Nanostar probes for tip-enhanced spectroscopy
SCIE
SCOPUS
- Title
- Nanostar probes for tip-enhanced spectroscopy
- Authors
- Kim, W; Kim, N; Park, JW; Kim, ZH
- Date Issued
- 2016-01
- Publisher
- ROYAL SOC CHEMISTRY
- Abstract
- To overcome the current limit of tip-enhanced spectroscopy that is based on metallic nano-probes, we developed a new scanning probe with a metallic nanostar, a nanoparticle with sharp spikes. A Au nanoparticle of 5 nm was first attached to the end of a tip through DNA-DNA hybridization and mechanical pick-up. The nanoparticle was converted to a nanostar with a core diameter of similar to 70 nm and spike lengths between 50 nm and 80 nm through the reduction of Au3+ with ascorbic acid in the presence of Ag+. Fabrication yields of such tips exceeded 60%, and more than 80% of such tips showed a mechanical durability sufficient for use in scanning microscopy. Effectiveness of the new probes for tip-enhanced Raman scattering (TERS) and tip-enhanced fluorescence (TEF) was confirmed. The probes exhibited the necessary enhancement for TEF, and the tip-on and tip-off ratios varied between 5 and 100. This large tip-to-tip variability may arise from the uncontrolled orientation of the apexes of the spike with respect to the sample surface, which calls for further fabrication improvement. The result overall supports a new fabrication approach for the probe that is effective for tip-enhanced spectroscopy.
- Keywords
- SINGLE-MOLECULE FLUORESCENCE; FIELD OPTICAL MICROSCOPY; ATOMIC-FORCE MICROSCOPY; RAMAN-SPECTROSCOPY; GOLD NANOPARTICLES; NANOSCALE; SCATTERING; LIGHT; LOCALIZATION; RESONANCE
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29864
- DOI
- 10.1039/C5NR06657C
- ISSN
- 2040-3364
- Article Type
- Article
- Citation
- NANOSCALE, vol. 8, no. 2, page. 987 - 994, 2016-01
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