Approaching Sensitivity of Tens of Ions Using Atomically Precise Cluster鈥揘anofiber Composites

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• 作者：Atanu Ghosh ; Vedhakkani Jeseentharani ; Mohd Azhardin Ganayee ; Rani Gopalakrishnan Hemalatha ; Kamalesh Chaudhari ; Cherianath Vijayan ; Thalappil Pradeep
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：November 18, 2014
• 年：2014
• 卷：86
• 期：22
• 页码：10996-11001
• 全文大小：367K
• ISSN：1520-6882

文摘

A new methodology has been demonstrated for ultratrace detection of Hg²⁺, working at the limit of a few tens of metal ions. Bright, red luminescent atomically precise gold clusters, Au@BSA (BSA, bovine serum albumin), coated on Nylon-6 nanofibers were used for these measurements. A green emitting fluorophore, FITC (fluorescein isothiocyanate), whose luminescence is insensitive to Hg²⁺ was precoated on the fiber. Exposure to mercury quenched the red emission completely, and the green emission of the fiber appeared which was observed under dark field fluorescence microscopy. For the sensing experiment at the limit of sensitivity, we have used individual nanofibers. Quenching due to Hg²⁺ ions was fast and uniform. Adaptation of such sensors to pH paper-like test-strips would make affordable water quality sensors at ultralow concentrations a reality.