Graphene oxide-cadmium telluride/cadmium sulfide nano composite material and preparation method thereof

A nanocomposite material and composite material technology, applied in the field of graphene oxide-cadmium telluride/cadmium sulfide nanocomposite material and its preparation, can solve problems such as poor stability and limited research, and achieve high fluorescence intensity and high fluorescence stability sexual effect

Inactive Publication Date: 2014-12-17
DONGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the poor stability of graphene oxide in the aqueous phase, ...

Method used

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  • Graphene oxide-cadmium telluride/cadmium sulfide nano composite material and preparation method thereof
  • Graphene oxide-cadmium telluride/cadmium sulfide nano composite material and preparation method thereof
  • Graphene oxide-cadmium telluride/cadmium sulfide nano composite material and preparation method thereof

Examples

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Embodiment 1

[0028] (1) Preparation of NaHTe solution: add 0.75mmol NaBH 4 Add 0.375mmol Te powder to 12ml of double-distilled water, and react in an oil bath at 60°C for 30-60min. The resulting solution is filtered through a 0.22μm filter membrane to filter out the precipitate produced by the reaction to obtain a pure NaHTe solution.

[0029] (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 was blown for 30min under stirring to obtain MPA stabilizer modified Cd 2+ Precursor fluid.

[0030] (3) Preparation of CdTe quantum dots: Take 4ml of newly prepared NaHTe and add it to the Cd obtained in step (2) 2+ In the precursor solution, the CdTe quantum dot solution was obtained by refluxing with nitrogen at 100°C for 60 minutes. The solution was concentrated to 1 / 4 of the original volume. Isopropanol was added dropwise and centrifuged to obtain...

Embodiment 2

[0032] (1) Preparation of CdS cladding solution: add 0.25mmol CdCl 2 ·2.5H 2 O, 0.25mmol TAA and 1.2mmol MPA were dissolved in 200mL of double-distilled water, adjusted to pH 8.5 with 1M NaOH, and stirred with nitrogen for 30min to obtain a CdS cladding solution. Among them, Cd in CdS cladding 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 with nitrogen at 100°C for 120 minutes to obtain a CdTe / CdS core-shell quantum dot solution, and concentrate it To 1 / 4 of the original volume, add isopropanol dropwise and centrifuge to obtain a precipitate, and re-dissolve the obtained precipitate in a certain volume of double-distilled water for later use.

[0034] (3) figure 1 (a) shows the TEM picture of the obtained water-soluble CdTe / CdS core-shell quantum dots. It can be seen from the figure that the quantum dots are uniform in...

Embodiment 3

[0037] (1) 0.2g of GO and 0.2g of EDC·HCl were added to 20mL of DMSO for 3h ultrasonic reaction to activate the carboxyl groups on the graphene oxide.

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

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

[0040] (4) figure 1 (b) is a transmission electron microscope picture of PEI-GO. From the picture (b), it can be seen that the surface of GO is evenly coated with a layer of PEI, indicating that PEI can be well connected to the surface of graphene oxide through covalent bonds.

[0041] (5) image 3 -a is the infrared spectrum of PEI-GO. It can be seen from the figure that 2854 and 2917 are PEI-CH 2 -The characteristic absorption peak, 1448 is the characteristic absorption peak of the amide bond -CO-NH-.

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Abstract

The invention relates to a graphene oxide-cadmium telluride/cadmium sulfide nano composite material and a preparation method thereof. The composite material is prepared by loading CdTe/CdS nuclear-shell quantum dot to the surface of PEI-GO by using covalent bonds. The preparation method comprises the following steps: adding the CdTe/CdS nuclear-shell quantum dot and a cross-linking agent into double distilled water, providing ultrasonic wave for 3 hours, further adding PEI-GO, performing ultrasonic reaction for 24 hours, and dialyzing, thereby obtaining the graphene oxide-cadmium telluride/cadmium sulfide nano composite material GO-CdTe/CdS. The GO-CdTe/CdS nano composite material prepared by using the method is relatively large in specific surface area, relatively good in water solubility, relatively high in fluorescence intensity and fluorescence stability, and can be used as a novel nano fluorescence probe which is applied to the fields such as photoelectricity, biosensors and biomedicine.

Description

Technical field [0001] The invention belongs to the field of nano composite materials and preparation thereof, and particularly relates to a graphene oxide-cadmium telluride / cadmium sulfide nano composite material and a preparation method thereof. Background technique [0002] Graphene oxide (GO) is a nanomaterial that is easily functionalized with a large number of epoxy groups, carboxyl groups and hydroxyl groups on the surface obtained by chemically oxidizing graphene. As an important and representative nanomaterial, it has been widely applied in the field of nanomedicine in recent years. The poor stability of graphene oxide in the water phase limits its research in the field of biomedicine to a certain extent. Further functionalization of graphene oxide surface by chemical methods can not only improve its dispersibility, but also introduce some active functional groups to give it new properties, such as reducing toxicity and increasing biocompatibility. In addition to the b...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88G01N21/64
Inventor 朱利民丁兆强聂华丽
Owner DONGHUA UNIV
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