Journal
ACS NANO
Volume 4, Issue 9, Pages 5446-5452Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn101231u
Keywords
encoding; tagging; surface-enhanced Raman scattering; SERS; on-wire lithography; biodetection
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Funding
- DoD
- AFOSR
- National Science Foundation (NSF) MRSEC
- Northwestern University
- NSF
- DARPA
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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.
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