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Method for in-situ detection of nano noble metal catalyst

A precious metal catalyst and in-situ detection technology, which is applied in the preparation of test samples and the measurement of color/spectral characteristics, etc., can solve the problems of noble metal nanoparticles that are not mentioned, and achieve low cost, simple and easy method, and rapid detection Effect

Inactive Publication Date: 2011-03-30
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Their rich configuration and uniform particle size determine their catalytic diversity and excellent selectivity, and are widely used in immunoassays, sensor development, molecular electronics, etc. However, the in situ detection methods for noble metal nanoparticles as catalysts have not been no mention

Method used

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  • Method for in-situ detection of nano noble metal catalyst
  • Method for in-situ detection of nano noble metal catalyst
  • Method for in-situ detection of nano noble metal catalyst

Examples

Experimental program
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Embodiment 1

[0014] 1. Preparation of SiO 2 -Synthetic route of Ag composite material:

[0015] ① Synthesis of SiO with different sizes 2 Nanoparticles

[0016] Add 1.7mL of ammonia water to 50.0mL of absolute ethanol, stir the mixture vigorously with a magnetic stirrer, and at the same time add 1.5mL (about 6.7mmol) TEOS (tetraethyl orthosilicate) dropwise. After the solution is stirred for 6 hours, a white diameter of about 40nm is obtained. SiO 2 precipitation. When the volume of ammonia water is changed from 1.7mL to 2.5 or 3.0mL respectively, the above process can obtain 78 or 105nm SiO 2 particle;

[0017] ②, synthesis of amino-functionalized SiO 2

[0018] Take the SiO of 40nm, 78nm and 105nm in the above ① 2 Each sol was 50 mL, and 150 μL of aminopropyltrimethoxysilane (APTMS, used as an amino functionalization reagent) was added respectively and stirred rapidly. After reacting for 3 h, white amino functionalized SiO was obtained at the bottom of the flask. 2 Nanoparticle ...

Embodiment 2

[0024] 1. Preparation of SiO 2 -Synthetic route of Au composites

[0025] ① Synthesis of SiO with different sizes 2 Nanoparticles

[0026] Add 1.7mL of ammonia water to 50.0mL of absolute ethanol, stir the mixture vigorously with a magnetic stirrer, and at the same time add 1.5mL (about 6.7mmol) TEOS (tetraethyl orthosilicate) dropwise. After the solution is stirred for 6 hours, a white diameter of about 40nm is obtained. SiO 2 precipitation. When the volume of ammonia water is changed from 1.7mL to 2.5 or 3.0mL respectively, the above process can obtain 78 or 105nm SiO 2 particle;

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Abstract

The invention belongs to the technical field of nano material detection and in particularly relates to a method for in-situ detection of a nano noble metal catalyst, especially a gold / silver catalyst. In the method, SiO2 subjected to amino functional treatment and 4nm Ag sol or 2-4nm Au sol are used as raw materials and are compounded to form a SiO2-Ag or SiO2-Au composite material which has a core-shell structure and used as a catalyst, the SiO2-Ag composite material catalyst has an obvious catalytic action on the reduction reaction of a NaBH4 catalytic dye, and the SiO2-Au composite material catalyst has an obvious catalytic effect on catalyzing CO to be oxidized into CO2; and an in-situ detection is carried out on SiO2-Ag and SiO2-Au through an ultraviolet visible spectrum, the changes of SPR (Surface Plasmon Resonance) peak position and strength before and after catalyst reaction are compared so as to determine whether the nano silver / gold catalyst is inactivated after reaction or not and ensure the recycling of the nano silver / gold catalyst.

Description

technical field [0001] The invention belongs to the technical field of nanometer material detection, and specifically relates to a method for in situ detection of nanometer precious metals, especially gold and silver catalysts. Background technique [0002] When light is irradiated on the surface of metal nanoparticles, there will be an interaction between the light and the metal. When the frequency of the irradiated light is equal to the natural oscillation frequency of the metal particle, surface plasmon resonance will occur. One of the characteristics of metal nanoparticles is that there is an absorption band in the ultraviolet-visible region, which is caused by the excitation of plasmon resonance on the surface of metal particles. Mie first proposed the conductive ball model theory of metal colloids (Mie G..Ann.Physik, 1908, 25:377). He quantitatively described surface plasmon resonance using the Maxwell equation, which requires spherical particles to have a suitable in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28
Inventor 翟宏菊杨景海孙德武王海水李传碧郑佳红李晶
Owner JILIN NORMAL UNIV
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