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Anal Methods

Title:		Tetraphenylethene probe based fluorescent silica nanoparticles for the selective detection of nitroaromatic explosives
Author(s):		Nawaz MAH; Meng L; Zhou H; Ren J; Shahzad SA; Hayat A; Yu C;
Address:		"State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China. congyu@ciac.ac.cn"
Journal Title:		Anal Methods
Year:		2021
Volume:		20210127
Issue:		6
Page Number:		825 - 831
DOI:		10.1039/d0ay01945c
ISSN/ISBN:		1759-9679 (Electronic) 1759-9660 (Linking)
Abstract:		"A simple and sensitive fluorometric method is developed utilizing aggregation-induced emission probe based silica nanoparticles for the detection of nitroaromatic explosives. A positively charged tetraphenylethene based probe (TPE-C2-2+) is doped into silica nanoparticles exploiting electrostatic interactions to produce TPE-SiO(2) nanoparticles with a uniform particle size. The TPE-SiO(2) nanoparticles exhibit strong fluorescence emission due to the aggregation-induced emission (AIE) effect of the doped TPE probe. The fluorescence emission of TPE-SiO(2) offers quantitative and sensitive response to picric acid (PA), 2,4-dinitrotoluene (DNT) and 2,4,6-trinitrotoluene (TNT) which are used as model examples of nitroaromatic compounds. The fluorescence spectroscopy results show that the fluorescence emission of TPE-SiO(2) was greatly quenched in the presence of the electron-poor nitroaromatic compounds due to the inner filter effect (IFE) and possibly the contact quenching mechanism. TPE-SiO(2) nanoparticles show better sensitivity towards PA and could detect PA down to 0.01 muM with a linear detection range of 0.1-50 muM. The increased chemical stability, efficient high sensitivity and simple synthesis of the TPE-SiO(2) nanoparticles demonstrate that they can be used as an excellent fluorescent probe for a wide range of electron-poor compounds, i.e. nitroaromatic compounds. Interference studies show that common interfering species with nitroexplosives such as acids, bases, volatile organic compounds, and salt solutions have a negligible effect during the sensing process"
Keywords:
Notes:		"PubMed-not-MEDLINENawaz, Muhammad Azhar Hayat Meng, Lianjie Zhou, Huipeng Ren, Jia Shahzad, Sohail Anjum Hayat, Akhtar Yu, Cong eng Research Support, Non-U.S. Gov't England 2021/01/28 Anal Methods. 2021 Feb 14; 13(6):825-831. doi: 10.1039/d0ay01945c. Epub 2021 Jan 27"