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Scanning transmission election microscopy observations of twisted epitaxial gold nanodiscs in twisted molybdenum
Yi Cui1, Pawel Czaja1, Yi Cui1
1Department of Materials Science and Engineering, Stanford University, Stanford 94305, USA.
Abstract:
Atomic scale, scanning transmission electron microscopy (STEM) analysis of the moiré structures in twisted epitaxial gold nanodiscs encapsulated in twisted bilayer molybdenum disulfide is presented. High angle annular dark field STEM imaging reveals that the period of the moiré patterns between gold and molybdenum disulfide varies with different twist angles of the bilayer molybdenum disulfide, ranging from 1.80 nm (epitaxial alignment of gold) to 1.53 nm (twisted epitaxial alignment of gold). Additionally, bright field STEM imaging reveals a faint, larger "moiré of moiré" structure in cases where the bilayer molybdenum disulfide twist angle is small (∼6°), arising from the overlapping three-layers, which is not visible in conventional transmission electron microscopy images. Our experiments indicate that scanning transmission electron microscopy as a suitable tool for moiré analysis of twisted multilayer planar heterostructures, complementary to information provided by conventional transmission electron microscopy and diffraction.
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