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Title: Monochromatic Photocathodes from Graphene-Stabilized Diamondoids

Abstract

The monochromatic photoemission from diamondoid monolayers provides a new strategy to create electron sources with low energy dispersion and enables compact electron guns with high brightness and low beam emittance for aberration-free imaging, lithography, and accelerators. However, these potential applications are hindered by degradation of diamondoid monolayers under photon irradiation and electron bombardment. Here, we report a graphene-protected diamondoid monolayer photocathode with 4-fold enhancement of stability compared to the bare diamondoid counterpart. The single-layer graphene overcoating preserves the monochromaticity of the photoelectrons, showing 12.5 meV ful width at half-maximum distribution of kinetic energy. Importantly, the graphene coating effectively suppresses desorption of the diamondoid monolayer, enhancing its thermal stability by at least 100 K. Furthermore, by comparing the decay rate at different photon energies, we identify electron bombardment as the principle decay pathway for diamondoids under graphene protection. As a result, this provides a generic approach for stabilizing volatile species on photocathode surfaces, which could greatly improve performance of electron emitters.

Authors:
ORCiD logo [1];  [1];  [2];  [1]; ORCiD logo [2];  [2];  [3];  [3];  [4];  [4]; ORCiD logo [4]; ORCiD logo [2];  [5];  [1]
  1. Stanford Univ., Stanford, CA (United States); Stanford Institute for Materials and Energy Sciences, Stanford, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Stanford Institute for Materials and Energy Sciences, Stanford, CA (United States)
  4. Justus-Liebig Univ., Giessen (Germany)
  5. Stanford Institute for Materials and Energy Sciences, Stanford, CA (United States); Stanford Univ., Stanford, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1530340
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 18; Journal Issue: 2; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
diamondoid; graphene; monochromatic; photoemission; negative electron affinity

Citation Formats

Yan, Hao, Narasimha, Karthik T., Denlinger, Jonathan, Li, Fei Hua, Mo, Sung -Kwan, Hohman, J. Nathan, Dahl, Jeremy E. P., Carlson, Robert M. K., Tkachenko, Boryslav A., Fokin, Andrey A., Schreiner, Peter R., Hussain, Zahid, Shen, Zhi -Xun, and Melosh, Nicholas A. Monochromatic Photocathodes from Graphene-Stabilized Diamondoids. United States: N. p., 2017. Web. doi:10.1021/acs.nanolett.7b04645.
Yan, Hao, Narasimha, Karthik T., Denlinger, Jonathan, Li, Fei Hua, Mo, Sung -Kwan, Hohman, J. Nathan, Dahl, Jeremy E. P., Carlson, Robert M. K., Tkachenko, Boryslav A., Fokin, Andrey A., Schreiner, Peter R., Hussain, Zahid, Shen, Zhi -Xun, & Melosh, Nicholas A. Monochromatic Photocathodes from Graphene-Stabilized Diamondoids. United States. doi:10.1021/acs.nanolett.7b04645.
Yan, Hao, Narasimha, Karthik T., Denlinger, Jonathan, Li, Fei Hua, Mo, Sung -Kwan, Hohman, J. Nathan, Dahl, Jeremy E. P., Carlson, Robert M. K., Tkachenko, Boryslav A., Fokin, Andrey A., Schreiner, Peter R., Hussain, Zahid, Shen, Zhi -Xun, and Melosh, Nicholas A. Fri . "Monochromatic Photocathodes from Graphene-Stabilized Diamondoids". United States. doi:10.1021/acs.nanolett.7b04645. https://www.osti.gov/servlets/purl/1530340.
@article{osti_1530340,
title = {Monochromatic Photocathodes from Graphene-Stabilized Diamondoids},
author = {Yan, Hao and Narasimha, Karthik T. and Denlinger, Jonathan and Li, Fei Hua and Mo, Sung -Kwan and Hohman, J. Nathan and Dahl, Jeremy E. P. and Carlson, Robert M. K. and Tkachenko, Boryslav A. and Fokin, Andrey A. and Schreiner, Peter R. and Hussain, Zahid and Shen, Zhi -Xun and Melosh, Nicholas A.},
abstractNote = {The monochromatic photoemission from diamondoid monolayers provides a new strategy to create electron sources with low energy dispersion and enables compact electron guns with high brightness and low beam emittance for aberration-free imaging, lithography, and accelerators. However, these potential applications are hindered by degradation of diamondoid monolayers under photon irradiation and electron bombardment. Here, we report a graphene-protected diamondoid monolayer photocathode with 4-fold enhancement of stability compared to the bare diamondoid counterpart. The single-layer graphene overcoating preserves the monochromaticity of the photoelectrons, showing 12.5 meV ful width at half-maximum distribution of kinetic energy. Importantly, the graphene coating effectively suppresses desorption of the diamondoid monolayer, enhancing its thermal stability by at least 100 K. Furthermore, by comparing the decay rate at different photon energies, we identify electron bombardment as the principle decay pathway for diamondoids under graphene protection. As a result, this provides a generic approach for stabilizing volatile species on photocathode surfaces, which could greatly improve performance of electron emitters.},
doi = {10.1021/acs.nanolett.7b04645},
journal = {Nano Letters},
number = 2,
volume = 18,
place = {United States},
year = {2017},
month = {12}
}

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