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];
[2];
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Naval Research Lab. (NRL), Washington, DC (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (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
- Report Number(s):
- LA-UR-17-27470
Journal ID: ISSN 0003-6951
- Grant/Contract Number:
- AC52-06NA25396
- 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.
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
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.
@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 = {2017},
month = {1}
}
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Works referencing / citing this record:
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