Detection method of picric acid by "pill-shaped" fluorescent film

Abstract

The invention discloses a method for detecting picric acid by using a pill-like fluorescent film. The method comprises the following steps: step 1, preparing a P(VDF-HFP) solution and a chloroform solution of TPE-2pTPA and mixing the two solutions to prepare a TPE-2pTPA / P(VDF-HFP) solution; step 2, placing the TPE-2pTPA / P(VDF-HFP) solution in a low temperature environment in a refrigerator for 7 d; step 3, subjecting the treated TPE-2pTPA / P(VDF-HFP) solution to spin coating so as to prepare a pill-like TPE-2pTPA / P(VDF-HFP) spin-coated film; and step 4, gradually adding PA solutions with different concentrations into the pill-like TPE-2pTPA / P(VDF-HFP) spin-coated film drop by drop for detection. The method is simple to operate, low in cost, high in sensitivity, fast in response speed and easy for development of corresponding devices, and has the unique advantages of safety, no toxicity, no pollution to the environment, affordability, etc.

Description

technical field [0001] The invention relates to the fields of explosive detection technology and electrospinning technology, in particular to a method for detecting picric acid by a "pill-shaped" fluorescent film. Background technique [0002] Explosives bring huge hidden dangers to the environment and human beings, and the main components of explosives are nitroaromatic compounds. 2,4,6-Trinitrophenol (commonly known as picric acid, PA) is a typical nitroaromatic compound, and its detection is closely related to military operations, national defense security, environmental monitoring, and daily life ( Sandhu S, Kumar R, Singh P, et al. Ultratrace Detection of Nitroaromatics: Picric Acid ResponsiveAggregation / Disaggregation of Self-Assembled p-Terphenylbenzimidazolium-Based Molecular Baskets[J].ACS Applied Materials&Interfaces,2015,7(19):105001- .). The detection method of picric acid mainly contains gas chromatography (Godejohann M, Preiss A, Levsen K, et al. Determinatio...

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Problems solved by technology

To prepare solid-state fluorescent thin film sensors, spin coating is the most commonly used method (Chen Y, Shao Y, Fan L. Fluorescent Color Tuning of Conjugated Polymer Materials: Mechanisms and Methods[J].Progress in Chemistry,2014,26(11):1801- 1810.), and the aggregation of fluorescent active substances caused by spin coating leads to defects such as fluorescence self-quenching, fluorescence leakage, low permeability of analytes, and slow response speed, which seriously affect the sensing performance of the film (Peng J, Sun J, Gong P, etal. Luminescent Nanofibers Fabricated from Phenanthroimidazole Derivatives by Organogelation: Fluorescence Response towards Acid with High Performance [J]. Chemistry-an Asian Journal, 2015,10(8):1717-1724.)

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