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Method for preparing BCNO light-emitting nanosheet

A technology of nanosheets and boric acid, which is applied in the field of preparation of multifunctional BCNO nanosheets, can solve the problems of environmental pollution, unfavorable green synthesis and industrial application of BCNO phosphors, poor controllability of urea combustion method, etc., and achieve the effect of broad application prospects

Active Publication Date: 2016-04-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far there is no report on the synthesis of BCNO nanosheets
In addition, most of the synthesis of BCNO uses urea as a nitrogen source, and the urea combustion method has the disadvantages of poor controllability and environmental pollution, which is not conducive to the green synthesis and industrial application of BCNO phosphors.
Our research group has previously used boric acid as the boron source, melamine as the nitrogen source, hexamethylenetetramine, and glucose as the carbon source to synthesize micron-scale BCNO phosphors emitting blue and green light, although it overcomes the shortcomings of the urea combustion method. , but the synthesized BCNO materials are all in particle shape, and the particle size is on the micron scale

Method used

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  • Method for preparing BCNO light-emitting nanosheet
  • Method for preparing BCNO light-emitting nanosheet
  • Method for preparing BCNO light-emitting nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Put 0.02 mole of boric acid and 0.04 mole of dicyandiamide into the oven for heating pretreatment respectively in proportion. The heating temperature is 120°C and the heating time is 5 hours. After the heating is completed, it is naturally cooled to room temperature; For boric acid: dicyandiamide = 1:2,

[0028] Step 2: Put the pretreated boric acid and dicyandiamide into the reactor immediately, then add 15ml of ethylene glycol, and stir at 50°C for 5 hours; then raise the temperature of the solution to 90°C, Evaporation of the diol solvent, the precursor of the BCNO nanosheet is gradually precipitated from the solvent, and the solution is evaporated to dryness to obtain the precursor of the BCNO nanosheet;

[0029] Step 3: Put the BCNO nanosheet precursor prepared in the previous step into a muffle furnace for sintering. The muffle furnace is raised to 625°C at a rate of 5°C per minute, and sintered at this temperature for 5 hours. After sintering, cool natur...

Embodiment 2

[0031] Other steps are the same as in Example 1, except that the volume of ethylene glycol in step 2 is changed from 15ml to 20ml.

Embodiment 3

[0033] Other steps are the same as in Example 1, except that the volume of ethylene glycol in step 2 is changed from 15ml to 25ml.

[0034] Test results: Different BCNO luminescent nanosheets were prepared by changing the volume of ethylene glycol. The BCNO luminescent nanosheets were measured by X-ray diffraction, scanning electron microscope, transmission electron microscope, infrared spectrum and emission spectrum. The test results are as follows: Figure 1-8 shown. figure 1 It is the X-ray diffraction pattern of BCNO nanosheets prepared when the ratio of boric acid and dicyandiamide is 1:2, and the amount of ethylene glycol is 20ml. The sample has two broad diffraction peaks near 26 degrees and 43 degrees. PDF card comparison (PDF#45-0895), shows that the structure of BCNO nanosheets is a staggered BN hexagonal structure. figure 2 It is the scanning electron microscope image of BCNO nanosheets prepared when boric acid: dicyandiamide = 1:2, and the amount of ethylene glyc...

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Abstract

The invention provides a method for preparing a BCNO light-emitting nanosheet. The method includes the following steps that firstly, boric acid and dicyandiamide are placed in an oven for heating pretreatment, heating temperature is 110-130 DEG C, heating time is 4-6 hours, and boric acid and dicyandiamide are naturally cooled to room temperature after being heated; secondly, boric acid and dicyandiamide subjected to heating pretreatment are immediately placed in a reactor, then ethylene glycol is added, solution temperature is raised after stirring to dry the solution by distillation, and a precursor of the BCNO nanosheet is obtained; thirdly, the precursor, prepared in the second step, of the BCNO nanosheet is sintered at the temperature of 600-700 DEG C, the temperature increase rate is 5 DEG C / min, sintering time is 4-6 hours, the precursor is naturally cooled to room temperature, and the BCNO light-emitting nanosheet is obtained. The BCNO light-emitting nanosheet synthesized through the method is free of toxin and pollution, the emitting range is a blue and green light wave band, and the BCNO light-emitting nanosheet can serve as fluorescein to be used in the fields such as cell labeling, cell imaging and biomedicine.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and more specifically relates to a preparation method of multifunctional BCNO (boron carbon nitrogen oxygen) nanosheets. Background technique [0002] Most of the current phosphor materials are based on rare earth elements (Eu 2+ 、Ce 3+ etc.) as an activator to emit light, not only expensive, the synthesis temperature is high (above 900 ° C), and a protective atmosphere (nitrogen or argon) or a reducing atmosphere (hydrogen) is required for sintering, and the toxicity of rare earth chlorides is high, serious polluted environment. BCNO is a non-REE-doped luminescent phosphor, which has attracted widespread attention because it does not require REEs as activators. BCNO phosphor has low preparation temperature (700-900°C), no need for protective atmosphere sintering (i.e. sintering in air), energy saving and environmental protection, wide excitation spectrum range (from ultraviolet t...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B35/14B82Y40/00
CPCB82Y40/00C01B35/146C09K11/65
Inventor 张兴华李应鑫于景景刘辉卢遵铭孟凡斌唐成春
Owner HEBEI UNIV OF TECH
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