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Three-dimensional porous structure C@NiCo2O4@PPy composite material and preparation method and application thereof

A three-dimensional porous, composite material technology, applied in the field of sensors, can solve the problems of reducing the electrocatalytic performance of the material and the collapse of the porous structure, and achieve the effects of high sensitivity, good stability and wide linear range.

Inactive Publication Date: 2019-04-16
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous structure collapses due to the easy agglomeration of MOFs, which ultimately reduces the electrocatalytic performance of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: (1) First weigh 4mM nickel chloride hexahydrate, 8mM cobalt chloride hexahydrate and 28mM urea and dissolve them in 50mL deionized water, stir and mix evenly, then transfer them to a 100mL polytetrafluoroethylene reaction kettle, and heat at 100°C Water heat for 5 hours. The reaction was cooled to room temperature, the sample solution was taken out, washed with deionized water and absolute ethanol, and dried in a vacuum oven at 60°C for 12 hours to obtain a NiCo LDH nanoarray;

[0023] (2) Mix 50mL methanol solution containing 0.1g NiCo LDH with 50mL methanol solution containing 0.8M 2-methylimidazole, and stir magnetically for 15min at room temperature. Then centrifuge and wash with methanol three times, collect the precipitate, and dry it in a vacuum oven at 60°C;

[0024] Put the dried NiCo LDH@ZIF-67 into a high-temperature tube furnace, and carbonize at 800°C for 2 hours under a nitrogen atmosphere, with a heating rate of 2°C / min, to obtain a C@NiCo2O4 ...

Embodiment 2

[0026] Embodiment 2: change the mol ratio of nickel salt and cobalt salt in step (1) to be 1:1, 1:3, 1:4, 1:5, 1:6, other conditions are the same as embodiment 1, along with Co content The morphology of the product gradually changed from zero-dimensional small particles to two-dimensional nanosheets, and the sheet-like morphology gradually weakened when the amount of Ni and Co increased to 1:6. Among them, 1:2 works best.

Embodiment 3

[0027] Embodiment 3: change the reaction time of NiCo LDH and 2-methylimidazole to be 30min, 1h, 2h, 3h, other conditions are the same as embodiment 1, find that the ZIF-67 crystal size that forms on NiCo LDH nano flakes increases with synthesis increases with time.

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Abstract

The invention belongs to the field of sensors, and particularly relates to a three-dimensional porous structure C@NiCo2O4@PPy composite material and a preparation method and application thereof. The preparation method comprises the steps that 1) nickel salt, cobalt salt and a reducing agent are hydrothermally synthesized into a NiCo LDH nano array; 2) the NiCo-containing LDH nano array and 2-methylimidazole are synthesized into NiCo LDH@ZIF-67, and NiCo LDH@ZIF-67 undergoes high temperature heat treatment to acquire a three-dimensional C@NiCo2O4 material; and 3) the C@NiCo2O4 material and a pyrrole monomer are added into a FeCl3 solution to polymerize the C@NiCo2O4@PPy material. According to the invention, the double metal oxide synergistic action, a three-dimensional porous structure andthe advantages of a conductive polymer are integrated, so that the material has a higher catalytic performance; and the material has the advantages of high sensitivity, wide linear range, good stability and the like for glucose detection.

Description

technical field [0001] The invention belongs to the field of sensors, in particular to a three-dimensional porous structure C@NiCo 2 o 4 @PPy composite materials and their preparation methods and applications. Background technique [0002] Glucose plays an important role in the field of biology. It is the main source of life energy and an important compound in the metabolism of living cells. Problems in the metabolic process of glucose can lead to many diseases such as diabetes and endocrine metabolic disorders. Accurate detection of glucose is critical for the early diagnosis and treatment of diabetes. Therefore, the development of high-performance enzyme-free glucose sensors is crucial. At present, glucose sensors are mainly divided into two types, one is an enzyme sensor based on glucose oxidation, and the other is an enzyme-free sensor with catalytic functionalized materials. Enzyme sensors have high specificity and selectivity, but their activities are highly unstabl...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/327
CPCG01N27/30G01N27/3278
Inventor 黄橡丽王丽丽王兵
Owner TIANJIN UNIV OF COMMERCE
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