Using Cu2+ ions as a detection material to verify the synthesis mechanism of Au nanoclusters mediated by wool keratin and silk fibroin resilience network

TEXTILE RESEARCH JOURNAL(2022)

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Abstract
Nanoclusters, with their ultrasmall sizes, have emerged as an indispensable tool in designing structural materials with a wide range of applications, but predicting the synthesis mechanism and structures remains challenging. This work delineates a synthesis mechanism of gold nanoclusters (AuNCs), which is realized by functionalizing a wool keratin (WK) and silk fibroin (SF) resilience network structure via self-assembly with controllable microstructure transformation. We synthesized such AuNCs by reducing the thiol groups of WK into WK@AuNCs and then entering the WF&SF resilience framework during the reconstruction, achieving WK@AuNCs/WK&SF with high fluorescence intensity for selective quenching of heavy metal Cu2+ ions. Further investigation indicated that alpha-helix and beta-crystallites resulted in a soft-hard molecular segment denoted as WK&SF resilience network, which held and separated the WK@AuNCs into the nanocages. Owing to the synergism of these features, WK@AuNCs/WK&SF displayed superior fluorescence performances compared with WK@AuNCs.
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Key words
Gold nanoclusters, soft-hard segment structure, synthesis mechanism, detection of Cu2+, fluorescence quenching
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