Multicolorful fluorescent-nanoprobe composed of Au nanocluster and carbon dots for colorimetric and fluorescent sensing Hg2+ and Cr6+

SENSORS AND ACTUATORS B-CHEMICAL

卷:262

Article

Yu, Liying¹  Zhang, Lingyu²  Ren, Guojuan¹  Li, Shuang¹  Zhu, Baoya¹  Chai, Fang¹  Qu, Fengyu¹  Wang, Chungang²  Su, Zhongmin² 

[1] Harbin Normal Univ, Coll Chem & Chem Engn, Coll Heilongjiang Prov, Lab Photochem Biomat & Energy Storage Mat, Harbin 150025, Heilongjiang, Peoples R China

[2] Northeast Normal Univ, Fac Chem, Changchun 130024, Jilin, Peoples R China

关键词: Multicolor-fluorescence;    Au nanoclusters;    Carbon dots;    Detection;    Mercury ion;    Chromium (VI);   

DOI  :  10.1016/j.snb.2018.01.192

来源: Elsevier

【 摘 要 】

In this article, we reported a dual emissive multicolorful fluorescent-nanoprobe which was composed of gold nanocluster (BSA-Au NCs) and carbon dots (CDs) with a certain proportion, i.e. Au NCs-CDs. The dual emissive Au NCs-CDs showed pink fluorescence under UV light, and the dual emission peaks at 625 nm and 444 nm were corresponded to the existence of Hg2+ and Cr6+ respectively. The fluorescence color transformed from pink to blue when in presence of Hg2+. The blue fluorescence emission of CDs selectively quenched by Cr6+, whereas the red fluorescence of BSA-Au NCs was stable against Cr6+, which can be treated as internal reference. The difference response of the two emissions to Hg2+ and Cr6+ resulted in a distinguished fluorescent color change, which can be noticed by the naked eyes clearly. When the Hg2+ and Cr6+ were exposed to the Au NCs-CDs simultaneously, the dual-emission of the Au NCs-CDs were all reduced and exhibited the complete quenching of the pink emission. The detection limits for Hg2+ and Cr6+ were 1.85 nM and 5.34 nM, respectively. Significantly, it was successfully applied to determine the existence of Hg2+ and Cr6+ in real samples, which offered the advantages of simplicity, environmentally friendly and cost saving efficiency. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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