Method for producing metallic nanomaterials through femtosecond lasers

A metal nano and femtosecond laser technology, applied in the field of metal nano materials, can solve the problems of low light intensity and long irradiation time, and achieve the effect of simple and easy control of reaction conditions

Active Publication Date: 2013-02-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low light intensity of these light sources, it often takes a long time to react completely.

Method used

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  • Method for producing metallic nanomaterials through femtosecond lasers
  • Method for producing metallic nanomaterials through femtosecond lasers
  • Method for producing metallic nanomaterials through femtosecond lasers

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Such as figure 1 As shown, the laser used is Coherent's Legend Elite femtosecond laser. Adjust the laser so that the optical path of the laser is aligned with the incident surface of the sample groove. A lens is used to focus the light, and the focal point is located in the center of the interior of the sample well. Then adjust the power of the laser to 20mW, and add the prepared 10mmol / L silver nitrate aqueous solution into the sample tank, and then irradiate after standing for 5min. After irradiating for 600s, the samples were tested. AgNO 3 Nanoparticles formed after laser irradiation, such as figure 2 shown.

Embodiment 2

[0024] Replace silver nitrate with silver acetate, and other conditions are with embodiment 1.

Embodiment 3

[0026] Debug the laser, remove the lens, and align the laser spot with the incident surface of the sample groove. Then adjust the power of the laser to 400mW, and add the prepared 1mmol / L chloroauric acid solution into the sample tank, and then irradiate after standing for 5min. After irradiating for 1 s, the samples were tested. Nanorods formed by chloroauric acid after laser irradiation, such as image 3 shown. After 2 min of irradiation, the samples were tested. The hexagonal nanosheets formed after the chloroauric acid solution is irradiated by laser, such as Figure 4 shown.

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Abstract

The invention discloses a method for producing metallic nanomaterials through femtosecond lasers. According to the method, the lasers are used for directly irradiating metallic salt solution, thus obtaining the metallic nanomaterials with different shapes, wherein the time for laser irradiation is 1-3600 seconds, the average power of the incoming lasers is 5mW-400mW, and the concentration of the metallic salt solution is 1m mol/L-1mol/L. The method is simple and convenient, and does not need any reducing agent or surface active agent; and moreover, reaction conditions are simple and easy to control and are environment-friendly. The shapes and sizes of the produced metallic nanomaterials can be controlled, and the produced metallic nanomaterials can be applied to the fields of catalysis, electrochemistry, surface raman reinforcement or biomedicines and the like.

Description

technical field [0001] The invention relates to the technical field of metal nanomaterials, in particular to a method for preparing metal nanomaterials with a femtosecond laser. Background technique [0002] With the development in recent decades, nanoscience has become one of the hot research fields today. Metal nanoparticles have become the focus of nanoscience research due to their unique properties such as surface effects, small size effects, and macroscopic quantum tunneling effects. Corresponding metal nanomaterials have been applied in many fields such as biosensing, catalysis, electronics industry, and optics. At present, there are many methods for preparing metal nanomaterials, such as gas phase method, chemical precipitation method, sol-gel method, chemical reduction method, thermal degradation method, photoreduction method and so on. The principle of the photoreduction method is that some metals have the property of surface plasmon resonance, which can absorb li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 袭锴王远王力蒋天行詹鹏樊亚仙贾叙东
Owner NANJING UNIV
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