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Nano-gold/manganese dioxide/graphene-carbon nanotube three-dimensional structural nano complex and hydrogen peroxide sensor prepared by using complex

A nanocomposite, carbon nanotube technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical/physical process, etc., can solve the problem that the particle size is difficult to control, uneven distribution, The problems of different sizes of metal nanoparticles can achieve the effect of high selective detection, simple preparation method and extended application range.

Inactive Publication Date: 2018-07-06
ANYANG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the methods reported in the literature, metal nanoparticles are often deposited on the surface of manganese dioxide / carbon materials by chemical reduction. The metal nanoparticles prepared by this method are of different sizes, difficult to control the particle size, and unevenly distributed.

Method used

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  • Nano-gold/manganese dioxide/graphene-carbon nanotube three-dimensional structural nano complex and hydrogen peroxide sensor prepared by using complex
  • Nano-gold/manganese dioxide/graphene-carbon nanotube three-dimensional structural nano complex and hydrogen peroxide sensor prepared by using complex
  • Nano-gold/manganese dioxide/graphene-carbon nanotube three-dimensional structural nano complex and hydrogen peroxide sensor prepared by using complex

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Embodiment 1

[0031] A preparation method of nano-gold / manganese dioxide / graphene-carbon nanotube three-dimensional structure nanocomposite, which comprises the following steps (see the schematic diagram of the preparation process in figure 1 ):

[0032] 1) Disperse 1.0 g of carbon nanotubes in 100 mL of distilled water and add 2 mL of concentrated H 2 SO4 and 6 mL concentrated HNO 3 After stirring at 70 °C for 3 hours; then placed in ice water and rapidly cooled to 0 °C, and then added 6 mL of concentrated H 2 SO 4 , heated to 55°C after mixing;

[0033] 2) Add 3.0 g KMnO to the product obtained in step 1) 4 , stirred and reacted for 2.5 hours, then heated to 90 ° C, the obtained product was filtered and dried, and kept at 190 ° C for 4 hours to obtain manganese dioxide / graphene-carbon nanotube material;

[0034] 3) Take 11 g of the manganese dioxide / graphene-carbon nanotube material obtained in step 2), add 18 mL of absolute ethanol, 3 mL of distilled water, 3 mL of concentrated ammo...

Embodiment 2

[0050] A preparation method of nano-gold / manganese dioxide / graphene-carbon nanotube three-dimensional structure nanocomposite, which comprises the following steps:

[0051] 1) Disperse 0.8 g of carbon nanotubes in 100 mL of distilled water, add 1 mL of concentrated H 2 SO 4 and 5 mL of concentrated HNO 3 After stirring at 65 °C for 2 hours; then placed in ice water and rapidly cooled to 0 °C, and then added 5 mL of concentrated H 2 SO 4 , and heated to 50°C after mixing;

[0052] 2) Add 2.8 g of KMnO to the product obtained in step 1) 4 , stirred and reacted for 2 hours, then heated to 85 ° C, the obtained product was filtered and dried, and kept at 180 ° C for 3 hours to obtain manganese dioxide / graphene-carbon nanotube material;

[0053] 3) Take 10 g of the manganese dioxide / graphene-carbon nanotube material obtained in step 2), add 15 mL of absolute ethanol, 2 mL of distilled water, 2 mL of concentrated ammonia and 200 µL of 3-aminopropyltrimethoxysilane in sequence, ...

Embodiment 3

[0057] A preparation method of nano-gold / manganese dioxide / graphene-carbon nanotube three-dimensional structure nanocomposite, which comprises the following steps:

[0058] 1) Disperse 1.2 g of carbon nanotubes in 100 mL of distilled water, add 3 mL of concentrated H 2 SO 4 and 7 mL concentrated HNO 3 After stirring at 75 °C for 4 hours; then placed in ice water and rapidly cooled to 0 °C, and then added 7 mL of concentrated H 2 SO 4 , heated to 60°C after mixing;

[0059] 2) Add 3.2 g of KMnO to the product obtained in step 1) 4 , stirred and reacted for 2.5 hours, then heated to 95 ° C, the obtained product was filtered and dried, and kept at 200 ° C for 4 hours to obtain manganese dioxide / graphene-carbon nanotube material;

[0060] 3) Take 12 g of the manganese dioxide / graphene-carbon nanotube material obtained in step 2), add 20 mL of absolute ethanol, 4 mL of distilled water, 4 mL of concentrated ammonia and 400 µL of 3-aminopropyltrimethoxysilane in sequence, The r...

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Abstract

The invention relates to a preparation method for a nanogold / manganese dioxide / graphene-carbon nanotube three-dimensional structural nano complex. The method specifically comprises the following steps: firstly carbon nanotubes are oxidized by a strong acid, and graphene oxide is stripped from the surfaces of the carbon nanotubes in the oxidation process, so that a graphene oxide-carbon nanotube three-dimensional carbon structure is formed; then KMnO4 is added to make manganese dioxide deposited on the surface of the carbon material, and the graphene oxide can be reduced to graphene through high-temperature heating; and manganese dioxide / graphene-carbon nanotubes are subjected to amination treatment, negatively-charged colloidal gold nanoparticles are immobilized on the surfaces of the aminated carbon nanotubes by utilizing electrostatic interaction, and therefore the complex is obtained. The preparation method provided by the invention is simple, and sandwich design of the manganese dioxide solves the problems of conductivity and stability of a manganese dioxide material and expands the application range of the manganese dioxide material; and a sensor prepared by using the complexrealizes rapid, sensitive and high-selectivity detection on hydrogen peroxide, and has potential application prospects.

Description

technical field [0001] The invention belongs to the technical field of novel nanometer functional materials and electrochemical sensors, and in particular relates to a nanometer gold / manganese dioxide / graphene-carbon nanotube three-dimensional structure nanocomposite and a preparation method thereof, and a hydrogen peroxide electrode constructed with the nanocomposite. chemical sensor. Background technique [0002] Manganese dioxide is widely used to construct electrochemical sensors due to its good electrocatalytic properties, high abundance distribution, and excellent adsorption capacity. However, manganese dioxide has poor electrical conductivity, and the manganese dioxide material is easily decomposed in an acidic medium or at a high negative potential. Therefore, most of the current manganese dioxide-based electrochemical sensors are limited to alkaline environments or used in high detection potentials, which greatly limit its application range and performance improvem...

Claims

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Application Information

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IPC IPC(8): B01J23/68G01N27/26
CPCG01N27/26B01J23/688B01J35/23B01J35/33
Inventor 李素娟侯琳琳常勇
Owner ANYANG NORMAL UNIV
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