期刊
NANOSCALE
卷 9, 期 16, 页码 5263-5272出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr09896g
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资金
- National Science Foundation [0925445]
- NSF-EPSCoR-RII award
- University of Alabama's Office of sponsored programs and Research Grant Committee Award
Heterostructures of one-dimensional nanowire supported graphene/plasmonic nanoparticles are promising for future SERS-based chemical sensors. In this paper, we report a novel heterostructured SERS substrate composed of free-standing Si nanowires and surface-decorating Au/graphene nanoparticles. We successfully developed a unique CVD approach for the cost-effective and large-scale growth of freestanding Si nanowires. Au nanoparticles were decorated on the Si nanowires using a galvanic deposition -an annealing approach. This was followed by the selective growth of a multilayer graphene shell on the Au nanoparticles via a xylene-based CVD approach. Discrete dipole approximation simulation was used to understand the plasmonic properties of these Si nanowire-based heterostructures. The results indicate that the incorporation of Au nanoparticles and graphene on Si nanowires has a significant influence on their light absorption and scattering properties. Meanwhile, a strong surface plasmon coupling was observed at the interface regions of different materials (e. g., Si/Au, Au/graphene), introducing multiple coenhanced hot spots on the heterostructures. We found that our new heterostructures have a combined effect of an electromagnetic mechanism and a chemical mechanism for SERS and demonstrate an enhancement factor of 10(6)-10(7).
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