Control method for gold atom deposition on silver nanostructure

A technology of atomic deposition and control method, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of single deposition mode, no clear exploration of gold atom deposition mechanism, etc. Simple, excellent plasmonic properties, and operability effects

Active Publication Date: 2021-08-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in these reports, the deposition mode of gold atoms is relatively single, and based on the uniform distribution of high-energy surfaces and tip positions in the selected silve...

Method used

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  • Control method for gold atom deposition on silver nanostructure
  • Control method for gold atom deposition on silver nanostructure
  • Control method for gold atom deposition on silver nanostructure

Examples

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Embodiment 1

[0031] A method for controlling deposition of gold atoms on a silver nanostructure, comprising the following steps:

[0032] a. Add 5mL gold nano biconical solution to 20mL, 0.08mol / L cetyltrimethylammonium chloride solution, then add 500μL, 0.01mol / L silver nitrate solution and 250μL, 0.1mol / L silver nitrate solution Ascorbic acid solution, shake the obtained mixed solution and put it into a 65°C oven for 4.5h to react to obtain silver nanorods, such as Figure 1~2 As shown, the silver nanorods have tips, sides and side edges. The tips include 10 {111} faces, the sides include 5 {100} faces, the side edges include 5 {110} faces, and the side edges are high surface energy faces. The surface energy surface and the position of the tip are distributed in an ectopic manner;

[0033] b. Using the silver nanorods obtained in step a as a reaction template, centrifuge at 5000rpm for 10min, and disperse them in 8mL, 0.05mol / L cetyltrimethylammonium bromide solution to obtain a silver ...

Embodiment 2

[0040] A method for controlling deposition of gold atoms on a silver nanostructure, comprising the following steps:

[0041] a. Add 5mL gold nano biconical solution to 20mL, 0.08mol / L cetyltrimethylammonium chloride solution, then add 500μL, 0.01mol / L silver nitrate solution and 250μL, 0.1mol / L silver nitrate solution Ascorbic acid solution, shake the obtained mixed solution and put it in an oven at 65°C for 4.5 hours to react to obtain silver nanorods. The silver nanorods have tips, sides and side edges, the tips include 10 {111} faces, and the sides include 5 {100} plane, the side edge includes 5 {110} planes, the side edge is a high surface energy surface, and the high surface energy surface and the tip position are distributed in an ectopic manner;

[0042]b. Using the silver nanorods obtained in step a as a reaction template, centrifuge at 5000rpm for 10min, and disperse them in 8mL, 0.05mol / L cetyltrimethylammonium bromide solution to obtain a silver nanorod solution;

...

Embodiment 3

[0049] A method for controlling deposition of gold atoms on a silver nanostructure, comprising the following steps:

[0050] a. Add 5mL gold nano biconical solution to 20mL, 0.08mol / L cetyltrimethylammonium chloride solution, then add 500μL, 0.01mol / L silver nitrate solution and 250μL, 0.1mol / L silver nitrate solution Ascorbic acid solution, shake the obtained mixed solution and put it in an oven at 65°C for 4.5 hours to react to obtain silver nanorods. The silver nanorods have tips, sides and side edges, the tips include 10 {111} faces, and the sides include 5 {100} plane, the side edge includes 5 {110} planes, the side edge is a high surface energy surface, and the high surface energy surface and the tip position are distributed in an ectopic manner;

[0051] b. Using the silver nanorods obtained in step a as a reaction template, centrifuge at 5000rpm for 10min, and disperse them in 8mL, 0.05mol / L cetyltrimethylammonium bromide solution to obtain a silver nanorod solution; ...

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Abstract

The invention discloses a control method for gold atom deposition on a silver nanostructure. The control method for gold atom deposition on the silver nanostructure comprises the following steps of S1, taking a gold nano bipyramid as a core, epitaxially growing silver to prepare a silver nanorod, and distributing a high surface energy surface and a tip position in an ectopic mode; S2, dispersing the silver nanorod serving as a reaction template into a hexadecyl trimethyl ammonium bromide solution, adding an ascorbic acid solution, and uniformly stirring; S3, adjusting the pH value of the mixed solution so as to adjust the reducibility of the ascorbic acid solution and to achieve the adjustment of the ratio between the replacement reaction and the co-reduction reaction in a reaction system; and S4, dropwise adding a gold precursor solution into the obtained reaction system, wherein the reaction system is converted into a co-reduction reaction system from a replacement reaction system, and the deposition position of reduced gold atoms is gradually migrated to the tip of the silver nanorod from the high surface energy face. According to the control method for gold atom deposition on the silver nanostructure, controllable deposition of the gold atoms can be achieved by adjusting the pH value of the reaction system, the conditions are simple and mild, and operability is high.

Description

technical field [0001] The invention belongs to deposition control methods, in particular to a control method for deposition of gold atoms on silver nanostructures. Background technique [0002] Hollow nanostructures have attracted extensive attention and applications in the fields of catalysis, sensing, imaging, and drug release due to their large specific surface area and internal volume. Replacement reaction is an effective method to realize the preparation of hollow nanostructures, but the obtained hollow nanostructures have a single morphology and the thickness of the sidewall is difficult to adjust. In recent years, the combination of displacement reaction and co-reduction reaction has further realized the fine control of the morphology parameters of hollow nanostructures, and then obtained a variety of hollow structures such as nanoshells, nanoboxes, nanocages and nanoframes. It has a good application prospect. [0003] The precise synthesis of hollow nanostructures...

Claims

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Application Information

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IPC IPC(8): B22F1/02C23C18/44B22F1/00B82Y30/00B82Y40/00
CPCC23C18/44C23C18/1637B82Y30/00B82Y40/00B22F1/07B22F1/0547B22F1/17
Inventor 朱兴忠徐娟恽沁茹阚彩侠
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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