Abstract
We report a novel method for synthesizing silver-based nanodisk code (NDC) structures using on-wire lithography, where we employ milder synthetic and etching conditions than those used to synthesize the analogous gold structures. The silver structures exhibit stronger surface-enhanced Raman scattering signals than their Au counterparts at 633 and 532 nm excitation and, therefore, lead to lower limits of detection when used in the context of DNA-based detection assays. Finally, use of two enhancing nanostructured materials in one disk code dramatically increases the information storage density for encoding. For example, a disk code consisting of 5 gold disk pairs has 13 unique combinations of enhancing patterns, while one with 5 disk pairs that can be either gold or silver has 98.
Original language | English (US) |
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Pages (from-to) | 5446-5452 |
Number of pages | 7 |
Journal | ACS nano |
Volume | 4 |
Issue number | 9 |
DOIs | |
State | Published - Sep 28 2010 |
Keywords
- SERS
- biodetection
- encoding
- on-wire lithography
- surface-enhanced Raman scattering
- tagging
ASJC Scopus subject areas
- General Materials Science
- General Engineering
- General Physics and Astronomy