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Preparation method and application of ratiometric fluorescence sensor based on carbon dots-quantum dots

A ratiometric fluorescence, quantum dot technology, applied in fluorescence/phosphorescence, instruments, measuring devices, etc., can solve the problems of public acceptance, complicated operation, expensive instruments, etc., and achieve broad application prospects, simple operation, and low detection limit.

Active Publication Date: 2020-08-07
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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Problems solved by technology

Traditional silver ion detection methods include atomic absorption spectrometry (AAS), X-ray spectrometry (XRF), inductively coupled plasma-atomic emission spectrometry (IEP-AES) and potentiometric titration, etc. Complicated, time-consuming and other disadvantages cannot be accepted by the broad masses of the people, and it is difficult to popularize
According to the existing literature methods, the new fluorescent sensor method based on carbon dots-quantum dots to quickly identify silver ions has not been reported in the literature. Therefore, it is necessary to establish a method with better stability, faster response, lower detection limit, and can be put into industrialization. Production of silver ion detection method

Method used

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  • Preparation method and application of ratiometric fluorescence sensor based on carbon dots-quantum dots
  • Preparation method and application of ratiometric fluorescence sensor based on carbon dots-quantum dots
  • Preparation method and application of ratiometric fluorescence sensor based on carbon dots-quantum dots

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Embodiment 1

[0029] Embodiment 1: the preparation method based on carbon dot-quantum dot nano-fluorescent sensor, the schematic diagram of the method is as follows figure 1 ,Proceed as follows:

[0030] (1) Synthesis of CdTe quantum dots coated with mercaptosuccinic acid:

[0031] Cadmium chloride 2.5 hydrate (0.1142g, 12.5mmol·L -1 , the concentration refers to the concentration of the substance dissolved in the solution, the same below) and mercaptosuccinic acid (0.0979g, 16.3mmol L -1 ) was dissolved in 40mL of ultrapure water, stirred at normal temperature and pressure for 15 minutes to fully dissolve it; the pH of the solution was adjusted to 8.00 with sodium hydroxide, then nitrogen gas was introduced and stirred in an ice bath for 20 minutes; sodium tellurite (0.0221 g, 2.5mmol·L -1 ), after stirring for 15 minutes, add an appropriate amount of sodium borohydride (0.0113g, 7.5mmol·L -1 ), continue to stir for 10 minutes; transfer the clear solution to a reaction kettle, put it i...

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Abstract

The invention belongs to the technical field of nano material preparation, and particularly relates to a preparation method and application of a ratiometric fluorescence sensor based on carbon dots and quantum dots. The nano fluorescence sensor with high sensitivity and high specificity to silver ions is obtained by mixing CdTe quantum dots wrapped by mercaptosuccinic acid and sulfur-doped carbondots according to a specific ratio. The ratiometric fluorescence sensor can be specifically combined with silver ions to generate a fluorescence quenching effect, and is better in stability, faster inresponse and lower in detection limit. The preparation method is simple in process, green, environment-friendly, low in cost and easy to popularize, can be put into industrial production, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method and application of a carbon dot-quantum dot ratio fluorescence sensor. Background technique [0002] Carbon dots, a carbon-based zero-dimensional material, have been widely used in chemical analysis, environmental monitoring, medical imaging, and energy development due to their outstanding optical properties, biocompatibility, low cost, low toxicity, and chemical inertness. field. At present, there are many synthesis methods of carbon dots, such as arc discharge method, laser ablation method and electrochemical synthesis method, etc., but the synthesis of carbon dots by hydrothermal method in the general laboratory has the advantages of simple operation, high repeatability, and environmental protection. Quantum dots are a new type of semiconductor nanomaterials, which have size effect, quantum confinement effect, macroscopic quan...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/6428G01N2021/6432
Inventor 付海燕王硕时琼陈亨业兰薇佘远斌
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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