Trace nitroaromatic explosive visual inspection quantum dot test paper and preparation method thereof

A technology of nitroaromatic explosives and quantum dots, which is applied in chemical instruments and methods, fluorescence/phosphorescence, luminescent materials, etc., can solve the problems of complicated design and preparation steps of fluorescence ratio probes, and achieves improved visualization selectivity and improved vision. poor effect

Active Publication Date: 2014-01-22
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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Problems solved by technology

However, the design and preparation steps of fluorescent ratiometric probes are compl

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  • Trace nitroaromatic explosive visual inspection quantum dot test paper and preparation method thereof
  • Trace nitroaromatic explosive visual inspection quantum dot test paper and preparation method thereof
  • Trace nitroaromatic explosive visual inspection quantum dot test paper and preparation method thereof

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Embodiment 1

[0038] The preparation method of CdTe quantum dots with different emission wavelengths comprises the following steps:

[0039] Step 1: Prepare different emission wavelengths of mercaptoethylamine-modified CdTe quantum dot fluorescent probe CA-CdTe: 0.3856g Cd(NO 3 ) 2 4H 2 O was added to 250mL of deoxygenated ultrapure water, followed by 0.1205g of mercaptoethylamine, and then 1M (M in this application is the abbreviation of mol / L) NaOH solution to adjust its pH value to 10.0 to form mercapto-containing compounds and cadmium ions mixed solution. 0.0555g Na 2 TeO 3 Added to the mixed solution, dissolved by ultrasonic vibration, added freshly prepared NaBH 4 The solution, after stirring for 20 minutes, was heated to reflux. By controlling the reflux time from 10 to 300 minutes, an aqueous solution of cadmium telluride quantum dots with green to red luminescent bands aminated on the surface can be obtained. The prepared quantum dot stock solution was irradiated under a 15W...

Embodiment 2

[0043] The preparation method of the quantum dot test paper for the visual detection of trace nitroaromatic explosives comprises the following steps:

[0044] Step 1: Prepare mercaptoethylamine-modified CdTe quantum dot fluorescent probe CA-CdTe: 0.3856gCd(NO 3 ) 2 4H 2 O was added to 250 mL of deoxygenated ultrapure water, followed by 0.1205 g of mercaptoethylamine, and the pH was adjusted to 10.0 with 1M NaOH solution to form a mixed solution containing mercapto compounds and cadmium ions. 0.0555g Na 2 TeO 3 Added to the mixed solution, dissolved by ultrasonic vibration, added freshly prepared NaBH 4 The solution, after stirring for 20 minutes, was heated to reflux. By controlling the reflux time to 300 minutes, an aqueous solution of cadmium telluride quantum dots with surface amination and emitting red fluorescence can be obtained. The prepared quantum dot stock solution was irradiated under a 15W ultraviolet lamp to increase the fluorescence quantum yield, and it wa...

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Abstract

The invention discloses a trace nitroaromatic explosive visual inspection quantum dot test paper and a preparation method thereof. The preparation method comprises three steps that: CdTe quantum dots modified by mercaptoethylamine are prepared; CdTe quantum dots wrapped by thioglycolic acid are prepared; and CA-CdTe quantum dot solution and TGA-CdTe quantum dot solution are mixed and loaded on the surface of a filter paper. According to the invention, amino-comprising mercaptoethylamine modified on the surface of CA-CdTe quantum dots are utilized. The electron-rich amino on the surface of CA-CdTe quantum dots serve as an electron donor, and a meisenheimer composite is formed through the acid-base ion pair effect between the electron donor and the electron-deficient aromatic nitro explosive. Based on a direct charge transfer principle, fluorescence of the CA-CdTe quantum dots is quenched, such that nitroaromatic explosive visual inspection is realized. The TGA-CdTe quantum dots serve as an internal reference, such that sensitivity of naked eyes upon slight color change is enhanced. According to the invention, the CA-CdTe quantum dots and TGA-CdTe quantum dots are synthesized through aqueous phase reflux reduction. The preparation method is simple, cost is low, and quantum dot yield is high.

Description

technical field [0001] The invention relates to a quantum dot test paper for visual detection of trace nitro aromatic explosives and a preparation method thereof. Background technique [0002] Nitro aromatic explosives are a kind of important environmental pollutants with high toxicity and refractory degradation, which seriously threaten the ecological balance, social stability and national security. For example, according to United Nations statistics, there are 120 million unexploded landmines in 60 countries around the world, especially the leakage of nitro aromatic explosives caused by unexploded landmines left over from World War II is constantly destroying the ecological safety of local geology and groundwater . At present, the analysis and detection of nitroaromatic explosives mainly use neutron activation, gas chromatography, mass spectrometry, ion mobility chromatography and other instrumental analysis techniques. Unfortunately, most of these methods require large-s...

Claims

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Application Information

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IPC IPC(8): C09K11/88G01N21/64
Inventor 田先清陈玲王新锋余堃王晓川
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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