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Preparing method for controllably synthesizing monodisperse active metal nanoparticles through lasers

An active metal and nanoparticle technology, applied in the field of preparation of active metal nanoparticles, can solve the problems of difficulty in synthesizing monodisperse active metal nanoparticles, unable to realize size regulation of active metal nanoparticles, etc., achieving easy control, good dispersibility, Effects without by-products and impurities

Active Publication Date: 2014-09-03
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing preparation process is difficult to synthesize monodisperse active metal nanoparticles and cannot realize the size regulation of active metal nanoparticles. The rapid green synthesis of the laser ablation process and the parallel laser irradiation process can uniformly It provides a method for the controllable synthesis of monodisperse active nanoparticles in the liquid phase using nanosecond laser ablation and parallel laser irradiation.

Method used

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  • Preparing method for controllably synthesizing monodisperse active metal nanoparticles through lasers
  • Preparing method for controllably synthesizing monodisperse active metal nanoparticles through lasers
  • Preparing method for controllably synthesizing monodisperse active metal nanoparticles through lasers

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Embodiment 1

[0026] (1) Using a cadmium target with a purity of 99.999% and a thickness of 5mm as a raw material, sand the surface of the target to remove its oxide layer; place the metal target in distilled water for ultrasonic cleaning for 2 minutes, and then place it in cyclohexane Ultrasonic cleaning for 2 minutes; repeat three times and then air dry naturally to dry the surface of the target.

[0027] (2) if figure 1 As shown in (a), the cadmium target is placed in 20 mL of oleic acid ethanol solution, the volume percentage of oleic acid is 0.1%, the distance between the liquid surface and the upper surface of the cadmium target is 5 mm, and a nanosecond pulse laser with a wavelength of 1064 nm is used to focus on On the upper surface of the target, the laser energy density is about 120mJ / cm 2 , repetition frequency 5Hz; the whole process is protected by an argon flow with a flow rate of 60sccm to prevent the oxidation of cadmium and to remove oxygen; and it needs to be supplemented ...

Embodiment 2

[0034] With respect to embodiment 1, in the step (3), the laser energy parameter is changed into 250mJ, and all the other conditions are constant, and the corresponding characterization of the monodisperse cadmium nanoparticles obtained is as follows Figure 4 (a) ~ (c) shown. from Figure 4 (a) It can be seen that the prepared particles have good dispersion and uniform size, Figure 4 (b) reflects the good crystallinity of a single particle, Figure 4 (c) According to particle size statistics, the size of the product obtained by parallel pulsed laser irradiation at 250mJ energy is 13.6±1.0nm, and the size distribution is 7.3%, which also meets the requirement of monodisperse size distribution of less than 10%.

Embodiment 3

[0036] With respect to embodiment 1, in step (3), laser energy parameter is changed into 300mJ, and all the other conditions are constant, and the corresponding characterization of the monodisperse cadmium nanoparticle that obtains is as follows Figure 5 (a)~(c), from Figure 5 (a) It can be seen that the prepared particles have good dispersion and uniform size, Figure 5 (b) reflects the good crystallinity of a single particle, Figure 5 (c) According to particle size statistics, the size of the product obtained by parallel pulsed laser irradiation at 300mJ energy is 10.1±1.0nm, and the size distribution is 9.9%, which also meets the requirement of monodisperse size distribution of less than 10%.

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Abstract

The invention discloses a preparing method for controllably synthesizing monodisperse active metal nanoparticles through lasers. The method comprises the steps that pure-metal target materials serve as raw materials, the processed target materials are placed into a laser radiating device, the laser radiating device is inflated with argon, cyclohexane and oleic acid are added into the laser radiating device, and then the volume solubility of the oleic acid is larger than 0.05 percent but smaller than 0.12 percent; the target materials are ablated through a nanosecond focus pulse laser to prepare a pure-metal nanometer colloid solution; the colloid solution is transferred to the other laser radiating device, and the volume concentration of the oleic acid in the cyclohexane is adjusted to range from 0.14 percent to 0.17 percent; a nanosecond parallel pulse laser is utilized for irradiating the metal nanometer colloid solution to prepare the monodisperse active metal nanoparticles with the diameter ranging from 5 nm to 20 nm. According to the preparing method, the active metal nanoparticles uniformed in appearance under the normal-temperature and normal-pressure liquid phase condition are controllably synthesized, and the size distribution of the active nanometer particles is smaller than 10 percent. The method is simple in technology, convenient to operate, free of by-products and impurities and suitable for synthesizing most active metal nanometer particles, and is an environmental-friendly synthesizing technology.

Description

technical field [0001] The present invention relates to metal nanoparticles, in particular to a method for preparing monodisperse active metal nanoparticles synthesized by laser method with controllable size. Background technique [0002] Active metal nanoparticles have the unique surface effect and quantum size effect of nanomaterials, and their properties are different from traditional bulk metals. They have great potential in the fields of catalysis, photoelectric conduction, information storage, and magnetic fluid, and have unique application values ​​and broad fields. Application prospect. For example, magnetic nanoparticles such as iron, cobalt, and nickel have been widely used in biomedical aspects such as targeted drug carriers, magnetic hyperthermia, immunoassay, and radioimmunolabeling, see Pankhurst Q A, Connolly J, Jones S K, et al.Applications of magnetic nanoparticles in biomedicine [J]. Journal of physics D: Applied physics, 2003, 36(13): R167. At the same t...

Claims

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Application Information

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IPC IPC(8): B22F9/06
Inventor 杨静罗瑞春杜希文
Owner TIANJIN UNIV
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