School of Science Department of Physics 53 Department of Physics Reliable Transfer of 2D Materials on Patterned Substrates Supervisor: CHAN Ho Bun / PHYS Student: CHEN Zixuan / PHYS Course: UROP 1100, Fall Graphene is renowned for its extraordinary properties, making it a focal point in science and engineering. A main challenge in graphene's practical applications lies in the transfer process from a metal substrate to the desired target substrate. This study explores different coating materials (wax, CAB, camphor) and separation methods (etching, electrochemical bubbling) on graphene transfer, and the pros and cons of different coating materials and separation methods are analyzed. The study provides insights into optimizing materials and methods to produce a more uniform, cleaner, monolayer and large-area structure after the transfer. Fabrication of Moiré Superlattices from Exfoliated 2D Materials Supervisor: JAECK Berthold / PHYS Student: CHEUNG Siu Hang / PHYS-IRE CHIU Kwok On / PHYS Course: UROP 1000, Summer UROP 1000, Summer The twist bilayer graphene (TBG) system is formed by stacking two layers of graphene with a slight twist angle between them. It has provided a new platform for strong correlated Physics and revolutionized the study of strong correlated phenomena and topological systems in reduced dimensions. This project is a continuation of the previous semester. We will first briefly discuss the physics in graphene and the methodology of quantum microscopy, these are the fundamentals that support our observation on the TBG stack. Then, we will introduce the scotch tape method and its variation that used to exfoliate 2D materials. Fabrication of Moiré Superlattices from Exfoliated 2D Materials Supervisor: JAECK Berthold / PHYS Student: CHIU Kwok On / PHYS Course: UROP 1100, Spring The exploration of moiré superlattices has revealed their potential to create novel materials with unique physical properties. This study investigates the properties of monolayer graphene paired with thin hexagonal boron nitride (HBN) to uncover new material applications. We employed the scotch tape method to mechanically exfoliate highly oriented pyrolytic graphite (HOPG) and HBN, successfully isolating monolayer graphene and suitable HBN samples. Meanwhile, silicon dioxide (SiO2) wafers were used as substrates for their optical properties, facilitating the observation and verification of exfoliated materials via optical and atomic force microscopy (AFM). The rest of the work that needs to be done is utilizing the hot pick-up technique to transfer and stack up these samples. As a result, we could study their property which contributes to our fundamental understanding for further discovering the properties of moiré superlattices.
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