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A kind of preparation method of polydopamine nanosphere/cadmium sulfide quantum dot composite material

A technology of polydopamine nano-composite materials, applied in biochemical equipment and methods, chemical instruments and methods, luminescent materials, etc., to achieve good conductivity and good detectable photoelectron yield

Active Publication Date: 2022-03-15
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are no literature and patent reports on the use of benzoquinone-rich polydopamine spheres as the supporting matrix and L-cysteine-encapsulated cadmium sulfide quantum dots (L-Cys-CdS QDs) as the attachment material.

Method used

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  • A kind of preparation method of polydopamine nanosphere/cadmium sulfide quantum dot composite material
  • A kind of preparation method of polydopamine nanosphere/cadmium sulfide quantum dot composite material
  • A kind of preparation method of polydopamine nanosphere/cadmium sulfide quantum dot composite material

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Embodiment 1

[0033] (1) Preparation of L-cysteine-encapsulated cadmium sulfide quantum dots (CdS QDs): Cd(NO 3 ) 2 (10.0mmol L -1 ) and L-cysteine ​​(15.0mmol L -1 ) was thoroughly mixed by magnetic stirring, and after stirring for 30 minutes, NaOH (0.1mol L -1 ) to adjust the pH value of the solution to 6.5, and then Na 2 S (8.0mmol L -1 ) was slowly added in the mixed solution, and then the solution was transferred to a 50ml Teflon-lined stainless steel autoclave, and after 30 minutes of deoxygenation with nitrogen, the reaction mixture was sealed, heated and reacted at 80°C for 12 hours, and then used Wash with absolute ethanol 3 times, and finally redisperse in water, keep at 4°C for use;

[0034] (2) Preparation of quinone-rich polydopamine nanospheres (PDANS): 20 mg of dopamine (DA) was dissolved in 20 ml of Tris-HCl (10 mmol L -1 ,pH 8.5) and K 3 [Fe(CN) 6 ](10mmol L -1 ), the mixture was reacted at 50°C for 4 hours, then centrifuged at 12000rpm, and washed 3 times;

[0035]...

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Abstract

The invention discloses a preparation method of polydopamine nanosphere / cadmium sulfide quantum dot composite (PDANS / CdS). The present invention uses quinone-rich polydopamine nanospheres (Q-PDANS) as a supporting matrix to capture L-cysteine-encapsulated cadmium sulfide quantum dots (CdS QDs) through nucleophilic addition or Schiff base reaction, The polydopamine nanosphere / cadmium sulfide quantum dot composite material (PDANS / CdS) was prepared; the polydopamine nanosphere has a high loading capacity for the cadmium sulfide quantum dot; the composite material has a good detectable photoelectron yield; the Polydopamine nanospheres can also capture and immobilize protein molecules rich in amino groups, antibodies or DNA molecules, and then load cadmium sulfide quantum dots as photoelectric signal probes for immunosensors and DNA sensors.

Description

technical field [0001] The invention relates to the preparation of sensors, in particular to a preparation method of polydopamine nanosphere / cadmium sulfide quantum dot composite material (PDANS / CdS). Background technique [0002] Dopamine (DA) is a natural compound present in most animals and plants with good biocompatibility. It can obtain polydopamine with an aromatic structure composed of catechol groups by oxidative self-polymerization, which can be converted into benzoquinone groups, and then capture biomolecules or protein molecules by nucleophilic addition or Schiff base reaction. Amino groups to achieve the purpose of immobilizing target biomolecules on its surface. [0003] Cadmium sulfide quantum dots (CdS QDs) are a new type of semiconductor nanomaterials with good optoelectronic properties, and their diameters are about 2-10 nm. Their optical properties such as high quantum yield and photostability make them widely used in different fields. The optical proper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/56C12Q1/6825B82Y30/00B82Y20/00
CPCC09K11/025C09K11/565C12Q1/6825B82Y30/00B82Y20/00C12Q2563/107C12Q2563/155
Inventor 邓克勤王毫李春香
Owner HUNAN UNIV OF SCI & TECH