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Concave surface gold@silver platinum heterogeneous composite nanoparticles having excellent catalytic and absorption properties and preparing method thereof

A composite nanoparticle, light absorption technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of not showing good surface plasmon resonance absorption characteristics, difficult to prepare gold-silver-platinum composite nanoparticles with optical characteristics, etc. Good surface plasmon resonance absorption performance, excellent catalytic activity, uniform particle size effect

Inactive Publication Date: 2017-06-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the gold-platinum or gold-silver-platinum composite nanoparticles constructed by the above method can effectively improve the catalytic activity and stability of noble metal platinum, they do not show good surface plasmon resonance absorption characteristics.
That is to say, it is difficult to prepare gold-silver-platinum composite nanoparticles with good optical properties by using existing synthetic routes.

Method used

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  • Concave surface gold@silver platinum heterogeneous composite nanoparticles having excellent catalytic and absorption properties and preparing method thereof
  • Concave surface gold@silver platinum heterogeneous composite nanoparticles having excellent catalytic and absorption properties and preparing method thereof
  • Concave surface gold@silver platinum heterogeneous composite nanoparticles having excellent catalytic and absorption properties and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] concave gold @ Preparation of silver-platinum composite nanoparticles

[0034] First, polydiallyldimethylammonium chloride (M w =100000-200000, 20 wt%), chloroauric acid (HAuCl 4 ) aqueous solution, mixed and shaken, moved into 220 degree oil bath and reacted for 3 hours to prepare gold nano-octahedrons with a size of 45 nanometers and obtain gold octahedron seed solution, wherein polydiallyldimethylammonium chloride (M w =100000-200000, 20 wt%), chloroauric acid (HAuCl 4 ) concentration of the aqueous solution is 0.025 mol / L and 0.0005 mol / L respectively. Then take 50 ml gold octahedron seed solution, add silver nitrate (AgNO 3 ), ascorbic acid (AA), potassium tetrachloroplatinate (K 2 PtCl 4 ) aqueous solution to shake well to obtain the reaction precursor solution, in which ascorbic acid (AA), silver nitrate (AgNO 3 ), potassium tetrachloroplatinate (K 2 PtCl 4 ) in the reaction system with final concentrations of 0.0025 mol / L, 0.000015 mol / L, and 0.0000...

Embodiment 2

[0036] gold @ platinum, gold @ Preparation of Silver Core-Shell Composite Nanoparticles

[0037] Take 8 ml gold octahedron seed solution into reaction flasks A and B, then add ascorbic acid (AA), potassium tetrachloroplatinate (K 2 PtCl 4 ), where ascorbic acid (AA), potassium tetrachloroplatinate (K 2 PtCl 4 ) concentrations are 0.0025 mol / L, 0.000015 mol / L, add ascorbic acid (AA), silver nitrate (AgNO 3 ), where ascorbic acid (AA), silver nitrate (AgNO 3 ) final concentrations are 0.0025 mol / L and 0.000015 mol / L, respectively. Finally, reaction bottles A and B were placed in a 220-degree oil bath for 3 hours to obtain a gold@platinum and gold@silver core-shell composite nanoparticle colloidal solution, which was centrifuged at a speed of 8,000 rpm for 20 minutes in a high-speed centrifuge. The colorless solution in the upper layer in the centrifuge tube was removed to obtain a purple and red precipitated product. The precipitated product was ultrasonically clea...

Embodiment 3

[0039] Concave gold composed of different elements @ Preparation of silver-platinum composite nanoparticles

[0040] Take 10 milliliters of colloid 1 solutions and put them into reaction flasks C, D, E, and F respectively, and add 0.0192, 0.0576, 0.096, and 0.1344 milliliters of them at room temperature. 2 PtCl 4 ) aqueous solution, and then reacted in a 220-degree oil bath for 3 hours to obtain a colloidal solution of concave gold@silver-platinum heterogeneous composite nanoparticles with different components. Utilize a high-speed centrifuge to centrifuge at a speed of 10,000 rpm for 30 minutes, remove the colorless solution in the upper layer of the centrifuge tube to obtain a blue precipitate product; use deionized water to ultrasonically clean the precipitate product for 3-5 times to obtain the following: Figure 9 The shown gold-silver-platinum molar ratios are 100:6:3, 100:12:3, 100:18:3, 100:24:3 concave gold@silver-platinum heterogeneous composite nanoparticles.

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Abstract

The invention relates to concave surface gold@silver platinum heterogeneous composite nanoparticles and a preparing method thereof. The method uses prefabricated gold nano-octahedrons as seeds, an ethylene glycol mixed solution containing the gold nano-octahedrons, potassium chloroplatinite, silver nitrate and ascorbic acid is heated in environmental atmosphere by adopting a seed growth method, such that silver and platinum are directionally deposited in six vertexes of the gold nano-octahedrons, and further the gold@silver platinum heterogeneous composite nanoparticles which are uniform in scale, adjustable in component and shaped like a concave surface are formed. The prepared gold@silver platinum heterogeneous composite nanoparticles have better dispersibility and stability in solutions such as water and ethylene glycol and are not agglomerated and deposited or deformed if being preserved at room temperature and environmental atmosphere for long term. The concave surface prepared gold@silver platinum heterogeneous composite nanoparticles obtained by the invention have excellent catalytic activity and optical absorption properties and are expected to have important application values in aspects of surface plasma optics, fuel cells, catalytic hydrogenation and the like.

Description

technical field [0001] The invention relates to a concave gold@silver platinum heterogeneous composite nanoparticle with excellent catalytic activity and light absorption performance and a preparation method thereof. Background technique [0002] Compared with single metal nanoparticles, composite nanoparticles composed of two or more metal elements can not only organically integrate the unique properties of different components, but also use the intermetallic coordination to further enhance the inherent characteristics of metals and incubate new ones. performance. At the same time, people can effectively control the performance of metal composite nanomaterials through various structural factors such as scale, morphology, composition, and structure. As we all know, the precious metal platinum has very excellent catalytic performance, and has very important application value in many fields such as industrial catalysis, fuel cells, and automobile exhaust treatment. Noble met...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/0553B22F1/054
Inventor 张风收李村成李杰张涛徐波刘广宁
Owner UNIV OF JINAN
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