Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11016387 | Sensors and Actuators B: Chemical | 2019 | 35 Pages |
Abstract
Herein, we observed that the simple one-pot green method synthesized fluorescent silk fibroin (SF) protected copper nanoclusters (CuNCs) possessing unique aggregation/assembly induced emission enhance (AIEE) characteristics with the assistance of sulfide ion in aqueous solution. The interaction of CuNCs with S2â was further investigated by fluorescence spectroscopy, UV-vis absorption spectroscopy, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy. It demonstrated that the S2â can induced the ultrasmall Cu nanoclusters of ca. 2.8ânm orderly assembled to large nanoparticles of uniform rod-like with the size (47â±â2)âÃâ(15â±â2) nm by transmission electron microscopy (TEM). And the fluorescence intensity of the dispersed CuNCs was increased with the increase of absolute quantum yield from 1.6% to 4.9%. More importantly, the assembly large Cu nanoparticles are also monodispersed in size and morphology, which provides a distinctive advantage for analytical applications. Based on this, SF@CuNCs can be developed into a practical nanosensor for “turn-on” luminescence detection for S2â with a highly sensitive and selectivity. The linear response with the S2â concentrations range from 5.0âμM to 110.0âμM and detection limit was 0.286âμM. We demonstrated this assembled nanostructure as a powerful analytical platform for S2â detection.
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Authors
Guomei Zhang, Ruru Wang, Lihong Shi, Caihong Zhang, Yan Zhang, Ying Zhou, Chuan Dong, Gao Li, Shaomin Shuang,