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2018 ; 122
(8
): 4615-4621
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Spatially Resolved Sensitivity of Single-Particle Plasmon Sensors
#MMPMID29520315
Beuwer MA
; van Hoof B
; Zijlstra P
J Phys Chem C Nanomater Interfaces
2018[Mar]; 122
(8
): 4615-4621
PMID29520315
show ga
The high sensitivity of localized surface plasmon resonance sensors to the local
refractive index allows for the detection of single-molecule binding events.
Though binding events of single objects can be detected by their induced plasmon
shift, the broad distribution of observed shifts remains poorly understood. Here,
we perform a single-particle study wherein single nanospheres bind to a gold
nanorod, and relate the observed plasmon shift to the binding location using
correlative microscopy. To achieve this we combine atomic force microscopy to
determine the binding location, and single-particle spectroscopy to determine the
corresponding plasmon shift. As expected, we find a larger plasmon shift for
nanospheres binding at the tip of a rod compared to its sides, in good agreement
with numerical calculations. However, we also find a broad distribution of shifts
even for spheres that were bound at a similar location to the nanorod. Our
correlative approach allows us to disentangle effects of nanoparticle dimensions
and binding location, and by comparison to numerical calculations we find that
the biggest contributor to this observed spread is the dispersion in nanosphere
diameter. These experiments provide insight into the spatial sensitivity and
signal-heterogeneity of single-particle plasmon sensors and provides a framework
for signal interpretation in sensing applications.