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Method for preparing high-purity anti-oxidization base metal nano particles with liquid-phase laser erosion method

A liquid-phase laser ablation and nanoparticle technology, which is applied in nanotechnology and other directions, can solve the problems of unfavorable application, high product impurities, and high risk, and achieve the effects of low cost, good dispersibility, environmental friendliness and no pollution.

Inactive Publication Date: 2015-12-30
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Li Xiaojie and others used ferric nitrate and nickel nitrate as precursors and acetone as carbon source to prepare carbon-coated metal particles by explosive method. This method is complicated to operate, high in risk, and the product has many impurities, which is not conducive to put into application (Li Xiaojie, Luo Ning, Yan Honghao et al. Preparation of carbon-coated iron-nickel alloy nanoparticles by detonation method and its characterization[J]. Rare Metal Materials and Engineering, 2010) Oxidation resistance is an indispensable property of nano-metal particles, especially base metal nanoparticles. Oxidation-resistant base metal nanoparticles can be used in technical fields such as photodetector enhancement and surface-enhanced Raman

Method used

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  • Method for preparing high-purity anti-oxidization base metal nano particles with liquid-phase laser erosion method
  • Method for preparing high-purity anti-oxidization base metal nano particles with liquid-phase laser erosion method
  • Method for preparing high-purity anti-oxidization base metal nano particles with liquid-phase laser erosion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1. Choose high-purity Cr metal target as raw material;

[0024] Step 2. Use 500#, 1200#, 2500# sandpaper to polish the Cr metal target repeatedly to remove possible surface oxides and keep the target surface flat and smooth;

[0025] Step 3. Prepare a mixture of methanol and ethanol at a volume ratio of 1:1 as the prepared liquid environment, and use the prepared solution to ultrasonically clean the target to remove impurities;

[0026] Step 4. Put the target into the quartz container and add the methanol and ethanol mixed solution so that the distance between the upper surface of the mixed solution and the surface of the base metal target is 5 mm, and start to continuously pass inert protective gas into the container to remove oxygen;

[0027] Step 5: Repeatedly focus, and select 101mJ laser energy to laser ablate the target for 20 minutes, and simultaneously perform magnetic stirring. Then, the anti-oxidation Cr metal nano particles with the carbon coating protective la...

Embodiment 2

[0030] Step 1. Select high-purity Fe metal target as raw material;

[0031] Step 2. Use 500#, 1200#, 2500# sandpaper to repeatedly sand the Fe metal target to remove possible surface oxides and keep the target surface flat and smooth;

[0032] Step 3. Prepare the n-hexane solution as the prepared liquid environment, and use the prepared solution to ultrasonically clean the target to remove impurities;

[0033] Step 4. Put the target into a quartz container and add n-hexane to make the distance between the upper surface of the mixed solution and the surface of the base metal target 10 mm, and start to continuously pass inert protective gas into the container to remove oxygen;

[0034] Step 5: Repeatedly focus, and select 300mJ laser energy to laser ablate the target for 30 minutes, and perform magnetic stirring at the same time. Afterwards, the anti-oxidation Fe metal nanoparticles with carbon-coated protective layer can be obtained.

[0035] Observe the prepared anti-oxidation Fe metal...

Embodiment 3

[0037] Step 1. Select high-purity Mn metal target as raw material;

[0038] Step 2. Use 500#, 1200#, 2500# sandpaper to polish the Mn metal target repeatedly to remove possible surface oxides and keep the surface of the target flat and smooth;

[0039] Step 3. Prepare the n-heptane solution as the prepared liquid environment, and use the prepared solution to ultrasonically clean the target to remove impurities;

[0040] Step 4. Put the target into a quartz container and add n-hexane, and start to continuously pass inert protective gas into the container to remove oxygen;

[0041] Step 5. Focusing is repeated, and 233mJ laser energy is selected to laser ablate the target for 40 minutes, and magnetic stirring is performed at the same time. Afterwards, the oxidation-resistant Mn metal nanoparticles with carbon-coated protective layer can be obtained.

[0042] Figure 4 In order to prepare the ultraviolet-visible absorption pattern of the anti-oxidation manganese metal nanoparticles, in t...

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Abstract

The invention discloses a common and rapid method for preparing anti-oxidization base metal nano particles. The anti-oxidization base metal nano particles are prepared by using a liquid-phase laser erosion method in a liquid-phase environment. The method comprises the following steps: firstly, putting a base metal target into an organic solvent; continuously introducing inert gas while stirring; and secondly, focusing pulse laser beams on the surface of the base metal target to carry out erosion to obtain the anti-oxidization base metal nano particles with carbon covering layers. The base metal nano particles prepared by the invention have small grain diameters, narrow grain diameter distribution and good monodispersity, and are provided with the anti-oxidization carbon covering layers. The method is simple to operate, has low cost, is environmentally friendly, has no pollution and has no demanding requirements on operation environments; and the base metal nano particles can be prepared under a constant-temperature and normal-pressure environment and have a wide application prospect in the fields of construction of nano devices, enhancement of an optical detector, surface-enhanced Raman, biomarkers and the like.

Description

Technical field [0001] The invention belongs to the technical field of nano material preparation, and specifically relates to a method for preparing high-purity anti-oxidation base metal nanoparticles by a liquid phase laser ablation method. Background technique [0002] Metal nanoparticles have special properties, such as enhancement of specific light absorption, local plasmon resonance effects, etc., and can be used in fields such as catalysis, photodetector enhancement, biomarkers, information storage, and surface enhanced Raman scattering. Research on the preparation methods of metal nanoparticles mostly focuses on precious metals such as gold and silver. Usually, different protective components (water-soluble polymers, long-chain amines, etc.) are selected, a variety of precious metal salts are used as the precursors of the reaction, and suitable reducing agents and reaction environments are used. , To prepare precious metal nanoparticles mainly in a gas phase environment an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/06B82Y40/00
Inventor 曾海波杨正铭韩晶晶鲁彤唐双凌
Owner NANJING UNIV OF SCI & TECH
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