Abstract
Here we optimized the electrophoretic deposition process for the fabrication of WS2 plasmonic nanohole integrated structures. We showed how the conditions used for site-selective deposition influenced the properties of the deposited flakes. In particular, we investigated the effect of different suspension buffers used during the deposition both in the efficiency of the process and in the stability of WS2 flakes, which were deposited on an ordered arrays of plasmonic nanostructures. We observed that a proper buffer can significantly facilitate the deposition process, keeping the material stable with respect to oxidation and contamination. Moreover, the integrated plasmonic structures that can be prepared with this process can be applied to enhanced spectroscopies and for the preparation of 2D nanopores.
Highlights
Over the last decade, two-dimensional (2D) materials have attracted much interest and intensive scientific endeavor has been devoted to their investigation
Interest has been broadened to other types of 2D materials like boron nitride (BN); transition metal dichalcogenides (TMDs) such as MoS2 and WS2 ; transition metal oxides (TMOs); as well as others including black phosphorous, silicene, etc. [1,2,3,4]
We have recently proposed and demonstrated the possibility to control the deposition of single layer MoS2 flakes on metallic nanostructures by means of chemical conjugation and electrophoretic deposition (EPD) [19,20]
Summary
Two-dimensional (2D) materials have attracted much interest and intensive scientific endeavor has been devoted to their investigation. [1,2,3,4] These materials are under deep investigation due to their diverse properties and potential applications spanning from photonics, electronics, biosensing and catalysis [5,6,7]. In order to find application in photonics and plasmonics, the 2D material (e.g., XS2 layers) must be integrated with suitable metallic or dielectric nanostructures [13,15,16,17,18]. This can be Materials 2019, 12, 3286; doi:10.3390/ma12203286 www.mdpi.com/journal/materials
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