期刊
ANALYTICAL METHODS
卷 13, 期 6, 页码 825-831出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ay01945c
关键词
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资金
- National Natural Science Foundation of China [51761145102, 21874128]
- Science and Technology Development Foundation of Jilin Province [20190201069JC]
- Pakistan Science Foundation [PSF/NSFC-II/Eng/KP-COMSATS-Abt(12)]
A fluorometric method utilizing aggregation-induced emission probe based silica nanoparticles was developed for the detection of nitroaromatic explosives, showing that TPE-SiO2 nanoparticles exhibit better sensitivity towards picric acid. The study demonstrates that the TPE-SiO2 nanoparticles can be used as an excellent fluorescent probe for a wide range of electron-poor compounds, i.e. nitroaromatic compounds.
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-SiO2 nanoparticles with a uniform particle size. The TPE-SiO2 nanoparticles exhibit strong fluorescence emission due to the aggregation-induced emission (AIE) effect of the doped TPE probe. The fluorescence emission of TPE-SiO2 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-SiO2 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-SiO2 nanoparticles show better sensitivity towards PA and could detect PA down to 0.01 mu M with a linear detection range of 0.1-50 mu M. The increased chemical stability, efficient high sensitivity and simple synthesis of the TPE-SiO2 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.
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