Noble metal nanostructure as well as preparation method and application thereof

A nanostructure and noble metal technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of large particle size and uneven size, achieve uniform size and shape, and prepare The effect of simple process and pure gold nanostructure system

Active Publication Date: 2015-07-15

THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA

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AI-Extracted Technical Summary

Problems solved by technology

However, there are still some problems in the preparation of noble metal nanostructures by laser ...

Method used

The gold nanostructure that embodiment 1 prepares is carried out transmission electron microscope TEM scanning and high-resolution transmission electron microscope HRTEM scanning, scanning result is as shown in Figure 2 (Fig. 2 is the transmission electron microscope TEM image and height of the gold nanostructure prepared by embodiment 1 resolution transmission electron microscope HRTEM...

Abstract

The invention relates to a preparation method of a noble metal nanostructure. The preparation method comprises the following steps: putting a noble metal sheet in a solution containing nano graphene oxide, and carrying out ablation on the noble metal sheet by using pulse laser to obtain the noble metal nanostructure. The noble metal nanostructure prepared by using the preparation method is more uniform in size and appearance and controllable in grain size; with the increase of the concentration of a nano graphene oxide seed promoter, the size of a gold nanostructure becomes smaller and smaller and the dispersity becomes better and better; the prepared gold nanostructure system is pure, free of chemical residual and good in biocompatibility and lays a favorable foundation on the subsequent study in the biomedical field; the preparation method is simple and easily controllable in conditions.

Application Domain

Material nanotechnology

Technology Topic

Biocompatibility TestingOxide +7

Image

Examples

Experimental program(7)
Comparison scheme(1)
Effect test(1)

Example Embodiment

[0051] The method for preparing gold nanostructure provided by the invention comprises the following steps:

[0052] (1) Provide a precious metal sheet, and perform mechanical polishing on it, and place it in a reaction vessel;

[0053] (2) Inject the nano-graphene oxide solution into the reaction vessel, and the liquid level of the solution is not over the precious metal sheet;

[0054](3) The pulsed laser passes through the reaction vessel and the nano-graphene oxide solution, focuses on the surface of the precious metal sheet, and ablate the precious metal sheet;

[0055] (4) The solution in the reaction vessel is separated through a microporous membrane, and then the nanometer graphene oxide particles are removed by dialysis through a dialysis bag.

[0056] in, figure 1 A schematic diagram of obtaining noble metal nanostructures by liquid-phase pulsed laser ablation under the action of a nano-graphene oxide seed promoter provided by the present invention.

Example Embodiment

[0057] Example 1

[0058] A method for preparing a gold nanostructure, comprising the steps of:

[0059] (1) Provide a gold flake, perform mechanical polishing, and place it in a reaction vessel; the purity of the gold flake is ≥99.99wt%; the thickness of the gold flake is 1mm;

[0060] (2) injecting the nano graphene oxide solution that concentration is 200mg/L into the reaction vessel, and the liquid level has not crossed the gold flake; the nano graphene oxide is a seed promoter; the particle diameter of the nano graphene oxide is 1~ 2nm;

[0061] (3) Provide a pulse laser generating device, guide the laser generated by it into the reaction container through the optical path conversion device, and focus on the surface of the gold sheet, and ablate the gold sheet;

[0062] The pulsed laser generating device is a Nd:YAG pulsed laser, the excitation wavelength is 532nm, and the pulse frequency is 10Hz; the laser energy is adjusted by adjusting the voltage of the pulsed laser generating device, so that its energy range is 110-130mJ; the laser is focused on the gold The diameter of the spot formed on the surface of the sheet is ≤2mm; the ablation time is 10min;

[0063] (4) Separation of the solution after pulse laser ablation: the solution containing gold nanostructures after step (3) pulse laser ablation is filtered through a microporous membrane with a pore size of 220nm, and the filtrate is filtered with a molecular weight cut-off of 3.5KD The dialysis bag was dialyzed for 12 hours to obtain the product—gold nanostructure.

[0064] Carry out transmission electron microscope TEM scan and high resolution transmission electron microscope HRTEM scan to the gold nanostructure that embodiment 1 prepares, scan result is as follows figure 2 ( figure 2 For the transmission electron microscope TEM image and the high-resolution transmission electron microscope HRTEM image) of the gold nanostructure prepared in embodiment 1; from figure 2 It can be seen that the size distribution range of the prepared gold nanoparticles is between 1 and 5nm, the particle size distribution is relatively uniform, and the dispersion is good; it can be seen from the high-resolution transmission electron microscope (HRTEM) that the lattice spacing of 0.235nm is attributed to the (111) crystal of the gold nanoparticles. noodle;

[0065] Carry out X-ray diffraction to the gold nanostructure that embodiment 1 prepares, the result is as follows image 3 as shown ( image 3 It is the X-ray diffraction (XRD characterization image) of the gold nanostructure prepared in embodiment 1); from image 3 It can be seen that the characteristic diffraction peaks corresponding to gold nanoparticles (111) (200) (220) (311);

[0066] Carry out X-photoelectron energy spectrum scanning to the gold nanostructure that embodiment 1 prepares, the result is as follows Figure 4 as shown ( Figure 4 For the X-photoelectron energy spectrum (XPS characterization image) of the gold nanostructure prepared in embodiment 1); From Figure 4 It can be seen that X-ray photoelectron spectroscopy shows the peak positions of the 4f7/2 and 4f5/2 peaks of gold nanoparticles.

Example Embodiment

[0067] Example 2

[0068] A method for preparing a gold nanostructure, comprising the steps of:

[0069] (1) Provide a gold flake, perform mechanical polishing, and place it in a reaction vessel; the purity of the gold flake is ≥99.99wt%; the thickness of the gold flake is 1mm;

[0070] (2) injecting the nano-graphene oxide solution that concentration is 40mg/L into reaction vessel, and the liquid level has not crossed described gold flake; Described nano-graphene oxide is seed promoter; The particle diameter of nano-graphene oxide is 1~ 2nm;

[0071] (3) Provide a pulse laser generating device, guide the laser generated by it into the reaction container through the optical path conversion device, and focus on the surface of the gold sheet, and ablate the gold sheet;

[0072] The pulsed laser generating device is a Nd:YAG pulsed laser, the excitation wavelength is 532nm, and the pulse frequency is 10Hz; the laser energy is adjusted by adjusting the voltage of the pulsed laser generating device, so that its energy range is 110-130mJ; the laser is focused on the gold The diameter of the spot formed on the surface of the sheet is ≤2mm; the ablation time is 10min;

[0073] (4) Separation of the solution after pulse laser ablation: the solution containing gold nanostructures after step (3) pulse laser ablation is filtered through a microporous membrane with a pore size of 220nm, and the filtrate is filtered with a molecular weight cut-off of 3.5KD The dialysis bag was dialyzed for 12 hours to obtain a product—a gold nanostructure with a particle size of 3-9 nm.

PUM

Property	Measurement	Unit
Thickness	0.5 ~ 5.0	mm
Particle size	1.0 ~ 20.0	nm
Wavelength	532.0 ~ 1060.0	nm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

good repeatability
Simple preparation process

Noble metal nanostructure as well as preparation method and application thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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