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Method for preparing pH-responsive carbon nanotube fluorescent probe

A carbon nanotube and fluorescent probe technology is applied in the preparation field of the nanomaterial technology field, and achieves the effects of strong controllability, good water solubility, and a simple and easy preparation method.

Inactive Publication Date: 2009-12-02
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are no related reports on pH-responsive fluorescent carbon tubes with fluorescence enhancement as pH decreases.

Method used

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  • Method for preparing pH-responsive carbon nanotube fluorescent probe
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  • Method for preparing pH-responsive carbon nanotube fluorescent probe

Examples

Experimental program
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Embodiment 1

[0029] Example 1. The single-walled carbon nanotubes prepared by the chemical vapor deposition method are used as the initial raw material. After purification and truncation, acridine orange is adsorbed to the surface of the single-walled carbon nanotubes through non-covalent physical action, and the pH response is obtained. A single-walled carbon nanotube fluorescent probe specifically comprises the following steps:

[0030] Step (a): In a single-necked round-bottomed flask equipped with a magnetic stirring rotor, add 1 g of single-walled carbon nanotube raw material and 4 mol / L nitric acid, treat with 40 kHz ultrasonic waves for 20 min, heat to 95 ° C, stir and reflux React for 12 hours, filter with ф0.22 μm polytetrafluoroethylene microporous membrane, wash repeatedly with a large amount of deionized water until the pH value is 7 to neutral, and dry in vacuum at 50°C for 24 hours to obtain purified carbon nanotubes;

[0031] Step (b): In 300 mL of 98% H with a volume ratio ...

Embodiment 2

[0035] Example 2, using the single-walled carbon nanotubes prepared by catalytic pyrolysis as the initial raw material, after being purified and truncated, acridine orange is adsorbed to the surface of the single-walled carbon nanotubes through non-covalent physical action to obtain a pH-responsive A single-walled carbon nanotube fluorescent probe specifically comprises the following steps:

[0036] Step (a): In a single-necked round-bottomed flask equipped with a magnetic stirring rotor, add 20 mg of single-walled carbon nanotube raw material and 20% sulfuric acid, heat it to 110 ° C after 40 kHz ultrasonic treatment for 15 min, stir and reflux 24h, filter with ф0.22μm polytetrafluoroethylene microporous membrane, wash repeatedly with a large amount of deionized water until the pH value is 7 to neutral, and vacuum dry at 50°C for 24h to obtain purified carbon nanotubes;

[0037] Step (b): In 300 mL of 98% H with a volume ratio of 3:1 2SO 4 and 65% HNO 3 Add 500 mg of the p...

Embodiment 3

[0040] Example 3: Using multi-walled carbon nanotubes prepared by chemical vapor deposition as the initial raw material, after purification and truncation, acridine orange is adsorbed to the surface of multi-walled carbon nanotubes through non-covalent physical action to obtain pH responsiveness Multi-walled carbon nanotube fluorescent probe.

[0041] Step (a): In a single-neck round bottom flask equipped with a magnetic stirring rotor, add 40 mg of multi-walled carbon nanotube raw material and 2.6 mol / L nitric acid, treat with 40 kHz ultrasonic wave for 30 min, heat to 120 ° C, stir and reflux After reacting for 48 hours, filter with ф0.22 μm polytetrafluoroethylene microporous membrane, wash repeatedly with a large amount of deionized water until the pH value is 7 to neutral, and vacuum dry at 50°C for 24 hours to obtain purified carbon nanotubes;

[0042] Step (b): In 300 mL of 98% H with a volume ratio of 3:1 2 SO 4 and 65% HNO 3 Add 500 mg of the purified carbon nanotu...

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Abstract

The invention discloses a method for preparing pH-responsive carbon nanotube fluorescent probe in the technical field of nano materials, which comprises the following steps: mixing a carbon nanotube raw material and an oxidizing acid, sequentially subjecting the mixture to supersonic treatment, stirring treatment and suction filtration, and washing the product of the suction filtration till the product is neutral to obtain purified carbon nanotubes; mixing the purified carbon nanotubes with the oxidizing acid again, sequentially subjecting the mixture to supersonic treatment, secondary stirring treatment and suction filtration, and washing the product of the suction filtration till the product is neutral to obtain purified cut nanotubes; and subjecting aqueous solution of purified cut nanotubes to supersonic treatment, adding acridine orange into the aqueous solution, subjecting the mixture to supersonic treatment again, keeping the mixture away from light, stirring the mixture, subjecting the mixture to suction filtration, washing and dialyzing the product of the suction filtration, and drying the product at room temperature under vacuum to obtain the pH-responsive carbon nanotube fluorescent probe. The preparation method provided by the invention is simple, easy to implement and high in controllability. The product of the method has a unique pH- responsive property and has wide application prospects in terms of nanoscience, materials science, biomedical science and the like.

Description

technical field [0001] The invention relates to a preparation method in the technical field of nanomaterials, in particular to a preparation method of a pH-responsive carbon nanotube fluorescent probe. Background technique [0002] Carbon Nanotube (CNT for short) is a new type of carbon structure discovered in recent years (S.Iijima, Nature 1991, 354, 56), which is a seamless graphene sheet formed by carbon atoms. Hollow carbon tubes, capped by half fullerene molecules at both ends, are one-dimensional quantum materials with highly delocalized π-electron conjugated systems. Carbon nanotubes are divided into single-wall nanotubes (Single-wall Nanotube, SWCNT) and multi-wall carbon nanotubes (Multi-wall Nanotube, MWCNT). Its preparation methods mainly include catalytic pyrolysis, arc discharge, template method, chemical vapor deposition method and so on. [0003] Since the advent of carbon nanotubes (CNT), due to its unique electronic and mechanical properties and quasi-one-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 张晓科孟令杰路庆华
Owner SHANGHAI JIAO TONG UNIV
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