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Coupling and decoupling of bilayer graphene monitored by electron energy loss spectroscopy
Yung-Chang Lin, Amane Motoyama, Pablo Solis-Fernandez +3
We studied the interlayer coupling and decoupling of bilayer graphene (BLG) by using spatially resolved electron energy loss spectroscopy (EELS) with a monochromated electron sourc…
Excitonic effects in energy loss spectra of freestanding graphene
Alberto Guandalini, Ryosuke Senga, Yung-Chang Lin +8
In this work we perform electron energy-loss spectroscopy (EELS) of freestanding graphene with high energy and momentum resolution to disentangle the quasielastic scattering from t…
Mixed-Salt Enhanced Chemical Vapor Deposition of Two-Dimensional Transition Metal Dichalcogenides
Shisheng Li, Yung-Chang Lin, Jinhua Hong +9
The usage of molten salts, e.g., Na2MoO4 and Na2WO4, has shown great success in the growth of two-dimensional (2D) transition metal dichalcogenides (TMDCs) by chemical vapor deposi…
Tunable Doping of Rhenium and Vanadium into Transition Metal Dichalcogenides for Two-Dimensional Electronics
Shisheng Li, Jinhua Hong, Bo Gao +10
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) with unique electrical properties are fascinating materials used for future electronics. However, the strong Fermi lev…
Does the metallic 1T phase WS2 really exist?
Yung-Chang Lin, Hideaki Nakajima, Chung-Wei Tseng +5
The electronic and optical properties of transition metal dichalcogenides (TMDCs) in distinctive phases, such as 1H, 1T, and 1T' phases, are of fundamental importance for variety o…
Wafer-Scale and Deterministic Patterned Growth of Monolayer MoS2 via Vapor-Liquid-Solid Method
Shisheng Li, Yung-Chang Lin, Xu-Ying Liu +12
Vapor transportation is the core process in growing transition-metal dichalcogenides (TMDCs) by chemical vapor deposition (CVD). One inevitable problem is the spatial inhomogeneity…
Vapor-Liquid-Solid Growth of Monolayer MoS2 Nanoribbons
Shisheng Li, Yung-Chang Lin, Wen Zhao +19
Chemical vapor deposition (CVD) of two-dimensional (2D) materials such as monolayer MoS2 typically involves the conversion of vapor-phase precursors to a solid product in a process…
Towards atomically precise manipulation of 2D nanostructures in the electron microscope
Toma Susi, Demie Kepaptsoglou, Yung-Chang Lin +4
Despite decades of research, the ultimate goal of nanotechnology--top-down manipulation of individual atoms--has been directly achieved with only one technique: scanning probe micr…
The structure and local chemical properties of boron-terminated tetravacancies in hexagonal boron-nitride
Ovidiu Cretu, Yung-Chang Lin, Masanori Koshino +3
Imaging and spectroscopy performed in a low-voltage scanning transmission electron microscope (LV-STEM) are used to characterize the structure and chemical properties of boron-term…
Properties of Individual Dopant Atoms in Single-Layer MoS2: Atomic Structure, Migration, and Enhanced Reactivity
Yung-Chang Lin, Dumitru O. Dumcenco, Hannu-Pekka Komsa +4
The differences in the behavior of Re (n-type) and Au (p-type) dopant atoms in single-layered MoS2 were investigated by in situ scanning transmission electron microscopy. Re atoms…
Atomic mechanism of phase transition between metallic and semiconducting MoS2 single-layers
Yung-Chang Lin, Dumitru O. Dumcenco, Ying-Sheng Huang +1
Structural transformation between metallic (1T) and semiconducting (2H) phases of single-layered MoS2 was systematically investigated by an in situ STEM with atomic precision. The…