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Sensor, preparation method and application thereof, and detection method of 2, 4, 6-trinitrophenol

A technology of trinitrophenol and a detection method, applied in the field of sensors, can solve the problems of low fluorescence efficiency, non-luminescence, low luminescence intensity, etc., and achieve the effects of simple process, low production cost and enhanced fluorescence intensity

Inactive Publication Date: 2020-01-14
北威(重庆)科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The label-free sensor based on the fluorescence quenching effect of TNP on molybdenum disulfide quantum dots can selectively detect TNP, but the sensor still encounters some problems in the process of detecting TNP: one, using non-pulsed light (such as ultraviolet lamp) As a light source to excite molybdenum disulfide quantum dots to emit light, when the wavelength is greater than 500nm, its luminous intensity is extremely low or even does not emit light
Third, the fluorescence efficiency of molybdenum disulfide quantum dots is low, which seriously affects the detection sensitivity

Method used

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  • Sensor, preparation method and application thereof, and detection method of 2, 4, 6-trinitrophenol
  • Sensor, preparation method and application thereof, and detection method of 2, 4, 6-trinitrophenol
  • Sensor, preparation method and application thereof, and detection method of 2, 4, 6-trinitrophenol

Examples

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preparation example Construction

[0069] In a second aspect, in at least one embodiment, a method for preparing the above-mentioned sensor is provided, comprising the following steps:

[0070] (a) adding the dispersion of nano metal rods to the surface of the substrate dropwise, and drying to obtain a substrate with a self-assembled nano metal rod array, the nano metal rod array is vertically self-assembled on the surface of the substrate;

[0071] (b) immersing the substrate obtained in step (a) in the molybdenum disulfide quantum dot dispersion, and after stirring, the molybdenum disulfide quantum dots are loaded on the nano metal rods to obtain the sensor;

[0072] Alternatively, the molybdenum disulfide quantum dot dispersion liquid is spin-coated on the substrate obtained in the step (a), and the molybdenum disulfide quantum dots are supported on nano metal rods to obtain the sensor.

[0073] The preparation method has simple process, low production cost, and is suitable for mass production. The prepared ...

Embodiment 1

[0095] a sensor such as figure 1 As shown, it includes a substrate 1, an array of nano-gold rods 2 vertically distributed on the surface of the substrate, and molybdenum disulfide quantum dots 3 supported on the tips of the nano-gold rods; wherein, the length of the prepared nano-gold rods is less than 10 nm, and the absorption peak is located at 920 nm. The distance between the gold rods is not more than 1nm, the resonance peak of the nano gold rod array is located at 650-750nm, and the molybdenum disulfide quantum dot has a single-layer structure with an average diameter of 3nm.

[0096] The preparation method of the sensor comprises the following steps:

[0097] (a) The preparation of nano-gold dispersion liquid adopts "seed crystal method", including: chloroauric acid (25mM, 100μL), freshly prepared iced sodium borohydride (10mM, 600μL), hexadecyltrimethyl Ammonium bromide (CTAC) (0.2M, 5mL) was added into a 20mL beaker and kept for 0.5h to obtain a brown gold nano single...

Embodiment 2

[0106] A sensor comprising a substrate, an array of gold nanorods vertically distributed on the surface of the substrate, and molybdenum disulfide quantum dots loaded on the tips of the gold nanorods; wherein, the length of the gold nanorods prepared is less than 8nm, and the absorption peak is located at 920nm. The distance between them is not more than 1nm, the resonance peak of the nano-gold rod array is located at 650-750nm, and the molybdenum disulfide quantum dot has a single-layer structure with an average diameter of 2nm.

[0107] The difference between the preparation method of this sensor and Example 1 is that the concentration of chloroauric acid in Example 1 is replaced by 20 mM, and the treatment time of molybdenum disulfide powder in the ultrasonic cleaning machine is replaced by 1 hour.

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Abstract

The invention relates to a sensor, a preparation method and an application thereof, and a detection method of 2, 4, 6-trinitrophenol. The sensor comprises a substrate, a nano metal rod array vertically distributed on the surface of the substrate and molybdenum disulfide quantum dots loaded on nano metal rods, wherein the interval between every two adjacent nano metal bars does not exceed 1 nm, andthe average diameter of the molybdenum disulfide quantum dots is 2-4 nm. The sensor can emit green fluorescence with relatively high intensity, is high in human eye distinguishable degree, has wide universality and high efficiency, is high in fluorescence efficiency, can specifically recognize TNP, obviously quenches a fluorescence signal of to-be-detected TNP after the to-be-detected TNP is captured, is high in detection sensitivity, and can be used for detecting trace TNP.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a sensor, a preparation method and application thereof, and a detection method of 2,4,6-trinitrophenol. Background technique [0002] 2,4,6-Trinitrophenol (TNP) is an important nitroaromatic explosive, which has stronger explosive power than the famous trinitrotoluene (TNT), and has been widely used in forensic research, mine areas such as detection and rocket fuel manufacturing. 2,4,6-Trinitrophenol is considered an environmentally hazardous substance and has long-lasting adverse health effects on humans and wildlife. Therefore, the research on TNP detection methods has made great progress in recent years, but because the structures and properties of TNP and TNT are very similar, many methods for detecting TNP are often interfered by TNT. Therefore, a higher requirement is put forward for the selective detection of TNP. [0003] The label-free sensor based on the fluorescence quenching...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6402
Inventor 刘勇江张欣
Owner 北威(重庆)科技股份有限公司
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