Carbon nanotube-CdTe/CdS nanocomposite and preparation method thereof

A technology of nanocomposite materials and carbon nanotubes, which is applied in the field of nanocomposite materials and its preparation, can solve the problems of carbon nanotubes that cannot find the terminal coil structure and limit research, and achieve high fluorescence intensity and fluorescence stability. Effect

Inactive Publication Date: 2014-10-29
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, carbon nanotubes are a kind of coil structure that is intertwined and cannot find a terminal, and is insoluble in water or organic solvents, which greatly limits its research in the field of biomedicine.

Method used

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  • Carbon nanotube-CdTe/CdS nanocomposite and preparation method thereof
  • Carbon nanotube-CdTe/CdS nanocomposite and preparation method thereof
  • Carbon nanotube-CdTe/CdS nanocomposite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of NaHTe solution: 0.75mmol NaBH 4 Add 0.375mmol Te powder to 12ml double-distilled water, react in an oil bath at 60°C for 30-60min, and pass the reaction solution through a 0.22μm filter to filter out the precipitate generated by the reaction to obtain a relatively pure NaHTe solution.

[0028] (2) MPA modified Cd 2+ Preparation of precursor solution: 0.25mmol CdCl 2 2.5H 2 O, 52μL (0.6mmol) MPA was dissolved in 200mL double-distilled water, and the pH was adjusted to 8.5 with 1M NaOH, and nitrogen gas was passed for 30min under stirring to obtain Cd modified by MPA stabilizer. 2+ Precursor.

[0029] (3) Preparation of CdTe quantum dots: get 4ml of newly prepared NaHTe and add it to the Cd obtained in step (2) 2+ In the precursor solution, nitrogen gas was refluxed at 100°C for 60 minutes to obtain a CdTe quantum dot solution, which was concentrated to 1 / 4 of the original volume, isopropanol was added dropwise and centrifuged to obtain a precipitat...

Embodiment 2

[0032] (1) Preparation of CdS coating solution: 0.25mmol CdCl 2 2.5H 2 O, 0.25mmol TAA and 1.2mmol MPA were dissolved in 200mL double-distilled water, the pH was adjusted to 8.5 with 1M NaOH, and the CdS coating solution was obtained by blowing nitrogen gas for 30min while stirring. where Cd in the CdS coating solution 2+ : Stabilizer: S 2- The molar concentration ratio is 1:4.8:1.

[0033] (2) Preparation of CdTe / CdS core-shell quantum dots: Add the CdTe obtained in Example 1 to the CdS cladding solution, and reflux nitrogen gas at 100°C for 120 minutes to obtain a CdTe / CdS core-shell quantum dot solution, which is then concentrated To 1 / 4 of the original volume, isopropanol was added dropwise and centrifuged to obtain a precipitate, which was redissolved in a certain volume of double-distilled water for later use.

[0034] (3) figure 1 A shows the transmission electron microscope picture of the obtained water-soluble CdTe / CdS core-shell quantum dots. It can be seen from ...

Embodiment 3

[0037] (1) Add 0.2 g of MWCNTs-COOH and 0.2 g of EDC·HCl into 20 mL of DMSO for 3 h of ultrasonic reaction to activate the carboxyl groups on the carbon nanotubes.

[0038] (2) Add 0.3 g of PEI to the above system, and ultrasonically react for 24 hours.

[0039] (3) PEI-MWCNTs can be obtained by removing unreacted impurities in the system by dialysis.

[0040] (4) figure 1 B and C are transmission electron microscope images of PEI-MWCNTs. From Figure B, it can be seen that the dispersion of carbon nanotubes in water can be improved after PEI is used to modify carbon nanotubes. It can be seen from Figure C that the surface of MWCNTs is evenly coated with a layer of PEI, indicating that PEI can be well connected to the surface of carbon nanotubes through covalent bonds.

[0041] (5) image 3 A is the infrared spectrum of PEI-MWCNTs. It can be seen from the figure that 2854 and 2917 are the characteristic absorption peaks of PEI -CH2-, and 1448 is the characteristic absorptio...

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Abstract

The invention relates to a carbon nanotube-CdTe/CdS nanocomposite and a preparation method thereof. The composite material is prepared by covalently loading CdTe/CdS core-shell quantum dots onto the surface of PEI-MWCNTs. The preparation method comprises the following steps of adding CdTe/CdS quantum dots with a core-shell structure and a crosslinking agent into double distilled water, carrying out ultrasonic treatment for 3 hours, then adding PEI-MWCNTs, carrying out ultrasonic reaction for 24 hours and dialyzing to obtain the carbon nanotube-CdTe/CdS nanocomposite MWCNTs-CdTe/CdS. MWCNTs-CdTe/CdS nanocomposite prepared by the method has a good dispersibility in the aqueous phase as well as a relatively high fluorescence intensity and fluorescence stability and can be used as the novel nanometer fluorescent probe in the fields of photoelectric and biological sensors, biological pharmacy and the like.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials and their preparation, in particular to a carbon nanotube-cadmium telluride / cadmium sulfide nanocomposite material and a preparation method thereof. Background technique [0002] As an important and representative nanomaterial, carbon nanotube (CNT) has been extensively applied in the field of nanomedicine in recent years. Generally, carbon nanotubes are coil structures that are intertwined with each other and cannot find a terminal, and are insoluble in water or organic solvents, which greatly limits their research in the field of biomedicine. Modification of carbon nanotubes by chemical methods can not only improve their dispersibility, but also introduce some active functional groups, thus endowing them with new properties, such as reducing toxicity and increasing biocompatibility. In addition to the broad application prospects of single carbon nanotubes, new fluorescent markers construc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02G01N21/64B82Y30/00B82Y40/00
Inventor 朱利民丁兆强聂华丽陶磊
Owner DONGHUA UNIV
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