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Preparation method for boron nitride nanosheet/metal nanoparticle composite

A technology for metal nanoparticles and composite materials, applied in the field of preparing boron nitride nanosheets/metal nanoparticle composite materials, can solve the problems of reducing the bonding interface activity of composite materials, uneven distribution of metal nanoparticles, inconsistent particle size, etc. Significant surface Raman enhancement effect, green synthesis method, uniform and adjustable particle size

Active Publication Date: 2017-04-26
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are few literature reports on boron nitride nanosheet / metal nanoparticle composite materials and their preparation methods, and most of them need to use electrochemical deposition and chemical reduction methods. The manufacturing process is cumbersome, which is not conducive to large-scale industrial mass production.
Moreover, the reducing agent and organic solvent used in the chemical reduction method will reduce the activity of the bonding interface between the composite materials, thereby reducing its performance and affecting the application of composite materials in many aspects
In addition, most of the metal nanoparticles loaded in the prepared composite materials are unevenly distributed and have inconsistent particle sizes.

Method used

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  • Preparation method for boron nitride nanosheet/metal nanoparticle composite
  • Preparation method for boron nitride nanosheet/metal nanoparticle composite
  • Preparation method for boron nitride nanosheet/metal nanoparticle composite

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Example 1: Preparation of PS-P2VP reverse micelles loaded with gold chlorate and formation of gold nanoparticles.

[0045] Weigh 50 mg of PS-P2VP with a chain length of 185,000-90,000, disperse it in 10 ml of toluene, stir it magnetically at room temperature for 3 to 7 days, and dissolve it completely to form a PS-P2VP toluene solution with a concentration of 5 mg / ml. Weigh 26 mg of gold chlorate, disperse it in the PS-P2VP toluene solution, and continue magnetic stirring at room temperature for 1 to 3 weeks to form a reverse micellar solution of PS-P2VP loaded with gold chlorate.

[0046] The toluene can also be other solvents with different solubility for PS and P2VP.

[0047] At this point, it was pulled out at a speed of 14mm / min and attached to a silicon substrate. The scanning electron micrograph (SEM) of the morphology of these gold-loaded reverse micellar particles is shown in figure 1 . It can be clearly seen from the SEM pictures that the gold-loaded reverse...

Embodiment 2

[0049] Example 2: Changing the chain length of PS-P2VP can also obtain a gold-loaded reverse micellar solution.

[0050] Change the chain length of PS-P2VP among the embodiment 1 to be 32500-7800, be dispersed in 10 milliliters of toluene solutions, other is the same as embodiment 1, also can obtain the reverse micelle solution of loaded gold.

Embodiment 3

[0051] Example 3: Preparation of boron nitride nanosheets.

[0052] Weigh 1 gram of boron nitride powder and 6 grams of potassium permanganate (mass ratio 1:6), grind and mix thoroughly, then add 135 milliliters of concentrated sulfuric acid and phosphoric acid (volume ratio 8:1) in the mixed reaction solvent, at 75 ° C After 12 hours of reaction, add 138 ml of refrigerated hydrogen peroxide and deionized water (volume ratio: 3:20), and continue magnetic stirring for 2 hours in an ice-water bath. After completion, use a centrifuge to screen and clean the samples by differential centrifugation. After drying, boron nitride nanosheets with good dispersion and good quality of several to a dozen layers can be obtained. The differential centrifugation method is to centrifuge at 4000rpm for 10-30 minutes, take the supernatant, then centrifuge at 17000rpm for 10-30 minutes, and take the supernatant. Scanning electron microscopy (SEM) of boron nitride nanosheet products see image 3 ...

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Abstract

The method provides a preparation method for a boron nitride nanosheet / metal nanoparticle composite. The preparation method comprises the specific steps that (1), metal nanoparticles are self-assembled through an amphiphilic segmented copolymer; (2) the boron nitride nanosheet is prepared through a chemical stripping method; and (3) the boron nitride nanosheet / metal nanoparticle composite are synthesized in one step. The preparation method is characterized in that the segmented copolymer self-assembling method is adopted, a large area of the metal nanoparticles with the two-dimensional extension cycle and the adjustable size and interval is synthesized on the surface of the boron nitride nanosheet by adjusting the self-assembling parameters; and the prepared boron nitride nanosheet / metal nanoparticle composite is very stable, has the very high Raman enhancement effect and the photoelectric property and has the good application prospects on the aspects of functional materials, sensors, biomedical sciences and the like. The preparation process is simple and free of using a reducing agent, and the large-scale industrial production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a method for preparing a boron nitride nanosheet / metal nanoparticle composite material. Background technique [0002] Similar to graphene, the two-dimensional layered nanosheet structure of hexagonal boron nitride has unique physical and chemical properties (even better than graphene in some aspects), such as wide band gap, high temperature oxidation resistance, and high chemical stability. , high corrosion resistance, high thermal conductivity, low thermal expansion coefficient, low dielectric constant and thermal shock resistance, etc., have huge potential application prospects in optoelectronic devices, functional materials, transistors, supercapacitors / batteries, sensing and testing, etc. . Metal nanoparticles, especially those with a size below 10 nanometers, exhibit quantum size effects, quantum confinement effects, surface effects, etc., which have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/07B22F1/054
Inventor 殷红赵艳高伟
Owner JILIN UNIV