Ultrahigh-Density Array of Silver Nanoclusters for SERS Substrate with High Sensitivity and Excellent Reproducibility
SCIE
SCOPUS
- Title
- Ultrahigh-Density Array of Silver Nanoclusters for SERS Substrate with High Sensitivity and Excellent Reproducibility
- Authors
- Won Jon Cho; Youngsuk Kim; Kim, JK
- Date Issued
- 2012-01
- Publisher
- ACS NANO
- Abstract
- We introduce a simple but robust method to fabricate an ultrahigh-density array of silver nanoclusters for a surface-enhanced Raman spectroscopy (SERS) substrate with high sensitivity and excellent reproducibility at a very large area (wafer scale) based on polystyrene-block-poly(4-vinylpyridine) copolymer (PS-b-P4VP) micelles. After silver nitrates were incorporated into the micelle cores (P4VP) followed by the reduction to silver nanoclusters, we systematically controlled the gap distance between two neighboring silver nanoclusters ranging from 8 to 61 nm, while the diameter of each silver nanocluster was kept nearly constant (similar to 25 nm). To make a silver nanocluster array with a gap distance of 8 nm, the use of crew-cut-type micelles is required. Fabricated SERS substrate with a gap distance of 8 nm showed very high signal intensity with a SERS enhancement factor as high as 10(8), which is enough to detect a single molecule, and excellent reproducibility (less than +/-5%) of the signal intensity. This is because of the uniform size and gap distance of silver nanoclusters in a large area. The substrate could also be used for label-free immunoassays, biosensing, and nanoscale optical antennas and light sources.
- Keywords
- SERS; silver nanoclusters array; biosensing; high sensitivity and excellent reproducibility; block copolymer micelles; ENHANCED RAMAN-SCATTERING; SINGLE-MOLECULE SERS; BLOCK-COPOLYMERS; CLUSTER ARRAYS; IN-VIVO; NANOPARTICLE; SPECTROSCOPY; NANOSTRUCTURES; TRANSMISSION; PLASMONICS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/16632
- DOI
- 10.1021/NN2035236
- ISSN
- 1936-0851
- Article Type
- Article
- Citation
- ACS NANO, vol. 6, no. 1, page. 249 - 255, 2012-01
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- There are no files associated with this item.
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