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Laser‐Guided Microcanvas Printing of Multicolor Upconversion Nanoparticles on Molybdenum Disulfide Monolayer

Scanning focused laser beams incident on nanomaterials have provided a nondestructive and facile technique to fabricate micropatterns of a wide variety of hybrid materials. Conventionally, the technique is limited to localized chemical modification or in situ reduction of specific metal ions en route to heterogeneous material systems. However, as hybrid structures continue to be an essential form to couple various material properties and bring forth nanostructures with designable traits, the need for a flexible technique to interface nanomaterials presynthesized in higher quality remains an important challenge. Herein, a technique for laser‐guided microcanvas formation by anchoring preformed upconversion nanoparticles at specific sites on a MoS2 monolayer surface is presented. The technique expands the building blocks in laser‐produced hybrid structures to include presynthesized nanomaterials. The upconversion microstructures are formed via a microbubble‐assisted mechanism, with distinct emission contrast against the background. The proof‐of‐concept production of a multicolor upconversion microcanvas marks the potential for full‐color high‐resolution displays while the technique opens up the possibility of fabricating an expandable range of new hybrid structures.