title: Aligned MoO2/MoS2and MoO2/MoTe2Freestanding Core/Shell Nanoplates Driven by Surface Interactions.
abstract: Controlling the growth of two-dimensional (2D) transition metal dichalcogenides (TMDCs) is an important step toward utilizing these materials for either electronics or catalysis. Here, we report a new surface-templated growth method that enables the fabrication of MoO2/MoS2and MoO2/MoTe2core/shell nanoplates epitaxially aligned on (0001)-oriented 4H-silicon carbide and sapphire substrates. These heterostructures are characterized by a variety of techniques to identify the chemical and structural nature of the interface. Scanning electron microscopy shows that the nanoplates feature 3-fold symmetry indicative of epitaxial growth. Raman spectroscopy indicates that the MoO2/MoS2nanoplates are composed of co-localized MoO2and MoS2, and transmission electron microscopy confirms that the nanoplates feature MoO2cores with 2D MoS2coatings. Locked-coupled X-ray diffraction shows that the interfacial planes of the MoO2nanoplate cores belong to the {010} and {001} families. This method may be further generalized to create novel nanostructured interfaces with single-crystal substrates.
authors.affiliation: Department of Chemistry, University of Minnesota , Minneapolis, Minnesota 55455, United States.
authors.forename: Zachary P
authors.initials: ZP
authors.lastname: DeGregorio
authors.affiliation: Department of Chemistry, University of Minnesota , Minneapolis, Minnesota 55455, United States.
authors.forename: Youngdong
authors.initials: Y
authors.lastname: Yoo
authors.affiliation: Department of Chemistry, University of Minnesota , Minneapolis, Minnesota 55455, United States.
authors.forename: James E
authors.identifier: http://orcid.org/0000-0001-6164-0384
authors.initials: JE
authors.lastname: Johns