Journal
ACS APPLIED NANO MATERIALS
Volume 3, Issue 7, Pages 6584-6597Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c01045
Keywords
surface-enhanced Raman scattering; localized surface plasmon resonance; in-solution analysis; silver nanoparticles; rapid analysis; cellulose nanofibers
Funding
- Alberta Innovates via an Alberta Bio Future CNC Challenge 3.0 grant
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Canada Foundation for Innovation (CFI) CFI [27200]
- Department of Chemistry
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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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