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Research Paper

Applied Science and Convergence Technology 2021; 30(2): 45-49

Published online March 30, 2021


Copyright © The Korean Vacuum Society.

Universal Transfer of 2D Materials Grown on Au Substrate Using Sulfur Intercalation

Soo Ho Choia , Ji Hoon Choib , Chang Seok Ohb , Gyeongtak Hanb , Hu Young Jeongc , Young-Min Kima , b , Soo Min Kimd , ∗ , and Ki Kang Kima , b , ∗

aCenter for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Sungkyunkwan University, Suwon 16419, Republic of Korea
bDepartment of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
cUNIST Central Research Facilities and Department of Materials Science and Engineering, UNIST, Ulsan 44919, Republic of Korea
dDepartment of Chemistry, Sookmyoung Women’s University, Seoul 14072, Republic of Korea

Correspondence to:E-mail: soominkim@sookmyung.ac.kr, kikangkim@skku.edu

Received: December 8, 2020; Revised: January 21, 2021; Accepted: January 26, 2021


Herein, we report on a novel method for transferring two-dimensional (2D) materials grown on Au substrates using sulfur intercalation between the 2D materials and the Au surfaces. The strong nature of the S–Au bond allows intercalation of sulfur atoms into their interface, under a sulfur-rich atmosphere, at 600 °C. The relaxed interfacial interaction achieved via intercalation is carefully confirmed by recovering phonon mode and work function of tungsten disulfide (WS2) in Raman spectra and Kelvin probe force microscopy, and, more importantly, by observing the expansion of the interfacial distance, from 0.24 to 0.44 nm, using cross-sectional transmission electron microscopy. The released interactions facilitate delamination of WS2 from the Au surface, using an electrochemical bubbling method. The resultant Au foil then is reused for repeated WS2 growth. The successful transfer of other 2D materials, including molybdenum disulfide and hexagonal boron nitride, is also demonstrated. Our strategy advances the use of Au substrates for growing wafer-scale 2D monolayers.

Keywords: Two-dimensional materials, Transition metal dichalcogenides, Chemical vapor deposition, Gold, Intercalation

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