Free-standing bimetallic nanorings and nanoring arrays made by on-wire lithography.
This paper describes a new strategy for synthesizing free-standing bimetallic nanorings and nanoring arrays based upon on-wire lithography and a galvanic replacement reaction. The strategy allows one to tune the diameter, length, and therefore aspect ratio of the nanorings. In addition, it can be used to produce arrays of nanorings in high yield with control over number and spacing. Spectroscopic studies and discrete dipole approximation calculations show that nanoring dimers exhibit greater surface enhanced Raman scattering than the analogous nanodisk dimers.
Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA.
Cipto
C
Liusman
Shuzhou
S
Li
Xiaodong
X
Chen
Wei
W
Wei
Hua
H
Zhang
George C
GC
Schatz
Freddy
F
Boey
Chad A
CA
Mirkin
D000497:Alloys / Q000737:chemistry*; D019281:Dimerization; D006046:Gold / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D053770:Nanowires / Q000737:chemistry*; D011327:Printing / Q000295:instrumentation*; D012834:Silver / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman
D000497:Alloys; D012834:Silver; D006046:Gold