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Plasmonic Sensing via Photoluminescence of Individual Gold Nanorod
journal contribution
posted on 2016-02-20, 04:39 authored by Guowei Lu, Lei Hou, Tianyue Zhang, Jie Liu, Hongming Shen, Chunxiong Luo, Qihuang GongLabel-free plasmonic sensors based on localized surface
plasmon resonances of nanostructured noble metal materials usually
transduce optical refractive index changes occurring in the vicinity
of the nanostructures by optical scattering or by extinction. We demonstrate
in experiments that the photoluminescence of plasmonic nanoparticles
can also be employed to detect biological molecule binding events
efficiently. Photoluminescence probably due to plasmon emission of
a single gold nanorod presents a similar resonance peak and resembles
the response to a refractive index change observed by scattering.
The well-known biotin–streptavidin binding assay was detected
successfully using the photoluminescence of an individual isolated
nanorod. The localized surface plasmon resonances’ responses
by scattering in situ with the same nanorod and control
experiments were also performed to verify the sensing process. The
results evidence that a nanoscale plasmonic sensor can also be archived
effectively through the photoluminescence of a single plasmonic nanostructure.
Furthermore, key parameters to optimize the photoluminescence based
label-free plasmonic sensing are discussed in detail. The photoluminescence
provides an alternative way for label-free plasmonic sensing. And
it is believed that further exploration of this concept could lead
to a whole new class of efficient plasmonic sensors with diverse and
novel functionalities.
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index changecontrol experimentsphotoluminescencegold nanorodplasmonic nanoparticlesalternative wayplasmonic nanostructureplasmon emissionnovel functionalitiesmolecule binding eventsresults evidencemetal materialssurface plasmon resonancesindex changesplasmonic sensorsnanoscale plasmonic sensorresonance peak
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