze, Moody, Nathan A., Jensen, Kevin L., Pavlenko, Vitaly, Narvaez Villarrubia, Claudia W., Mohite, Aditya D., & Gupta, Gautam. Single layer graphene protective gas barrier for copper photocathodes. United States. https://doi.org/10.1063/1.4974738
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Liu, Fangze, Moody, Nathan A., Jensen, Kevin L., Pavlenko, Vitaly, Narvaez Villarrubia, Claudia W., Mohite, Aditya D., and Gupta, Gautam. Thu . "Single layer graphene protective gas barrier for copper photocathodes". United States. https://doi.org/10.1063/1.4974738. https://www.osti.gov/servlets/purl/1475348.
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@article{osti_1475348,
title = {Single layer graphene protective gas barrier for copper photocathodes},
author = {Liu, Fangze and Moody, Nathan A. and Jensen, Kevin L. and Pavlenko, Vitaly and Narvaez Villarrubia, Claudia W. and Mohite, Aditya D. and Gupta, Gautam},
abstractNote = {Photocathodes can benefit from a thin protection layer and attain long-term stability. Graphene is potentially a good candidate for such application. In this paper, we report direct growth of single-layer graphene on single crystal Cu(110) photocathodes using chemical vapor deposition and the effective protection of copper photocathodes with graphene against degradation under atmospheric conditions. Due to the interaction and charge transfer between graphene and copper, the graphene-protected cathodes have 0.25 eV lower work function and 17% higher quantum efficiency at 250 nm compared with bare Cu cathodes. The graphene coating can protect copper photocathodes from degradation for more than 20 min in an exposure to 200 Torr of air. Finally, the validation of graphene-photocathode compatibility opens a new route to the lifetime-extension for photocathodes.},
doi = {10.1063/1.4974738},
journal = {Applied Physics Letters},
number = 4,
volume = 110,
place = {United States},
year = {Thu Jan 26 00:00:00 EST 2017},
month = {Thu Jan 26 00:00:00 EST 2017}
}
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https://doi.org/10.1063/1.4974738
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    Works referencing / citing this record:

    Free-Standing Bialkali Photocathodes Using Atomically Thin Substrates
    journal, April 2018

    • Yamaguchi, Hisato; Liu, Fangze; DeFazio, Jeffrey
    • Advanced Materials Interfaces, Vol. 5, Issue 13
    • DOI: 10.1002/admi.201800249

    Quantum Efficiency Enhancement of Bialkali Photocathodes by an Atomically Thin Layer on Substrates
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    • Yamaguchi, Hisato; Liu, Fangze; DeFazio, Jeffrey
    • physica status solidi (a), Vol. 216, Issue 23
    • DOI: 10.1002/pssa.201900501

    Active bialkali photocathodes on free-standing graphene substrates
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    Quantum Efficiency Enhancement of Bialkali Photocathodes by an Atomically Thin Layer on Substrates
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    • Yamaguchi, Hisato; Liu, Fangze; DeFazio, Jeffrey
    • physica status solidi (a), Vol. 216, Issue 23
    • DOI: 10.1002/pssa.201970076
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