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Magnetic flourescent nano material for magnetic-photo sensor and preparation method thereof

A fluorescent nanomaterial and nanomaterial technology are applied in the field of magnetic fluorescent nanomaterials and their preparation, which can solve the problems of reduced quantum yield and magnetic fluorescent nanoparticle quantum yield, and achieve the effect of improving the accuracy and sensitivity of use.

Inactive Publication Date: 2010-06-09
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common problem of these magnetic fluorescent nanoparticles is that there are particle and interface interactions between MNPs and QDs, which will cause MNPs to quench QDs, and the quantum yield of magnetic fluorescent nanoparticles will be greatly reduced, such as the aforementioned γ-Fe 2 o 3 / QDs, whose quantum yield is reduced from 0.61 of QDs to 0.18

Method used

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  • Magnetic flourescent nano material for magnetic-photo sensor and preparation method thereof
  • Magnetic flourescent nano material for magnetic-photo sensor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Prepare 20ml of FeCl with a molar concentration of 0.1mol / L 2 and 40ml of FeCl with a molar concentration of 0.1mol / L 3 Ethanol solution; take another 2.0 g of fluid-like carbon nanotubes with carboxylic acid functional groups, add them to 40 ml of absolute ethanol and stir for 30 min, place the two solutions in a shaker at 30-50 ° C for 24 h, and add mole The concentration is 17 ml of 1M ammonia water to obtain a composite solution in which magnetic nanoparticles grow on fluid-like carbon nanotubes; add gelatin or aspartic acid aqueous solution with a molar concentration of 0.1 mol / L to it according to a volume ratio of 2.5:1, and react for 4 hours , mixed and adsorbed repeatedly to obtain the fluid-like carbon nanotubes / MNPs nanomaterials coated with amphiphiles, which were dispersed in 40ml deionized water, and CdS@CdSe core-shell quantum dots dispersed in n-hexane at a molar ratio of 1:1 Ligand exchange is carried out to prepare fluid-like carbon nanotubes / MNPs / QDs...

Embodiment 2

[0024] Prepare 10ml of FeCl with a molar concentration of 0.1mol / L 2 and 20ml of FeCl with a molar concentration of 0.1mol / L 3 Absolute ethanol solution; take 3g of acidified carbon nanotubes and add them to 40ml of absolute ethanol and stir for 1h, mix the two and place them in a shaker at 30-50°C for 24h, add 20ml of NaOH solution with a molar concentration of 0.1M after dialysis, Continue to react for 5 hours to obtain an ethanol solution of acidified carbon nanotubes / MNPs nanoparticles, add 40ml of dendritic polyurethane aqueous solution with a molar concentration of 0.1mol / L to it according to the volume ratio of 2.5:1, and continue to react for 4h to obtain coated amphiphile molecules The acidified carbon nanotubes / MNPs nanoparticles were dispersed in 40ml deionized water, and the molar concentration of Au nanoparticles dispersed in dichloromethane was 0.1mol / L for ligand exchange to prepare acidified carbon nanotubes / MNPs MNPs / Au nanoparticle materials. Its quantum fl...

Embodiment 3

[0026] Dissolve 1.2g of polyaniline in 40ml of N-methylpyrrolidone, add 30ml of α-Fe with a molar concentration of 0.1mol / L 2 o 3 Stir in the N-methylpyrrolidone dispersion for 1 hour, place in a shaker at 30-50°C for uniform adsorption reaction for 24 hours, and then centrifuge for 3 times, each time for 15 minutes, at a speed of 5000 rpm. According to the volume ratio of 2:1, 35 ml of arginine aqueous solution with a molar concentration of 0.1 mol / L was added thereto, and after continuing to react for 4 hours, polyaniline / MNPs nanoparticles coated with amphiphilic molecules were obtained, which were dispersed in 35 ml of deionized water , Polyaniline / MNPs / QDs materials were prepared by ligand exchange with ZnS@CdSe quantum dots dispersed in n-hexane with a molar concentration of 0.15mol / L. Its quantum fluorescence yield is between 70%-80%, and its magnetic properties are 50-65emu / g.

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Abstract

The invention provides a magnetic flourescent nano material for a magnetic-photo sensor and a preparation method thereof. The material is a magnetic flourescent nano material based on nano tubes or nano-fiber micro templates and comprises a tubular or fibroid nano material template with a carboxylic acid functional group, a magnetic material, a biparental molecular material and a quantum dot material. The functional group of the template is chelated with Fe<2+>, Fe<3+>, or Co<2+>; the magnetic material such as Fe2O3, Fe3O4, or FeCo generated after reaction under the action of alkali grows on the surface of the template; the biparental molecule is gelatin, amino acid, polypeptide, or dendroid with a carboxylic end group, one end of which contains carboxyl and the other end contains amino or sulfydryl; the carboxyl of polyamide-amine which is a dendroid molecule is chelated with Fe2O3, Fe3O4, or FeCo nano grains on the template; the amino or the sulfydryl is combined with the quantum dot to obtain the megnetic flourescent nano material through assembling. The nano material has strong magnetic property, high quantum yield and good electrical property. After applied to the preparation of magnetic-photo sensors, the nano material can improve the accuracy and the sensitivity of the magnetic-photo sensors.

Description

technical field [0001] The invention belongs to the field of multifunctional nanometer materials, and in particular relates to a magnetic fluorescent nanometer material capable of responding to signals such as magnetism, electricity and light, which can be used in a magneto-optical sensor, and a preparation method thereof. Background technique [0002] Magneto-optical sensors have been paid more and more attention in recent years due to their characteristics of miniaturization, multi-function and high precision. This sensor has higher detection accuracy and sensitivity than the current single signal response magnetic sensor or optical sensor. The core materials used in magneto-optic sensors must have the characteristics of simultaneous response to magnetic and optical signals. It is often obtained by controlled self-assembly of nanostructured materials with different functions, that is, magnetic nanoparticles (MNPs) responsive to magnetic signals are controllably assembled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B1/00B82B3/00C09K11/88C09K11/87H01F1/01H01F41/00
Inventor 董丽杰熊传溪熊军冯啓松黄静汪越
Owner WUHAN UNIV OF TECH
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