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Fluorescent carbon nanometer tube and its preparation method and application

A technology of carbon nanotubes and multi-walled carbon nanotubes, which is applied in the field of nanomaterials in the field of biotechnology, can solve the problems of dispersibility and difficult control of particle size, untunable emission wavelength, low biocompatibility, etc., and achieve high fluorescence Intensity and fluorescence stability, conditions and instrument simplification, effects of high surface area

Inactive Publication Date: 2010-07-28
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] The technical problem to be solved in the present invention is to provide a fluorescent carbon nanotube and its preparation method and application, so as to overcome the low biocompatibility, complicated preparation, dispersibility in solution and difficult control of particle size of the existing nano fluorescent materials. Defects with low fluorescence intensity, poor stability, non-tunable emission wavelength and need to be excited by multiple wavelengths

Method used

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  • Fluorescent carbon nanometer tube and its preparation method and application
  • Fluorescent carbon nanometer tube and its preparation method and application
  • Fluorescent carbon nanometer tube and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Preparation of PDDA-MWNTs fluorescent carbon nanotubes

[0055] (1) Preparation of MWNTs suspension

[0056] MWNTs were placed in mixed acid (H 2 SO 4 with HNO 3 The volume ratio is 3:1), and sonicated for 16 hours. The resulting MWNTs suspension was filtered with a 100 nm microporous membrane, and rinsed with twice distilled water until neutral. It was redispersed in double distilled water, and the large particle MWNTs was removed by centrifugal filtration (7000rpm, 5min) several times to obtain the MWNTs suspension (infrared spectrum) with length distribution between 100-500nm and -COOH modified on the tube wall. Such as Figure 4 , TEM as shown in Figure 5).

[0057] (2) Preparation of PDDA-MWNTs aqueous phase system

[0058] Preparation principle: use the electrostatic force between groups.

[0059] Mix 25 μL of 0.1 mg / mL MWNTs suspension with PDDA (MW 200000-350000), and dilute to 5 mL with double distilled water. After ultrasonication for 15 min, the obta...

Embodiment 2

[0064] Preparation of Chitosan-MWNTs fluorescent carbon nanotubes

[0065] Chitosan (Chitosan) was dissolved in 1% HAC to prepare a solution with a concentration of 1 mg / mL. Chitosan-MWNTs fluorescent carbon nanotubes can be prepared by the same method as in Example 1.

Embodiment 3

[0067] Preparation of PEI-MWNTs fluorescent carbon nanotubes

[0068] The PEI-MWNTs fluorescent carbon nanotubes can be prepared by the same method as in Example 1 by replacing the PDDA in Example 1 with polyethyleneimine (PEI) solution.

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Abstract

The invention relates the fluorescent carbon nanometer tube and preparing method. The structure is that the inner core is multiple-carbon nanometer tube, and the material comprises electrostatic action force with cationic polymer and quantum outer layer connected with inner core. The invention provides the method and usage in biomolecule detecting. The invention has the advantages of simple and fast technology. The invention can be used in cell imaging, histopathologic examination, gene detecting, immunoassay, synchronous detecting in biological histology tissue and gene chip.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and more specifically relates to nanomaterials applied in the field of biotechnology. Background technique [0002] Since the discovery of carbon nanotubes (CNTs) in 1991, it has become one of the research hotspots worldwide because of its unique properties. The research on nanomaterials in the field of biology focuses on zero-dimensional nanoparticles, and there are few reports on the application of carbon nanotubes as a one-dimensional nanomaterial with good biocompatibility in the field of biology. [0003] One-dimensional carbon nanotubes have two dimensions in the nanometer scale. According to the number of carbon atomic layers in carbon nanotubes, carbon nanotubes can be roughly divided into two categories: single-walled carbon nanotubes (SWNTs) and multi-walled carbon nanotubes (MWNTs). SWNTs are composed of a single layer of carbon atoms, and the structure has good symmetry and unity....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09C3/10C09C1/44G01N33/52G01N21/64
Inventor 贾能勤连琼
Owner SHANGHAI NORMAL UNIVERSITY
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