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• W2326379220 abstract "Fluorescence indicator/layered double hydroxide (LDH) ultrathin films (UTFs) have been fabricated by alternate assembly of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) and Zn–Al LDH nanosheets on quartz substrates using the layer-by-layer (LBL) deposition technique and demonstrated to be good fluorescence chemosensors for Cd2+. The stepwise and regular growth of the ABTS/LDH UTFs with increasing deposition cycle was monitored by UV–vis absorption and fluorescence emission spectroscopy; a periodic layered structure perpendicular to the substrates with a thickness of 2.40–2.58 nm per bilayer was observed by X-ray diffraction, atomic force microscopy, and scanning electron microscopy. The fluorescence anisotropy of the UTFs was also observed by the polarization fluorescence technique. In addition, a fluorescence chemosensory UTF (20 bilayers) for Cd2+ exhibited a low detection limit (9.5 nM), good repeatability (relative standard deviation less than 3% in 20 consecutive measurements), high photostability and storage stability (with ∼94.1% of the initial fluorescence intensity remaining after 1 month), and excellent selectivity toward Cd2+ from Zn2+ in the physiological pH range (6.5–7.5). The regeneration of the fluorescence chemosensor can be achieved by the use of ethylenediamine tetraacetic acid (EDTA). The mechanism is based on the competitive complexation of Cd2+ between EDTA in solution and ABTS in the UTF, as confirmed by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and fluorescence anisotropy measurements. Therefore, this work provides a facile approach for the fabrication of chemosensors based on the incorporation of a fluorescence indicator into an inorganic two-dimensional matrix that can potentially be applied for the detection and measurement of Cd2+." @default.
• W2326379220 created "2016-06-24" @default.
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• W2326379220 date "2011-09-30" @default.
• W2326379220 modified "2023-10-14" @default.
• W2326379220 title "Fluorescence Chemosensory Ultrathin Films for Cd²⁺ Based on the Assembly of Benzothiazole and Layered Double Hydroxide" @default.
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• W2326379220 doi "https://doi.org/10.1021/jp2063035" @default.
• W2326379220 hasPublicationYear "2011" @default.
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