Silver-based nanodisk codes

Matthew J. Banholzer, Kyle D. Osberg, Shuzhou Li, Bryan F. Mangelson, George C. Schatz, Chad A. Mirkin

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

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 languageEnglish
Pages (from-to)5446-5452
Number of pages7
JournalACS nano
Volume4
Issue number9
DOIs
Publication statusPublished - Sep 28 2010

Keywords

  • SERS
  • biodetection
  • encoding
  • on-wire lithography
  • surface-enhanced Raman scattering
  • tagging

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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