Abstract
Based on hydrogen peroxide (H2O2)-modified bacterial nanocelluloses (BNCs(M)), we report in-situ overgrowth of highly dense plasmonic Au nanoparticles (NPs) on these filamentous three-dimensional (3D) supports by an ingenious “green” photochemical strategy. The measured relative atomic ratio of Au element in the resultant BNCs(M)@Au NPs is ∼ 13 times higher than that formed on pristine BNCs. The BNCs(M)@Au NPs exhibit a higher surface-enhanced Raman scattering spectroscopy (SERS) activity than the reference BNCs@Au NPs. The flexible SERS biosensors enable the label-free detection limit of glucose molecules to be achieved as low as 10−10 M, surpassing many reports in previous works and then facilitating the ultrasensitive evaluation of glucose metallic diseases.
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