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@article{ART003208679},
author={Minwook Kim and Van Huy Nguyen and Sunil Kumar and Sohee Lee and Muhammad Suleman and Zhigang Jiang and Takashi Taniguchi and Kenji Watanabe and Yongho Seo},
title={Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications},
journal={Carbon Letters},
issn={1976-4251},
year={2025},
volume={35},
number={2},
pages={803-812},
doi={10.1007/s42823-024-00829-8}

TY - JOUR
AU - Minwook Kim
AU - Van Huy Nguyen
AU - Sunil Kumar
AU - Sohee Lee
AU - Muhammad Suleman
AU - Zhigang Jiang
AU - Takashi Taniguchi
AU - Kenji Watanabe
AU - Yongho Seo
TI - Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications
JO - Carbon Letters
PY - 2025
VL - 35
IS - 2
PB - Korean Carbon Society
SP - 803
EP - 812
SN - 1976-4251
AB - Mechanical exfoliation has been a preferred method for obtaining various two-dimensional (2D) materials due to its ability to produce high-quality thin flakes. However, traditional exfoliation techniques often yield flakes of limited size and low yield. Herein, we present a systematic approach to improve mechanical exfoliation by using vacuum treatment to enhance the van der Waals forces between the substrate and the 2D material. This method comprises oxygen plasma cleaning followed by vacuum treatment, effectively removing organic adsorbates from the substrate and maximizing contact between the outermost layer of 2D material and the substrate. This vacuum-assisted exfoliation approach substantially enhances both the yield and flake size of graphene, resulting in single-layer graphene (SLG) flakes approximately eighty times larger than those achieved through conventional methods. The quality of the exfoliated SLG was assessed using Raman spectroscopy and atomic force microscopy (AFM), which confirmed that it is highly similar to that obtained from conventional exfoliation. Furthermore, the exfoliated SLG flakes were encapsulated between hexagonal boron nitride (hBN) layers and fabricated into SLG field-effect transistors (FETs). These devices exhibited high-performance characteristics, yielding a field-effect mobility (µ) of approximately 110,000at room condition, demonstrating the effectiveness of the vacuum-assisted exfoliation method in producing high-quality, large-area graphene suitable for advanced electronic applications.
KW - 2D materials;Graphene;Mechanical exfoliation;Van der Waals forces;Electrical transport characteristics
DO - 10.1007/s42823-024-00829-8
ER -

Minwook Kim, Van Huy Nguyen, Sunil Kumar, Sohee Lee, Muhammad Suleman, Zhigang Jiang, Takashi Taniguchi, Kenji Watanabe and Yongho Seo. (2025). Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications. Carbon Letters, 35(2), 803-812.

Minwook Kim, Van Huy Nguyen, Sunil Kumar, Sohee Lee, Muhammad Suleman, Zhigang Jiang, Takashi Taniguchi, Kenji Watanabe and Yongho Seo. 2025, "Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications", Carbon Letters, vol.35, no.2 pp.803-812. Available from: doi:10.1007/s42823-024-00829-8

Minwook Kim, Van Huy Nguyen, Sunil Kumar, Sohee Lee, Muhammad Suleman, Zhigang Jiang, Takashi Taniguchi, Kenji Watanabe, Yongho Seo "Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications" Carbon Letters 35.2 pp.803-812 (2025) : 803.

Minwook Kim, Van Huy Nguyen, Sunil Kumar, Sohee Lee, Muhammad Suleman, Zhigang Jiang, Takashi Taniguchi, Kenji Watanabe, Yongho Seo. Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications. 2025; 35(2), 803-812. Available from: doi:10.1007/s42823-024-00829-8

Minwook Kim, Van Huy Nguyen, Sunil Kumar, Sohee Lee, Muhammad Suleman, Zhigang Jiang, Takashi Taniguchi, Kenji Watanabe and Yongho Seo. "Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications" Carbon Letters 35, no.2 (2025) : 803-812.doi: 10.1007/s42823-024-00829-8

Minwook Kim; Van Huy Nguyen; Sunil Kumar; Sohee Lee; Muhammad Suleman; Zhigang Jiang; Takashi Taniguchi; Kenji Watanabe; Yongho Seo. Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications. Carbon Letters, 35(2), 803-812. doi: 10.1007/s42823-024-00829-8

Minwook Kim; Van Huy Nguyen; Sunil Kumar; Sohee Lee; Muhammad Suleman; Zhigang Jiang; Takashi Taniguchi; Kenji Watanabe; Yongho Seo. Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications. Carbon Letters. 2025; 35(2) 803-812. doi: 10.1007/s42823-024-00829-8

Minwook Kim, Van Huy Nguyen, Sunil Kumar, Sohee Lee, Muhammad Suleman, Zhigang Jiang, Takashi Taniguchi, Kenji Watanabe, Yongho Seo. Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications. 2025; 35(2), 803-812. Available from: doi:10.1007/s42823-024-00829-8

Minwook Kim, Van Huy Nguyen, Sunil Kumar, Sohee Lee, Muhammad Suleman, Zhigang Jiang, Takashi Taniguchi, Kenji Watanabe and Yongho Seo. "Vacuum-assisted exfoliation method for large-area, high-quality graphene flakes in nanodevice applications" Carbon Letters 35, no.2 (2025) : 803-812.doi: 10.1007/s42823-024-00829-8