Synthetic method of sodium niobate nanowire

A synthesis method and technology of sodium niobate, applied in niobium compounds, nanotechnology, nanotechnology and other directions, can solve the problems of high energy consumption, low production efficiency, unfavorable industrialization, etc., achieve low energy consumption, improve production efficiency, and be easy to operate. and control effects

Active Publication Date: 2014-09-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Xu first prepared K2Nb8O21 nanowire templates by the molten salt method, and then performed ion exchange under molten salt conditions to obtain Sodium niobate nanowires, the process is cumbersome, consumes a lot of energy, and has certain dangers; [C. Y. Xu, L. Zhen, R. Yang, Z. L. Wang, J. Am. Chem. Soc., 2007, 129, 15444–15445.] Electrospinning can prepare sodium niobate nanowires with uniform size and controllable size, but it needs to rely on expensive equipment, and the production efficiency is extremely low, which is not conducive to industrialization; [W . Zeng, X. M. Tao, S. Chen, S. M. Shang, H. L. W. Chan, S. H. Choy, Energy Environ. Sci., 2013, 6, 2631-2638.] Currently, the hydrothermal The post-annealing treatment prepares sodium niobate nanowires, that is, the one-dimensional intermediate product Na7(H 3O)Nb6O19.14H2O or Na2Nb2O6, and then post-annealing to obtain sodium niobate nanowires
[J. H. Jung, C. Y. Chen, W. W. Wu, J. I. Hong, B. K. Yun, Y. S. Zhou, N. Lee, W. Jo, L. J. Chen, L. J. Chou, Z. L. Wang, J. Phys. Chem. C, 2012, 116 (42), 22261–22265.] The preparation of sodium niobate nanowires by the hydrothermal method has obvious advantages over the molten salt method, but the one-dimensional intermediate product is very sensitive to the reaction environment, and the reaction conditions need to be precisely controlled. It also needs later calcination treatment, which consumes a lot of energy and the process is more complicated.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0029] Add 1.6664g NaOH to 50ml ethylene glycol solvent, heat and stir for 20~30min; after it is fully mixed, continue to add 1.5g raw material Nb 2 O 5 , heating and stirring for 15~20min to make it evenly mixed to form a milky white mixed solution. The obtained mixed solution was transferred to a polytetrafluoroethylene lining, and then the lining was placed in a stainless steel hydrothermal reaction kettle to be sealed, and the heat preservation reaction was carried out at 140° C. for 8 h, and after the reaction was completed, it was naturally cooled to room temperature. The obtained white precipitated product was washed and centrifuged multiple times with deionized water and anhydrous ethanol. The rotating speed was 3000 rpm and the time was 10 min to ensure that all residual ions and organic solvents were washed away; drying treatment was carried out at 60 °C for 24 h. , to obtain sodium niobate (NaNbO 3 ) nanowire powder.

Embodiment 2

[0031] Add 1.6664g NaOH to 50ml ethylene glycol solvent, heat and stir for 20~30min; after it is fully mixed, continue to add 1.0g raw material Nb 2 O 5, heating and stirring for 15~20min to make it evenly mixed to form a milky white mixed solution. The obtained mixed solution was transferred to a polytetrafluoroethylene liner, and then the liner was placed in a stainless steel hydrothermal reactor to seal, and the reaction was kept at 180° C. for 8 hours, and cooled to room temperature naturally after the reaction was completed. The obtained white precipitated product was washed and centrifuged multiple times with deionized water and absolute ethanol, and the rotation speed was 3000 rpm and the time was 10 min to ensure that all residual ions and organic solvents were washed away; 24h drying treatment to obtain sodium niobate (NaNbO 3 ) nanowire powder.

Embodiment 3

[0033] Add 3.3328g NaOH to 50ml ethylene glycol solvent, heat and stir for 20~30min; after it is fully mixed, continue to add 0.5g raw material Nb 2 O 5 , heating and stirring for 15~20min to make it evenly mixed to form a milky white mixed solution. The obtained mixed solution was transferred to a polytetrafluoroethylene lining, and then the lining was placed in a stainless steel hydrothermal reactor to seal, and the reaction was kept at 200° C. for 4 h, and cooled to room temperature after the reaction was completed. The obtained white precipitated product was washed and centrifuged multiple times with deionized water and absolute ethanol, and the rotation speed was 3000 rpm and the time was 10 min to ensure that all residual ions and organic solvents were washed away; After 24h drying treatment, sodium niobate (NaNbO3) nanowire powder was obtained.

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Abstract

The invention discloses a synthetic method of a sodium niobate nanowire. The synthetic method comprises the following steps: mixing NaOH and an organic solvent, carrying out hydro-thermal reaction, washing, centrifugally separating and drying. According to the synthetic method, used equipment is simple, reaction conditions are mild, the preparation of an intermediate phase precursor and the later annealing treatment are not needed, reaction raw materials are low in price, and expensive surface active agents are not need to be used as templates. The synthetic method has the main characteristics of simple technological process, capability of saving energy sources, low cost, easy control and operation, good repeatability and the like and can be put into industrial production easily, is capable of effectively shortening synthetic time and improving production efficiency and is an ideal environment-friendly synthetic technology.

Description

[0001] technical field [0002] The invention relates to a solvothermal synthesis method of sodium niobate nanowires, in particular to a method for repeatedly synthesizing sodium niobate nanowires in one step, and belongs to the field of alkali metal niobate nanometer functional materials. Background technique [0003] Sodium niobate is an important inorganic non-metallic functional material with a typical perovskite structure, because of its good nonlinear optics, ferroelectricity, piezoelectricity, photocatalysis and pyroelectricity, etc. , has great application potential in the fields of energy recovery, smart sensing, energy conversion, and photocatalysis, and has attracted great attention in the fields of scientific research and technical applications. [W. Zeng, X. M. Tao, S. Chen, S. M. Shang, H. L. W. Chan, S. H. Choy, Energy Environment. Sci., 2013, 6, 2631-2638; M. Blomqvist, S. Khartsev, A. Grishin, A. Petraru, C. Buchal, Appl. Phys. Lett., 2003, 82, 439.] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00B82Y30/00B82Y40/00
Inventor 朱孔军古其林刘劲松王婧裘进浩刘鹏程
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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