Au@MoS₂ Core–Shell Heterostructures with Strong Light–Matter Interactions

Abstract

There are emerging opportunities to harness diverse and complex geometric architectures based on nominal two-dimensional atomically layered structures. Herein we report synthesis and properties of a new core-shell heterostructure, termed Au@MoS, where the Au nanoparticle is snugly and contiguously encapsulated by few shells of MoS atomic layers. The heterostructures were synthesized by direct growth of multilayer fullerene-like MoS shell on Au nanoparticle cores. The Au@MoS heterostructures exhibit interesting light-matter interactions due to the structural curvature of MoS shell and the plasmonic effect from the underlying Au nanoparticle core. We observed significantly enhanced Raman scattering and photoluminescence emission on these heterostructures. We attribute these enhancements to the surface plasmon-induced electric field, which simulations show to mainly localize within the MoS shell. We also found potential evidence for the charge transfer-induced doping effect on the MoS shell. The DFT calculations further reveal that the structural curvature of MoS shell results in a modification of its electronic structure, which may facilitate the charge transfer from MoS to Au. Such Au@MoS core-shell heterostructures have the potential for future optoelectronic devices, optical imaging, and other energy-environmental applications.

MoS2 and Perylene Derivative Based Type‐II Heterostructure: Bandgap Engineering and Giant Photoluminescence Enhancement

“…As a result, PL behavior of MoS 2 can be significantly tailored. [6,21,22] To our knowledge, the enhanced PL emission of TMDs could be achieved with the combination of organic semiconductors, such as pentacene, [3] perylene tetracarboxylic dianhydride, [23] titanyl phthalocyanine, [24] and inorganic materials such as lead iodide, [4] ZnO nanorods, [25] 2D layer (BN, MoTe 2 ), [26,27] and metal nanoparticles, [28,29] via charge carrier/energy transfer, strain relaxation, and surface plasmon effects. [3,4,20] In contrast, for TMD hybrid heterostructures with a type-II (staggered) band alignment photoinduced carriers can transfer through the interface and be separated at different material due to the large band offsets.…”

Synthesis and Characterization of Pb@GaS Core–Shell Fullerene-Like Nanoparticles and Nanotubes

“…Core-shell nanoparticles [21][22][23] -in particular those with a lamellar sul¯de shell 24 -have been reported previously. Here, we focus on the¯rst synthesis and characterization speci¯cally of core-shell IF-Pb@GaS and INT-Pb@GaS.…”

Production Methods of Van der Waals Heterostructures Based on Transition Metal Dichalcogenides

“…The heterostructures can be obtained after 15 min growth. Li et al [79] designed Au@MoS 2 core-shell heterostructures that were synthesized by direct growth of multilayer fullerene-like MoS 2 shell on Au nanoparticle cores (Figure 7c). During deposition, volatile MoO 3 and its partially decomposed suboxides react with sulfur vapor to form a MoS 2 shell on the Au nanoparticles.…”