Public Research Seminar by Advanced Materials Thrust, Function Hub, HKUST(GZ) - Wafer-Scale Single-Crystal 2D Materials and Van Der Waals Heterostructures
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In recent years, there has been significant interest in two-dimensional (2D) materials within the scientific community. The development of next-generation highly integrated nanodevices necessitates high-quality 2D materials. However, the synthesis of high-quality wafer-scale single-crystal 2D material films on metal and insulating substrates using the chemical vapor deposition (CVD) method is still challenging. To realize the growth of high-quality, industrially applicable 2D materials, several problems must be addressed, including the complex underlying growth mechanisms, reliance on metal-substrate catalysis, control of crystal morphology and quality, and integration of 2D materials into nanodevices.
In this presentation, I will first discuss strategies for growing high-quality 2D materials while controlling their morphology and crystal quality. This study explores critical factors influencing the shape and quality of 2D materials during CVD growth, guiding the achievement of controllable growth of high-quality wafer-scale single-crystal 2D materials. After that, I will introduce our past study on the epitaxial growth of wafer-scale single-crystal graphene at the interface between Cu(111) and Al2O3(0001) using a multi-cycle plasma etching-assisted CVD approach. Following this, I will present our recent work on non-epitaxial universal synthesis of wafer-scale single-crystal 2D materials on insulating substrates. This study achieved the growth of high-quality monolayer and few-layered graphene and hBN on arbitrary insulating substrates with high efficiency. Furthermore, Furthermore, I will discuss our research on the fabrication of functionalized 2D materials and 2D van der Waals heterostructures. Finally, I will introduce the potential applications by combining high-quality 2D materials with machine learning techniques.
Dr. Tian is currently a Postdoctoral Research Fellow at Nanyang Technological University (NTU). He received his BSc in physics at Xiamen University in 2015. He obtained his PhD in Materials Science and Engineering from King Abdullah University of Science and Technology (KAUST) in 2022 and was selected as the winner of the Outstanding PhD Thesis Award of the Carbon Journal Prize by Elsevier in 2023. Following his doctoral studies, Dr. Tian served as a research associate and visiting scientist at KAUST from 2023 to 2024. His research interests span physics, CVD growth, 2D materials, van der Waals heterostructures, and artificial intelligence areas. His research work has been published as first-author or corresponding author in esteemed journals such as Nature Materials, Advanced Materials, Advanced Science, and Nano Letters. Dr. Tian actively participates in the scientific community by serving as Editorial Advisory Board member of Carbon and invited referee for numerous peer-reviewed journals, including Nature Nanotechnology, Nature Communications, Applied Physics Letters, Materials Today Chemistry, and many other ACS and IEEE journals.