Twist angle-dependent work functions in CVD-grown twisted bilayer graphene probed by Kelvin probe force microscopy

Gu, Shangzhi; Liu, Wenyu; Mi, Shuo; Xian, Guoyu; Guo, Jianfeng; Pang, Fei; Chen, Shanshan; Hu, Yang; Gao, Hongjun; Cheng, Zhihai

doi:10.1039/d2nr07242d

Cited by 2 publications

(1 citation statement)

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“…However, the current CVD process frequently produces TBG in irregular or joint grains with arbitrary rotation angles, which poses challenges in recognizing the twist angles of the TBG. To address these challenges, a variety of techniques have been employed to characterize the rotation angles of TBG, including transmission electron microscopy (TEM), , scanning probe microscopies (SPMs), − low-energy electron microscopy/diffraction (LEEM/LEED), , and Raman spectroscopy. ,− Among them, high-resolution microscopy techniques, such as TEM and SPM, provide highly precise angle determinations with an accuracy below ∼1°. However, these characterization techniques require samples with extremely clean surfaces and are typically time-consuming and labor-intensive.…”

Section: Introductionmentioning

confidence: 99%

Angle-Resolved Optical Imaging of Interlayer Rotations in Twisted Bilayer Graphene

Tan,

Han,

Jia

et al. 2024

ACS Appl. Mater. Interfaces

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Twisted bilayer graphene (TBG) is a prototypical layered material whose properties are strongly correlated to interlayer coupling. The two stacked graphene layers with distinct orientations are investigated to generate peculiar optical and electronic phenomena. Thus, the rapid, reliable, and nondestructive twist angle identification technique is of essential importance. Here, we integrated the white light reflection spectra (WLRS), the Raman spectroscopy, and the transmission electron microscope (TEM) to propose a facile RGB optical imaging technique that identified the twist angle of the TBG in a large area intuitively with high efficiency. The RGB technique established a robust correlation between the interlayer rotation angle and the contrast difference in the RGB color channels of a standard optical image. The angle-resolved optical behavior is attributed to the absorption resonance matching with the separation of van Hove singularities in the density of states of the TBG. Our study thus developed a route to identify the rotation angle of stacked bilayer graphene by means of a straightforward optical method, which can be further applied in other stacked van der Waals layered materials.

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Section: Introductionmentioning

confidence: 99%

Angle-Resolved Optical Imaging of Interlayer Rotations in Twisted Bilayer Graphene

Tan,

Han,

Jia

et al. 2024

ACS Appl. Mater. Interfaces

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A temperature-insensitive silver nanostructures@graphene foam for high accuracy and full range human health monitoring

Xu,

Dou,

Song

et al. 2024

Rare Met.

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Twist angle-dependent work functions in CVD-grown twisted bilayer graphene probed by Kelvin probe force microscopy

Abstract: Tailoring the interlayer twist angle of bilayer graphene (BLG) significantly affects its electronic properties, including its superconductivity, topological transitions, ferromagnetic states, and correlated insulating states. These exotic electronic properties are...

Cited by 2 publications

References 59 publications

Angle-Resolved Optical Imaging of Interlayer Rotations in Twisted Bilayer Graphene

Angle-Resolved Optical Imaging of Interlayer Rotations in Twisted Bilayer Graphene

A temperature-insensitive silver nanostructures@graphene foam for high accuracy and full range human health monitoring

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