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Hierarchical tin oxide nanosheet/silicon carbide nanofiber and preparation method thereof

A nano-carbon fiber and nano-fiber technology, applied in fiber processing, fiber chemical characteristics, rayon chemical post-treatment, etc., can solve the problems of small specific surface area of ​​particles and SiC substrates, no three-dimensional hierarchical structure, and performance needs to be further improved. , to achieve the effect of convenient large-scale production, excellent gas-sensing performance and huge application potential

Active Publication Date: 2015-08-19
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

But the SnO they got 2 The specific surface area of ​​particles and SiC substrate is small, and SnO 2 There is no three-dimensional hierarchical structure with SiC, and there are few exposed active sites, so the performance needs to be further improved

Method used

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  • Hierarchical tin oxide nanosheet/silicon carbide nanofiber and preparation method thereof
  • Hierarchical tin oxide nanosheet/silicon carbide nanofiber and preparation method thereof
  • Hierarchical tin oxide nanosheet/silicon carbide nanofiber and preparation method thereof

Examples

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reference example 1

[0037] 1) Prepare spinning solution: add polyacrylonitrile powder to dimethylformamide (DMF), the mass ratio of polyacrylonitrile powder to DMF is 1.2:10 (that is, the mass concentration of polyacrylonitrile is 10.7wt%), Stir to completely dissolve the polyacrylonitrile to obtain a homogeneous spinning solution;

[0038] 2) Electrospinning: The homogeneous spinning solution obtained in step 1) is subjected to electrospinning. The nozzle used for electrospinning is a metal needle with an inner diameter of 0.8mm, the spinning voltage is 16kV, the receiving distance is 20cm, and the feeding rate is 10 μL / min, spinning temperature 20°C, air relative humidity 60RH%, using a flat aluminum foil receiver to prepare nano-polyacrylonitrile fibrils;

[0039] 3) Pre-oxidation crosslinking: place the nano-polyacrylonitrile fibrils obtained in step 2) in an oxidation furnace, raise the temperature to 280°C at a rate of 5°C / min, keep it warm for 1h, and cool to room temperature to obtain inf...

reference example 2

[0044] As in reference example 1, the only difference is: in step 3), the temperature of the heat preservation is 260°C; in step 5), the temperature after heating is 1500°C, the heat preservation time is 2 hours, and the protective gas is high-purity argon.

[0045] The average diameter of the obtained porous nano-silicon carbide fibers is 200 nm, the diameter is uniform, the fibers are porous structure, and the specific surface area is 24.6 m 2 / g.

reference example 3

[0047] As in reference example 1, the only difference is that in step 5), the temperature after heating is 1400°C, the holding time is 5 hours, and the protective gas is high-purity argon.

[0048] The average diameter of the obtained porous nano-silicon carbide fibers is 200 nm, the diameter is uniform, the fibers are porous structure, and the specific surface area is 19.6 m 2 / g.

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Abstract

The invention relates to a hierarchical tin oxide nanosheet / silicon carbide nanofiber and a preparation method thereof. The hierarchical tin oxide nanosheet / silicon carbide nanofiber is prepared by using a method comprising the following steps: (1) adding SnCl2 2H2O, urea and concentrated hydrochloric acid in mercaptoacetic acid aqueous solution to obtain tin-containing hydrothermal reaction solution; (2) adding porous silicon carbide nanofiber into the tin-containing hydrothermal reaction solution, sealing the mixture, placing the mixture at 100-200 DEG C, preserving heat for 4-36h, and cooling to room temperature to obtain tin oxide nanosheet / silicon carbide nanofiber; (3) performing cleaning and drying, increasing the temperature to 500-900 DEG C, preserving heat for 1-5 hours, and cooling to room temperature to obtain the hierarchical tin oxide nanosheet / silicon carbide nanofiber. The tin oxide nanosheet / silicon carbide nanofiber provided by the invention has a three-dimensional hierarchical structure, the specific surface area is large, the size of SnO2 can be adjusted and controlled through synthesis conditions, and the application potential in fields such as gas sensors and light emitting diodes is huge.

Description

technical field [0001] The invention relates to a tin oxide nanosheet / silicon carbide nanofiber and a preparation method, in particular to a tin oxide nanosheet / silicon carbide nanofiber with a hierarchical structure and a preparation method. Background technique [0002] In recent years, with the increasing development of microelectronics technology and precision machining technology, microelectromechanical systems (MEMS) based on single crystal Si microelectromechanical processing technology have also attracted more and more attention. MEMS are widely used in fields such as engines, aerospace vehicles, nuclear power equipment, satellites, space exploration, geothermal wells and sensors. However, due to the low band gap of Si (Eg=1.12eV), its elastic modulus will be greatly reduced above 600°C, and the p-n junction based on Si semiconductor will be destroyed above 150°C. Therefore, the highest application of Si-based MEMS The temperature is only 200°C, which greatly limits...

Claims

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Application Information

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IPC IPC(8): D06M11/46D01F9/22D01F9/24D01F9/145D01F11/16
Inventor 王应德王兵
Owner NAT UNIV OF DEFENSE TECH
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