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Cellulose Nanofiber Films with Gold Nanoparticles Electrostatically Adsorbed for Facile Surface-Enhanced Raman Scattering Detection
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Researchers created cellulose nanofiber films with electrostatically adsorbed gold nanoparticles for use as surface-enhanced Raman scattering substrates. The films demonstrated high sensitivity for detecting contaminants like methylene blue and microplastics at very low concentrations, with good signal reproducibility and storage stability over 30 days.
Cellulose nanofiber (CNF) holds great promise in applications such as surface-enhanced Raman scattering (SERS), catalysis, esthesia, and detection. This study aimed to build novel CNF-based SERS substrates through a facile synthetic method. Citrate-reduced gold nanoparticles (AuNPs) were adsorbed on the cationized CNF surface due to electrostatic interactions, and uniform AuNPs@(2,3-epoxypropyl trimethylammonium chloride)EPTMAC@CNF flexible SERS substrates were prepared by a simple vacuum-assisted filtration method. The probe molecule methylene blue was chosen to assess the performance of the CNF-based SERS substrate with a sensitivity up to 10-9 M, superior signal reproducibility (relative standard deviation (RSD) = 4.67%), and storage stability (more than 30 days). Tensile strength tests indicated that the CNF-based films had good mechanical properties. In addition, CNF-based substrates can easily capture and visually identify microplastics in water. These results demonstrate the potential application of the flexible, self-assembled AuNPs@EPTMAC@CNF flexible SERS substrate for prompt and sensitive detection of trace substances.
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Surface-enhanced Raman scattering substrates made from silver nanowires deposited on regenerated cellulose films achieved sensitive detection of nanoplastic particles including polystyrene and polymethylmethacrylate at concentrations in the nanogram-per-liter range, demonstrating a practical SERS platform for environmental nanoplastic monitoring.
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