Self-organized bimetallic Ag-Co nanoparticles with tunable localized surface plasmons showing high environmental stability and sensitivity.
We demonstrate a promising synthesis route based on pulsed laser dewetting of bilayer films (Ag and Co) to make bimetallic nanoparticle arrays. By combining experiment and theory we establish a parameter space for the independent control of composition and diameter for the bimetallic nanoparticles. As a result, physical properties, such as the localized surface plasmon resonance (LSPR), that depend on particle size and composition can be readily tuned over a wavelength range one order of magnitude greater than for pure Ag nanoparticles. The LSPR detection sensitivity of the bimetallic nanoparticles with narrow size distribution was found to be high-comparable with pure Ag (∼60 nm/RIU). Moreover, they showed significantly higher long-term environmental stability over pure Ag.
Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA.
R
R
Sachan
S
S
Yadavali
N
N
Shirato
H
H
Krishna
V
V
Ramos
G
G
Duscher
S J
SJ
Pennycook
A K
AK
Gangopadhyay
H
H
Garcia
R
R
Kalyanaraman
D000497:Alloys / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D017753:Ecosystem; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods*
D000497:Alloys; D003035:Cobalt; D012834:Silver