title: High selectivity of colorimetric detection of p-nitrophenol based on Ag nanoclusters.
abstract: Ag nanoclusters (Ag NCs) templated by hyperbranched polyethyleneimine (PEI) with different terminal groups and molecular weights had been developed as a special optical sensor for detecting p-nitrophenol (p-NP). When adding p-NP into Ag NCs, an obvious color change from pale yellow to deep yellow could be observed by naked eyes, accompanying with an apparent red-shift of absorption peak, and the reason was attributed to the formation of oxygen anion of p-NP based on the transfer of H+from p-NP to amine groups of PEI. The molecular weights of template would greatly affect the sensitivity of p-NP. Ag NCs capped by PEI terminated ethylenediamine (EDA) possessed better sensitivity than other Ag NCs, showing good linear range from 5 to 140μM with the limit of detection as low as 1.28μM. Most importantly, this present system displayed high selectivity toward p-NP even in the presence of other nitrophenols and nitrotoluenes. This reliable method had been successfully applied for the detection of p-NP in real water and soil samples.
authors: The Key Laboratory of Life-Organic Analysis, Qufu Normal University, Qufu 273165, Shandong, China; Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu 273165, Shandong, China. Electronic address: qufei3323@163.com.
authors: Fei
authors: F
authors: Qu
authors: The Key Laboratory of Life-Organic Analysis, Qufu Normal University, Qufu 273165, Shandong, China; Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu 273165, Shandong, China.
authors: Ping
authors: P
authors: Chen
authors: The Key Laboratory of Life-Organic Analysis, Qufu Normal University, Qufu 273165, Shandong, China; Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu 273165, Shandong, China.
authors: Shuyun
authors: S
authors: Zhu
authors: The Key Laboratory of Life-Organic Analysis, Qufu Normal University, Qufu 273165, Shandong, China; Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu 273165, Shandong, China; Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China. Electronic address: jmyou6304@163.com.
authors: Jinmao
authors: J
authors: You
keywords: Ag nanoclusters; Colorimetric detection; P-nitrophenol; Polyethyleneimine