A method for preparing boron nitride nanosheets/metal nanoparticle composites
A technology of 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
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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 in Example 1 to 32500-7800, and disperse it in 10 ml of toluene solution. Others are the same as in Example 1, and a gold-loaded reverse micelle solution can also be obtained.
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, and then centrifuge at 17000rpm for 10-30 minutes to take the supernatant. Scanning electron microscopy (SEM) of boron nitride nanosheet products see Figure 4...
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