Gold Nanoclusters Templated by Poly-cytosine DNA as Fluorescent Probes for Selective and Sensitive Detection of Thiocyanate

• 来源期刊: 高等学校化学研究（英文版）
• 年，卷（期）: 2019,（5）
• 页码范围: 788-791
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s40242-019-8361-9

摘要

Gold nanoclusters(AuNCs) were prepared in the presence of the nucleobases of poly-cytosine DNAs in this paper.We have demonstrated that the fluorescence of the AuNCs is quenched by thiocyanate(SCN) through the interaction between SCN-and gold atoms.AuNCs can receive energy from nucleobases to boost their emission intensity,while in the presence of SCN-,they coordinate with Au atoms and influence the energy transfer between the nucleobases and AuNCs,leading to the fluorescence quenching.The decreased fluorescence intensity was in proportion to the concentration of SCN-in the range of 8.0× 10-7-1.5× 10-5 mol/L with a limit of detection of 4.2× 10-7 mol/L(3 σ).We further validated the practice of this probe through the detection of SCN-in natural water samples.