Single layer graphene protective gas barrier for copper photocathodes

Liu, Fangze; Moody, Nathan A.; Jensen, Kevin L.; Pavlenko, Vitaly; Narvaez Villarrubia, Claudia W.; Mohite, Aditya D.; Gupta, Gautam

doi:10.1063/1.4974738

Title: Single layer graphene protective gas barrier for copper photocathodes

Journal Article · 26 January 2017 · Applied Physics Letters

DOI: https://doi.org/10.1063/1.4974738 · OSTI ID:1475348

Liu, Fangze ^[1];

^[1];

^[2]; Pavlenko, Vitaly ^[1]; Narvaez Villarrubia, Claudia W. ^[1]; Mohite, Aditya D. ^[1]; Gupta, Gautam ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Naval Research Lab. (NRL), Washington, DC (United States)

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.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA); LANL Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-06NA25396; 20150394DR

OSTI ID:: 1475348

Alternate ID(s):: OSTI ID: 1985563

Report Number(s):: LA-UR-17-27470

Journal Information:: Applied Physics Letters, Vol. 110, Issue 4; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Active bialkali photocathodes on free-standing graphene substrates Yamaguchi, Hisato; Liu, Fangze; DeFazio, Jeffrey npj 2D Materials and Applications, Vol. 1, Issue 1 https://doi.org/10.1038/s41699-017-0014-6	journal	June 2017
Overcoming the quantum efficiency-lifetime tradeoff of photocathodes by coating with atomically thin two-dimensional nanomaterials Wang, Gaoxue; Yang, Ping; Moody, Nathan A. npj 2D Materials and Applications, Vol. 2, Issue 1 https://doi.org/10.1038/s41699-018-0062-6	journal	June 2018
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
photocathodes
graphene
oxides
work functions
transition metals
thermal instruments
chemical elements
chemical vapor deposition
quantum efficiency

Title: Single layer graphene protective gas barrier for copper photocathodes

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