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Pd-based composite nano particle and preparation method thereof

A composite nanoparticle and nanoparticle technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of limited modification of electrode conductivity and limited electron transmission distance

Active Publication Date: 2015-01-21
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, due to the limited electron transport distance in these composite nanostructures, the modification of the conductivity of the electrode is still limited, which limits its application in electrochemical sensors.

Method used

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  • Pd-based composite nano particle and preparation method thereof
  • Pd-based composite nano particle and preparation method thereof
  • Pd-based composite nano particle and preparation method thereof

Examples

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preparation example Construction

[0025] refer to figure 1 , the preparation method of the Pd-based composite nanoparticles of one embodiment, comprising the steps of:

[0026] S10. Prepare a mixed solution containing copper salt and stabilizer.

[0027] The concentration of the copper salt is 0.0005mol / L-0.005mol / L, and the molar ratio of the stabilizer to the copper salt is 1:1-10.

[0028] Preferably, the concentration of the stabilizer is 0.0001mol / L-0.05mol / L.

[0029] Stabilizers can be citric acid, cetyltrimethylammonium bromide or polyvinylpyrrolidone.

[0030] The copper salt may be copper chloride or copper sulfate.

[0031] S20. After uniformly stirring the mixed solution obtained in S10 at room temperature for 5 to 10 minutes, add a reducing agent to the mixed solution according to the molar ratio of the reducing agent to copper ions of 1 to 100:1, and then react fully according to the palladium salt and copper salt. Add the palladium salt solution at a molar ratio of 1:5-50, and continue to st...

Embodiment 1

[0043]Add 50mL of 0.0005mol / L copper chloride solution into a 100mL single-necked flask, and then add polyvinylpyrrolidone, the concentration of polyvinylpyrrolidone in the solution is 0.001mol / L. After stirring at room temperature for 5 minutes, 0.02 mL wt of 85% hydrazine hydrate was quickly injected into it. After reacting for 10 minutes, the copper ions are fully reduced and the hydrazine hydrate is fully decomposed, then quickly inject 0.5mL of 0.01mol / L palladium chloride solution into the synthesis solution; after keeping stirring for 10 minutes, the synthesis solution in the flask is deionized Centrifuge with water and ethanol, wash and dry in vacuum to obtain Pd-based composite nanoparticles.

[0044] Such as figure 2 As shown, the Pd-based composite nanoparticles prepared in Example 1 have a mesoporous nanostructure and a rough surface nanostructure, and have uniform size, good monodispersity, and an average particle size of about 90 nm.

[0045] Pure mesoporous C...

Embodiment 2

[0051] Add 50mL of 0.001mol / L copper sulfate solution into a 100mL single-necked flask, and then add polyvinylpyrrolidone, the concentration of polyvinylpyrrolidone in the solution is 0.004mol / L. After stirring at room temperature for 5 minutes, 0.05 mL of 85 wt% hydrazine hydrate was quickly injected thereinto. After reacting for 10 minutes, the copper ions are fully reduced and the hydrazine hydrate is fully decomposed, then quickly inject 0.5mL of 0.01mol / L palladium chloride solution into the synthesis solution; after keeping stirring for 10 minutes, the synthesis solution in the flask is deionized Centrifuged with water and ethanol, washed and dried in vacuum to obtain Pd-modified Cu 2 O nanoparticles.

[0052] Electron microscope observation shows that the Pd-based composite nanoparticles prepared in Example 2 have mesoporous nanostructures and rough surface nanostructures, and are uniform in size and good in monodispersity, with an average particle size of about 105 nm...

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Abstract

The invention discloses a Pd-based composite nano particle and a preparation method thereof. The preparation method comprises the following steps that a mixed solution containing copper salt and a stabilizing agent is prepared; after the mixed solution is stirred for five to ten minutes at an indoor temperature, a reducing agent is added according to the fact that the molar ratio of the reducing agent and copper ions is 1-100:1, after complete reaction, a palladium chloride solution is added according to the fact that the molar ratio of palladium chloride and the copper salt is 1:5-50, and stirring continues at the indoor temperature until complete reaction is achieved; the reaction solution is filtered, then filter slag is kept, and a Cu2O nano particle modified by Pd is obtained after the filter slag is washed and dried. According to the Cu2O nano particle modified by the Pd, the Pd is deposited on the surface of the Cu2O nano particle with a mesoporous structure, so that the electron and mass transmission of the Cu2O nano particle modified by the Pd is improved, the reactivity site of electrocatalysis is improved, and the Cu2O nano particle modified by the Pd has higher electrocatalysis performance compared with simple metallic oxide nano materials.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a Pd-based composite nanoparticle and a preparation method thereof. Background technique [0002] Diabetes is one of the major medical problems affecting the health of 150 million people worldwide. Therefore, sophisticated glucose sensors play a vital role in the early detection and cure of diabetes. Usually enzyme-based glucose sensors utilize the biocatalysts glucose dehydrogenase (GDH) and glucose oxidase (GO x ) for enzymatic electrochemical oxidation of glucose. Although this enzyme-based glucose sensor has high sensitivity, it also has some unavoidable shortcomings. Due to the inherent characteristics of biological enzymes, the long-term stability of the sensor is not enough. At the same time, biological enzymes have strict requirements on the environment and are easily affected by environmental factors, such as temperature, humidity and pH value. In addition, biolog...

Claims

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Application Information

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IPC IPC(8): B22F9/24B01J23/89B82Y40/00B82Y30/00
CPCB01J23/89B22F9/24
Inventor 符显珠郭瑛孙蓉
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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