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Sensing Characteristics of NIR Localized Surface Plasmon Resonances in Gold Nanorings for Application as Ultrasensitive Biosensors
Abstract
The optical responses of 75-150 nm diameter gold nanorings to changes in local refractive index have been quantified by near-infrared extinction spectroscopy and compared to DDA calculations and an analytical approach. The "bulk" refractive index sensitivities of gold nanorings are substantially (>5 times) larger than those of nanodisks with similar diameters. Nanorings retain a significantly larger sensitivity than nanodisks at the same spectral position, demonstrating a clear shape dependence that may correlate to a systematic difference in the influence of the dielectric substrate. The nanoring bulk refractive index sensitivity scales linearly with plasmon peak position. The spectral sensitivity to thin films of alkanethiols gave a shift of approximately 5.2 nm/CH2 unit while bulk sensitivities as high as 880 nm/RIU were observed, the highest such reported sensitivities. Both bulk and thin dielectric film sensitivities correlated well with theory. Real-time label-free monitoring of protein binding via molecular recognition was demonstrated.
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Metadata
- Authors
- Larsson, E. M., Alegret, J., Käll, M., & Sutherland, D. S.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2007-04-13
- Volume
- 7
- Issue
- 5
- Pages
- 1256-1263
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2027341576
- Cited by
- 699
- References
- 25
- FWCI
- 24.36
- Type
- journal article
- Language
- en
- Open access
- closed
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