Journal
ACS NANO
Volume 4, Issue 12, Pages 7676-7682Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn102495f
Keywords
nanorings; nanoring arrays; on-wire lithography; galvanic replacement reaction; surface-enhanced Raman scattering
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Funding
- DoD
- NSF NSEC [EEC-0647560]
- DOE Office via NU Non-equilibrium Energy Research Center [DE-SC0000989]
- AFOSR
- EDB in Singapore
- NSEC
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This paper describes a new strategy for synthesizing free-standing bimetallic nanorings and nanoring arrays based upon on-wire lithography and a galvanic replacement reaction. The strategy allows one to tune the diameter, length, and therefore aspect ratio of the nanorings. In addition, it can be used to produce arrays of nanorings in high yield with control over number and spacing. Spectroscopic studies and discrete dipole approximation calculations show that nanoring dimers exhibit greater surface enhanced Raman scattering than the analogous nanodisk dimers.
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