Monochromatic Photocathodes from Graphene-Stabilized Diamondoids

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.

doi:10.1021/acs.nanolett.7b04645

Title: Monochromatic Photocathodes from Graphene-Stabilized Diamondoids

Journal Article · Fri Dec 29 00:00:00 EST 2017 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.7b04645· OSTI ID:1530340

^[1]; Narasimha, Karthik T. ^[1]; Denlinger, Jonathan ^[2]; Li, Fei Hua ^[1];

^[2]; Hohman, J. Nathan ^[2]; Dahl, Jeremy E. P. ^[3]; Carlson, Robert M. K. ^[3]; Tkachenko, Boryslav A. ^[4]; Fokin, Andrey A. ^[4];

^[4];

^[2]; Shen, Zhi -Xun ^[5]; Melosh, Nicholas A. ^[1]

Stanford Univ., Stanford, CA (United States); Stanford Institute for Materials and Energy Sciences, Stanford, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Stanford Institute for Materials and Energy Sciences, Stanford, CA (United States)
Justus-Liebig Univ., Giessen (Germany)
Stanford Institute for Materials and Energy Sciences, Stanford, CA (United States); Stanford Univ., Stanford, CA (United States)

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.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1530340

Journal Information:: Nano Letters, Vol. 18, Issue 2; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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References (20)

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Common surface structures of graphene and Au(111): The effect of rotational angle on adsorption and electronic properties Yortanlı, Merve; Mete, Ersen The Journal of Chemical Physics, Vol. 151, Issue 21 https://doi.org/10.1063/1.5127099	journal	December 2019
Common surface structures of graphene and Au(111) : The effect of rotational angle on adsorption and electronic properties Yortanlı, Merve; Mete, Ersen arXiv https://doi.org/10.48550/arxiv.1909.03652	text	January 2019

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