Silver-based nanodisk codes.
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.
Banholzer
Matthew J
MJ
Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA.
Osberg
Kyle D
KD
Li
Shuzhou
S
Mangelson
Bryan F
BF
Schatz
George C
GC
Mirkin
Chad A
CA
D001483:Base Sequence; D004277:DNA, Single-Stranded / Q000032:analysis / Q000235:genetics; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D055620:Optical Phenomena; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman
D004277:DNA, Single-Stranded; D012834:Silver