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A new turn-on fluorescence sensor based on xylenol orange (XO) functionalized CdSe/CdS quantum dots (QDs) is developed for the determination of lead ion. CdSe/CdS QDs were first modified by mercaptoacetic acid (MAA). The MAA-modified QDs were then capped with the natural biopolymer chitosan and the negatively charged XO. The XO-functionalized QDs were formed via the layer-by-layer self-assembly reaction...
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