Formation Mechanism of Secondary Electron Contrast of Graphene Layers on a Metal Substrate | Zendy

Kota Shihommatsu | Zendy; Junro Takahashi | Zendy; Yuta Momiuchi | Zendy; Yudai Hoshi | Zendy; Hiroki Kato | Zendy; Yoshikazu Homma | Zendy

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Formation Mechanism of Secondary Electron Contrast of Graphene Layers on a Metal Substrate

Author(s) -

Kota Shihommatsu,

Junro Takahashi,

Yuta Momiuchi,

Yudai Hoshi,

Hiroki Kato,

Yoshikazu Homma

Publication year - 2017

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.7b01550

Subject(s) - graphene , scanning electron microscope , materials science , substrate (aquarium) , electron , graphene nanoribbons , monatomic gas , secondary electrons , graphene oxide paper , metal , nanotechnology , chemistry , composite material , physics , metallurgy , geology , oceanography , organic chemistry , quantum mechanics

Scanning electron microscopy (SEM) is widely used to observe graphene on metal substrates. However, the origin of the SEM image contrast of graphene is not well understood. In this work, we performed in situ SEM imaging of layer-number-controlled graphene on a Ni substrate using a high-pass energy filter for secondary electrons. We found that the graphene layer contrast was maximized at 15-20 eV, corresponding to the π-σ* interband transition in graphene. Our results indicate that the SEM image of graphene is produced by attenuation of the electrons emitted from the metal substrate by the monoatomic layers of graphene.

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