期刊
NANO LETTERS
卷 12, 期 7, 页码 3828-3832出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl301793k
关键词
On-wire lithography; surface-enhanced Raman scattering; nanoparticle arrays; gold nanorods; plasmonic dimers
类别
资金
- NSSEF from the Department of Defense [N00244-09-1-0012]
- DARPA
- Air Force Office of Scientific Research [FA9550-09-1-0294]
- NSF MRSEC [DMR-1121262]
- Northwestern University
- National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1121262] Funding Source: National Science Foundation
We report the synthesis of solution-dispersible, 35 nm diameter gold nanorod dimers with gaps as small as similar to 2 nm for surface-enhanced Raman scattering (SERS). Using on-wire lithography (OWL), we prepared tailorable dimers in high yield and high monodispersity (similar to 96% dimers) that produce both large and reproducible SERS signals with enhancement factors of (6.8 +/- 0.7) x 10(8) for single dimers in air and 1.2 x 10(6) for ensemble-averaged solution measurements. Furthermore, vie show that these structures, which are the smallest ever made by OWL, can be used to detect molecules on flat surfaces and in aqueous solutions. When combined, these attributes with respect to sensitivity, reproducibility, and tailorability lead to a novel and powerful local amplification system for SERS applications.
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