Imaging of edge inactive layer in micro-patterned graphene monolayer

Brockdorf, Kathleen; Ji, Zhonghang; Engel, N.; Myers, J.; Mou, Shin; Huang, Hong; Zhuang, Yan

doi:10.1016/j.matlet.2017.09.110

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…It is well known that the surface plasmon resonance frequency in GNRs is a function of the width and the carrier density of the ribbons. 348 Although challenging to characterize at the nanoscale, the inactive edge has been evidenced by Raman spectroscopy 349 and microwave atomic force microscopy 350,351 to show different characteristics than in the basal plane. In addition, Fei et al 352 also reported that the carrier density is enhanced near the sample edge using near-eld infrared nanoimaging in exfoliated graphene.…”

Section: One-and Two-dimensional Defects (Topological Defects)mentioning

confidence: 99%

Various defects in graphene: a review

2022

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Section: One-and Two-dimensional Defects (Topological Defects)mentioning

confidence: 99%

Various defects in graphene: a review

2022

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“…It is postulated by Yan et al that an “inactive” area on the edge of the GNRs about 28 nm wide reduces the width of the effective area in which the plasmons oscillate. The inactive edge, albeit difficult to characterize at the nanoscale, has been evidenced by Raman spectroscopy and microwave atomic force microscopy , to show different characteristics than in the basal plane. In addition to that, Fei and Rodin et al also alluded that in exfoliated graphene, the carrier density is enhanced near the sample edge by using near-field infrared nanoimaging .…”

Section: Introductionmentioning

confidence: 99%

Edge Doping Effect to the Surface Plasmon Resonances in Graphene Nanoribbons

et al. 2019

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In this work, we investigated the edge doping effect to graphene plasmon resonances in graphene nanoribbons (GNRs), which is known to affect the electronic doping of GNRs but has not been systematically studied. We found the Fermi levels, which reflect that the sheet charge carrier densities, extracted from the graphene plasmon resonance frequencies, vary across GNRs of different widths on the same sample. Using Raman spectroscopy, we confirmed that the variation of the sheet charge carrier density is caused by edge doping, which has a stronger effect on narrower GNRs. To further understand the edge doping effect, electron beam irradiation (EBI) is applied to modify the charge state of the edge. Using EBI, we successfully demonstrated the tuning of the graphene plasmon resonances due to the change of the edge doping states. These findings demonstrated the importance of the edge doping effect in determination of the surface plasmon frequency in GNRs.

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Microwave imaging of etching-induced surface impedance modulation of graphene monolayer

Myers

Brockdorf

et al. 2018

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Impact of processing-induced structural defects on the electrical properties of a graphene monolayer has been investigated using scanning microwave microscopy (SMM). Graphene sheets grown on copper foil by chemical vapor deposition were transferred to a silicon wafer covered with a 300 nm thick thermal SiO2 layer and then patterned into a grating structure using the standard lithography technique. Raman spectroscopy and SMM were employed to monitor the defect generation and the induced surface impedance change on graphene. Correlation of the SMM image contrast shows that the etching-induced defects cause a decrease of the electrical conductivity and permittivity of the graphene monolayer. In addition, the SMM image contrast shows a frequency dependency: at higher frequencies, the permittivity of the graphene monolayer plays an important role, resulting in the SMM phase imaging contrast reversed from the low frequency measurements. Numerical simulations were performed, which are in very good agreement with the experimental results.

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Imaging of edge inactive layer in micro-patterned graphene monolayer

Cited by 3 publications

References 18 publications

Various defects in graphene: a review

Various defects in graphene: a review

Edge Doping Effect to the Surface Plasmon Resonances in Graphene Nanoribbons

Microwave imaging of etching-induced surface impedance modulation of graphene monolayer

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