Fluorescence 鈥淭urn On鈥?Detection of Mercuric Ion Based on Bis(dithiocarbamato)copper(II) Complex Functionalized Carbon Nanodots

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• 作者：Chao Yuan ; Bianhua Liu ; Fei Liu ; Ming-Yong Han ; Zhongping Zhang
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：January 21, 2014
• 年：2014
• 卷：86
• 期：2
• 页码：1123-1130
• 全文大小：411K
• ISSN：1520-6882

文摘

A new 鈥渢urn on鈥?fluorescence nanosensor for selective Hg²⁺ determination is reported based on bis(dithiocarbamato)copper(II) functionalized carbon nanodots (CuDTC₂-CDs). The CuDTC₂ complex was conjugated to the prepared amine-coated CDs by the condensation of carbon disulfide onto the nitrogen atoms in the surface amine groups, followed by the coordination of copper(II) to the resulting dithiocarbamate groups (DTC) and finally by the additional coordination of ammonium N-(dithicarbaxy) sarcosine (DTCS) to form the CuDTC₂-complexing CDs. The CuDTC₂ complex at surface strongly quenched the bright-blue fluorescence of the CDs by a combination of electron transfer and energy transfer mechanism. Hg²⁺ could immediately switch on the fluorescence of the CuDTC₂-CDs by promptly displacing the Cu²⁺ in the CuDTC₂ complex and thus shutting down the energy transfer pathway, in which the sensitive limit for Hg²⁺ as low as 4 ppb was reached. Moreover, a paper-based sensor has been fabricated by printing the CuDTC₂-CDs probe ink on a piece of cellulose acetate paper using a commercial inkjet printer. The fluorescence 鈥渢urn on鈥?on the paper provided the most conveniently visual detection of aqueous Hg²⁺ ions by the observation with naked eye. The very simple and effective strategy reported here facilitates the development of portable and reliable fluorescence nanosensors for the determination of Hg²⁺ in real samples.