期刊
NANO LETTERS
卷 16, 期 12, 页码 7696-7702出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b03764
关键词
Au@MoS2 core-shell heterostructures; CVD; Raman enhancement; photoluminescence; patterning
类别
资金
- National Science Foundation [DMR-1507810]
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DEFG02-07ER46433]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF NNCI-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois through the IIN
- Department of Defense (DoD) through the National Defense Science and Engineering Fellowship (NDSEG) Program
- Ryan Fellowship
- Northwestern University International Institute for Nanotechnology
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1507810] Funding Source: National Science Foundation
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.
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