Tunable optical properties of transition metal dichalcogenide nanoparticles synthesized by femtosecond laser ablation and fragmentation
JOURNAL OF MATERIALS CHEMISTRY C(2023)
摘要
Manipulation of resonant dielectric nanostructures is of paramount importance for next-generation photonic devices. Traditionally, researchers use two-dimensional or phase-change materials for this purpose. However, the former leads to small efficiency, while the latter lacks continuous changes. Here, we provide an alternative approach through laser-induced modification. Specifically, via a laser ablation process we synthesized molybdenum disulfide (MoS2) nanoparticles (NPs), the composition of which we then controlled through laser fragmentation. It causes a transformation of MoS2 into its oxide MoO3-x, which, in turn, results in pronounced modification of the optical response, owing to a large difference between their optical constants. In addition, laser-fragmented NPs have a several times larger photothermal response, compared to the original MoS2 and classical silicon NPs. Thus, our MoS2-based laser-tunable NPs open up a new perspective for resonant nanophotonics, in particular, photothermal therapy.
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关键词
dichalcogenide nanoparticles,femtosecond laser ablation,laser ablation,tunable optical properties
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