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Hexagonal boron nitride nanosheet and preparation method thereof

A technology of hexagonal boron nitride and nanosheets, applied in chemical instruments and methods, catalyst activation/preparation, nanotechnology, etc., can solve the problems of not using the properties of h-BN itself, high energy consumption, etc.

Active Publication Date: 2017-12-01
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, intercalation and exfoliation of h-BN to prepare BNNS requires the effective destruction of the "lip-lip interaction" and interlayer force at the edge of h-BN, and the existing exfoliation methods generally do not take advantage of the inherent properties of h-BN , the energy consumption is large, so the development of a simple, efficient and targeted h-BN stripping method is of great significance to promote the application of BNNS

Method used

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  • Hexagonal boron nitride nanosheet and preparation method thereof
  • Hexagonal boron nitride nanosheet and preparation method thereof
  • Hexagonal boron nitride nanosheet and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0040] 1) h-BN powder pretreatment

[0041] Weigh 2g of commercial h-BN powder into a 250mL round bottom flask, add 80mL of 10% nitric acid solution (65% nitric acid: water = 1:5.5 (v / v)) to it, and put a stirring magnet. Place the round-bottomed flask in an oil bath, start magnetic stirring, heat to 80°C, keep it for 5h, then cool to room temperature naturally. The dispersion was placed in a high-speed centrifuge (HC-2518), and the BN particles were centrifuged at a speed of 8000 rpm, and rinsed with deionized water until the washing liquid was neutral. The treated product was dried in a 50°C electric blast oven (GZX-9070MBE) for 24h. FT-IR spectra of BN powder before and after pretreatment as figure 1 as shown, figure 1 It is the infrared spectrum of h-BN before and after nitric acid treatment in the embodiment of the present invention 1, by figure 1 It can be seen that there is basically no difference between the two, 1395cm -1 The absorption peak is attributed to the ...

Embodiment 2

[0046] 1) See Example 1 for the pretreatment of h-BN powder.

[0047] 2) Radiation stripping of BNNS

[0048] Weigh 20 mg of h-BN powder treated with nitric acid, and ultrasonically disperse it in 42.5 mL of deionized water. Add 7.5mL of isopropanol (IPA) and 1.188g of nickel chloride hexahydrate into the h-BN dispersion in sequence, and put in a stirring magnet. The round bottom flask was placed in a constant temperature heating magnetic stirrer (DF-101K), heated to 70°C and kept for 3d. After heating, measure 25mL of the above dispersion liquid into the dropping funnel, drop it into a flask filled with 25mL of 8g / L CTAC aqueous solution, and disperse evenly by ultrasonic. Then put into the stirring magnet, seal with Parafilm sealing film after passing nitrogen for 10min, and fix the flask in the cobalt source chamber with an iron stand, irradiate for 48h under magnetic stirring, and the absorbed dose rate is 92.1Gy / min (ferrous sulfate dose meter calibration), the total a...

Embodiment 3

[0051]Weigh 20 mg of commercial h-BN powder, and ultrasonically disperse it in 42.5 mL of deionized water. Add 7.5mL of isopropanol (IPA) and 1.188g of nickel chloride hexahydrate into the h-BN dispersion in sequence, and put in a stirring magnet. The round bottom flask was placed in a constant temperature heating magnetic stirrer (DF-101K), heated to 70°C and kept for 3d. After heating, measure 25mL of the above dispersion liquid into the dropping funnel, drop it into a flask filled with 25mL 8g / L cetyltrimethylammonium chloride (CTAC) aqueous solution, and disperse evenly by ultrasonic. Then put into the stirring magnet, seal with Parafilm sealing film after passing nitrogen for 10min, and fix the flask in the cobalt source chamber with an iron stand, and irradiate for 48h under magnetic stirring, and the absorbed dose rate is 91.1Gy / min (ferrous sulfate dose meter calibration), the total absorbed dose was 262.4kGy. After the irradiation is over, put the dispersion in a hi...

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Abstract

The invention provides a hexagonal boron nitride nanosheet. The hexagonal boron nitride nanosheet is prepared from the hexagonal boron nitride nanosheet and transition metal nanoparticles loaded on the hexagonal boron nitride nanosheet. The invention also provides a preparation method of the hexagonal boron nitride nanosheet. By combining a transition metal ion coordination intercalation technology and a radiation reduction synthesis metal nanoparticle technology, BNNS loaded with metal nanoparticles is obtained by delaminating from an h-BN nanoparticle, which provides a new method for the preparation and functionalization of the BNNS. Compared with the existing delamination method, the new method has the characteristics of mild conditions, easy operation, environment friendliness and high efficiency and energy saving. Experimental results show that the method provided by the invention can obtain hexagonal boron nitride nanosheets with thickness of 1.5-3.0 nm.

Description

technical field [0001] The invention belongs to the technical field of hexagonal boron nitride, and in particular relates to a hexagonal boron nitride nanosheet and a preparation method thereof. Background technique [0002] Hexagonal boron nitride nanosheets (BNNS) are the isoelectronics of graphene, which have a layered structure similar to graphene, and are called "white graphene". It has some unique properties, such as no absorption in the visible wavelength range, more suitable for making optical devices; good thermal conductivity (thermal conductivity is 1700-3000W m -1 ·K -1 ); good insulation (bandgap width of 5.2-5.8eV); high thermal stability (its decomposition temperature is above 900°C, while carbon materials usually start to decompose above 450°C); excellent radiation resistance, etc. (Luo W ,Wang Y,Hitz E,Lin Y,Yang B,Hu L.Advanced Functional Materials,2017 1701450; Meziani MJ,Song WL,Wang P,Lu F,Hou Z,Anderson A,Maimaiti H,Sun YP.Chemphyschem,2015, 16(7), 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J31/18B01J37/34B01J37/04B82Y30/00B82Y40/00
CPCB01J27/24B01J31/1805B01J37/0072B01J37/04B01J37/344B82Y30/00B82Y40/00
Inventor 汪谟贞姜志文葛学武
Owner UNIV OF SCI & TECH OF CHINA
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