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Dog-bone-shaped gold nanocrystal preparing method

A gold nano, dog-bone-shaped technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of cumbersome and complicated operation process, and achieve good repeatability, simple operation, and reliability strong control effect

Active Publication Date: 2015-08-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to obtain columnar nanorods first, and then use this as a precursor for secondary modification to obtain dog-bone nanocrystals. The operation process is relatively complicated and cumbersome.

Method used

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  • Dog-bone-shaped gold nanocrystal preparing method
  • Dog-bone-shaped gold nanocrystal preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Preparation of growth solution: Add 40 mL, 0.10 M CTAB solution, 0.6 mL, 50 mM chloroauric acid solution, and 0.062 mL, 50 mM silver nitrate solution to the round-bottomed flask, and mix thoroughly under magnetic stirring; then add 0.5 mL, 0.080 M of ascorbic acid;

[0030] 2. Preparation of seed solution: Under magnetic stirring, thoroughly mix 5.0 mL, 0.1M CTAB and 0.03 mL, 50 mM chloroauric acid aqueous solution, then add 0.30 mL, 0.01M sodium borohydride solution in ice bath, at this time The color of the solution changed from yellow to brown, and continued to stir for 2-20 minutes until the color of the solution changed to brown, and the seed solution was obtained;

[0031] 3. Immediately add 0.08 mL of the fresh seed solution prepared above to the growth solution, mix thoroughly, and let stand at 27-30°C for 20 hours to obtain dog-bone-shaped gold nanocrystals, the length of which is about 40 nm, 15 nm wide, with slightly bony protrusions at the ends.

Embodiment 2

[0033] 1. Preparation of growth solution: Add 40 mL, 0.10 M CTAB solution, 0.6 mL, 50 mM chloroauric acid solution, and 0.08 mL, 50 mM silver nitrate solution to a round-bottomed flask, and mix thoroughly under magnetic stirring; then add 0.5 The ascorbic acid of mL, 0.080 M;

[0034] 2. Preparation of seed solution: Under magnetic stirring, thoroughly mix 5.0 mL, 0.1M CTAB and 0.03 mL, 50 mM chloroauric acid aqueous solution, then add 0.30 mL, 0.01M sodium borohydride solution in ice bath, at this time The color of the solution changed from yellow to brown, and continued to stir for 2-20 minutes until the color of the solution changed to brown, and the seed solution was obtained;

[0035] 3. Immediately add 0.08 mL of the fresh seed solution prepared above to the growth solution, mix well, and let it grow for 20 hours at 27-30°C to obtain dog-bone-shaped gold nanocrystals, the length of which is about 40 nm, the width is about 15 nm, and the bony protrusion at the end tends ...

Embodiment 3

[0037] 1. Preparation of growth solution: Add 40 mL, 0.10 M CTAB solution, 0.6 mL, 50 mM chloroauric acid solution and 0.0965 mL, 50 mM silver nitrate solution to the round-bottomed flask, and mix thoroughly under magnetic stirring; then add 0.5 mL, 0.080 M of ascorbic acid;

[0038] 2. Preparation of seed solution: Under magnetic stirring, thoroughly mix 5.0 mL, 0.1M CTAB and 0.03 mL, 50 mM chloroauric acid aqueous solution, then add 0.30 mL, 0.01M sodium borohydride solution in ice bath, at this time The color of the solution changed from yellow to brown, and continued to stir for 2-20 minutes until the color of the solution changed to brown, and the seed solution was obtained;

[0039]3. Immediately add 0.08 mL of the fresh seed solution prepared above to the growth solution, mix well, and let stand at 27-30°C for 20 hours to obtain a dog-bone-shaped seed with a length of about 45 nm and a width of about 16 nm. gold nanocrystals, such as figure 1 shown. It can be seen fr...

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Abstract

The invention discloses a dog-bone-shaped gold nanocrystal preparing method. The dog-bone-shaped gold nanocrystal preparing method includes the steps of adding an aqueous cetyl ammonium bromide solution in an aqueous chloroauric acid solution, adding a silver nitrate solution, mixing fully, adding ascorbic acid, and mixing with stirring to obtain a growth solution; mixing the aqueous cetyl ammonium bromide solution with the aqueous chloroauric acid solution, adding a sodium borohydride solution, and stirring until the mixed solution turns into claybank so as to obtain a seed solution; adding the seed solution in the growth solution, mixing with stirring, and standing for growing to obtain dog-bone-shaped gold nanocrystals. The dog-bone-shaped gold nanocrystal preparing method has the advantages of easily-available raw materials, simplicity in operation, good repeatability, low cost, high controllability and capabilities of obtaining stable and efficient dog-bone-shaped gold nanocrystal and obtaining different sizes of dog-bone-shaped gold nanocrystals by means of reacting condition adjustment, has important application value for synthesis of large-scale dog-bone-shaped gold nanocrystals and is of important guiding significance to gold nanocrystal preparing method research.

Description

technical field [0001] The invention relates to a method for preparing rod-like gold nanocrystals, in particular to a method for preparing dogbone-like gold nanocrystals. Background technique [0002] In recent years, anisotropic gold nanorods have attracted extensive attention due to their unique tunable optical properties and geometric structures, which have potential application value in biological analysis. Gold nanorods are rod-shaped gold nanoparticles with a size ranging from a few nanometers to hundreds of nanometers. As a noble metal material, gold has very stable chemical properties. Gold nanomaterials inherit the properties of its bulk materials and have relatively stable but very rich physical and chemical properties. Gold nanorods have continuously adjustable surface plasmon resonance absorption peaks from the visible to the near-infrared region with the change of aspect ratio, extremely high surface electric field strength enhancement effect, great optical abs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
Inventor 陈玲芦思珉杨萍
Owner UNIV OF JINAN
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