title: Au@MoS2Core-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@MoS2, where the Au nanoparticle is snugly and contiguously encapsulated by few shells of MoS2atomic layers. The heterostructures were synthesized by direct growth of multilayer fullerene-like MoS2shell on Au nanoparticle cores. The Au@MoS2heterostructures exhibit interesting light-matter interactions due to the structural curvature of MoS2shell 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 MoS2shell. We also found potential evidence for the charge transfer-induced doping effect on the MoS2shell. The DFT calculations further reveal that the structural curvature of MoS2shell results in a modification of its electronic structure, which may facilitate the charge transfer from MoS2to Au. Such Au@MoS2core-shell heterostructures have the potential for future optoelectronic devices, optical imaging, and other energy-environmental applications.
authors: Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States.
authors: Yuan
authors: Y
authors: Li
authors: Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States.
authors: Jeffrey D
authors: JD
authors: Cain
authors: Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States.
authors: Eve D
authors: ED
authors: Hanson
authors: Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States.
authors: Akshay A
authors: AA
authors: Murthy
authors: Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States.
authors: Shiqiang
authors: S
authors: Hao
authors: Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States.
authors: Fengyuan
authors: F
authors: Shi
authors: Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States.
authors: Qianqian
authors: Q
authors: Li
authors: Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States.
authors: Chris
authors: C
authors: Wolverton
authors: Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States.
authors: Xinqi
authors: X
authors: Chen
authors: Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, and §International Institute for Nanotechnology (IIN), Northwestern University , Evanston, Illinois 60208, United States.
authors: Vinayak P
authors: VP
authors: Dravid
keywords: Au@MoS2 core−shell heterostructures; CVD; Raman enhancement; patterning; photoluminescence