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Supramolecular Self-Assembly Bioinspired Synthesis of Luminescent Gold Nanocluster-Embedded Peptide Nanofibers for Temperature Sensing and Cellular Imaging.
Bioconjugate Chemistry 2017 September 21
Metal nanoclusters (NCs) hold great potential as novel luminescent nanomaterials in many applications, while the synthesis of highly luminescent metal NCs still remains challenging. In this work, we report self-assembling peptides as a novel bioinspired scaffold capable of significantly enhancing the luminescence efficiency of gold nanoclusters (AuNCs). The resulting AuNCs capped with motif-designed peptides can self-assemble to form nanofiber structures, in which the luminescence of AuNCs is enhanced nearly 70-fold, with 21.3% quantum yield. The underlying mechanism responsible for the luminescence enhancement has been thoroughly investigated by the combined use of different spectroscopic and microscopic techniques. The resultant highly luminescent AuNC-decorated peptide nanofibers exhibit physicochemical properties that are advantageous for biological applications. As a proof of concept, we demonstrate the use of these nanostructure as fluorescent thermometers and for imaging living cells, both showing very promising results.
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