Plasmonic Cellulose Nanofibers as Water-Dispersible Surface-Enhanced Raman Scattering Substrates
2020
A water-dispersible
surface-enhanced Raman scattering (SERS) substrate
is developed to provide rapid and reproducible measurement of solution-borne
analytes. Cellulose nanomaterials are generally dispersible in water
and are known to act as a reducing agent and support for the synthesis
of metal nanoparticles. In this work, cellulose nanofibers (CNF) are
decorated with Ag nanoparticles to yield plasmonic cellulose nanofibers
(Ag-CNF). The chemical reduction of the Ag onto the CNF is explored
and characterized. Conditions are optimized in terms of the SERS intensity
of a probe species. A process is introduced to produce colloidally
stable bundles of the hybrid nanomaterial that contain closely spaced
Ag nanoparticles which serve as SERS hot spots. This water-dispersible
substrate offers high reproducibility and rapid analysis of analytes
that both chemisorb and physisorb to the Ag nanoparticles. Ag-CNF
are used to detect rhodamine 6G and malachite green within 2 min.
Malachite green is measured at a limit of detection of 80 pM.
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