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Position‐Controlled Fabrication of Vertically Aligned Mo/MoS 2 Core–Shell Nanopillar Arrays
Author(s) -
Maduro Louis,
Noordam Marc,
Bolhuis Maarten,
Kuipers Laurens,
ConesaBoj Sonia
Publication year - 2022
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202107880
Subject(s) - nanopillar , materials science , nanotechnology , fabrication , wafer , nanostructure , silicon , shell (structure) , optoelectronics , composite material , medicine , alternative medicine , pathology
The fabrication of 2D materials, such as transition metal dichalcogenides (TMDs), in geometries beyond the standard platelet‐like configuration exhibits significant challenges which severely limit the range of available morphologies. These challenges arise due to the anisotropic character of their bonding van der Waals out‐of‐plane while covalent in‐plane. Furthermore, industrial applications based on TMD nanostructures with non‐standard morphologies require full control on the size‐, morphology‐, and position on the wafer scale. Such a precise control remains an open problem of which solution would lead to the opening of novel directions in terms of optoelectronic applications. Here, a novel strategy to fabricate position‐controlled Mo/MoS 2 core–shell nanopillars (NPs) is reported on. Metal‐Mo NPs are first patterned on a silicon wafer. These Mo NPs are then used as scaffolds for the synthesis of Mo/MoS 2 core/shell NPs by exposing them to a rich sulfur environment. Transmission electron microscopy analysis reveals the core/shell nature of the NPs. It is demonstrated that individual Mo/MoS 2 NPs exhibits significant nonlinear optical processes driven by the MoS 2 shell, realizing a precise localization of the nonlinear signal. These results represent an important step towards realizing 1D TMD‐based nanostructures as building blocks of a new generation of nanophotonic devices.