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 MoS2 atomic layers. The heterostructures were synthesized by direct growth of multilayer fullerene-like MoS2 shell on Au nanoparticle cores. The Au@MoS2 heterostructures exhibit interesting light-matter interactions due to the structural curvature of MoS2 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 MoS2 shell. We also found potential evidence for the charge transfer-induced doping effect on the MoS2 shell. The DFT calculations further reveal that the structural curvature of MoS2 shell results in a modification of its electronic structure, which may facilitate the charge transfer from MoS2 to Au. Such Au@MoS2 core-shell heterostructures have the potential for future optoelectronic devices, optical imaging, and other energy-environmental applications.
Original language | English (US) |
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Pages (from-to) | 7696-7702 |
Number of pages | 7 |
Journal | Nano letters |
Volume | 16 |
Issue number | 12 |
DOIs | |
State | Published - Dec 14 2016 |
Funding
This material is based upon work supported by the National Science Foundation under Grant No. DMR-1507810. SH and CW (DFT calculations) acknowledge support by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Grant No. DEFG02-07ER46433. This work made use of the Keck-II facility of the NUANCE Center at Northwestern University, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF NNCI-1542205); the MRSEC program (NSF DMR-1121262).
Keywords
- Au@MoS core-shell heterostructures
- CVD
- Raman enhancement
- patterning
- photoluminescence
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Mechanical Engineering
- Bioengineering
- General Materials Science