Method for synthesizing beta-SiC nano-wire

A synthesis method and nanowire technology, which is applied in the field of synthesis of β-SiC nanowires, can solve the problems of high cost and low purity of β-SiC nanowires, and achieve the effects of high surface activity, high specific surface area, and wide sources

Inactive Publication Date: 2008-11-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of high cost and low purity in the preparation of ...

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  • Method for synthesizing beta-SiC nano-wire
  • Method for synthesizing beta-SiC nano-wire

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Experimental program
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Embodiment 1

[0013] Embodiment 1: the present embodiment adopts pine wood as biological activated carbon raw material

[0014] 1) Preparation of bioactivated carbon flakes: first process pine wood into flakes with a thickness of 1mm, wash the flakes with water, and dry them in a blast drying oven at a drying temperature of 70°C for 24 hours, and then The dried flakes were carbonized at 900°C, the heating rate was 60°C / h, and kept for 10 hours to obtain biological activated carbon flakes;

[0015] 2) Preparation of reaction powder: mix diatomaceous earth and silicon powder at a mass ratio of 1:1, and ball mill;

[0016] 3) Preparation of β-SiC nanowires: place the reaction powder in a corundum crucible or a graphite crucible, insert a bioactive carbon sheet into the crucible, cover the crucible mouth with carbon felt, put the crucible into a vacuum sintering furnace and heat up to 1400°C, heat preservation for 1 hour, control the furnace pressure below 100Pa, take out the bio-activated car...

Embodiment 2

[0017] Embodiment 2: the present embodiment adopts pine wood as biological activated carbon raw material

[0018] 1) Preparation of biological activated carbon flakes: first process pine wood into flakes with a thickness of 3mm, wash the flakes with water, and dry them in a blast drying oven at a drying temperature of 70°C for 24 hours, and then The dried flakes are carbonized at 1000°C, the heating rate is 30°C / h, and the heat preservation is 8 hours to obtain biological activated carbon flakes;

[0019] 2) Preparation of reaction powder: mix diatomaceous earth and silicon powder at a mass ratio of 1:1.3, and ball mill;

[0020] 3) Preparation of β-SiC nanowires: place the reaction powder in a corundum crucible or a graphite crucible, insert a bioactive carbon sheet into the crucible, cover the crucible mouth with carbon felt, put the crucible into a vacuum sintering furnace and heat up to 1300°C, heat preservation for 1.5 hours, control the furnace pressure below 100Pa, tak...

Embodiment 3

[0021] Embodiment 3: present embodiment adopts moso bamboo as biological activated carbon raw material

[0022] 1) Preparation of biological activated carbon flakes: first process the moso bamboo into flakes with a thickness of 2mm, wash the flakes with water, and dry them in a blast drying oven at a drying temperature of 70°C for 24 hours, and then The dried flakes were carbonized at 930°C, the heating rate was 50°C / h, and they were kept for 9.5 hours to obtain biological activated carbon flakes;

[0023] 2) Preparation of reaction powder: mix diatomaceous earth and silicon powder at a mass ratio of 1:1.5, and ball mill;

[0024] 3) Preparation of β-SiC nanowires: place the reaction powder in a corundum crucible or a graphite crucible, insert a bioactive carbon sheet into the crucible, cover the crucible mouth with carbon felt, put the crucible into a vacuum sintering furnace and heat up to 1200°C, keep warm for 2 hours, control the furnace pressure below 100Pa, take out the...

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Abstract

The invention relates to a method for synthesizing a beta-SiC nanometer line. The beta-SiC nanometer line is formed on the surface of a biological activated carbon sheet through carbothermic reduction reaction at 1,200-1,400 DEG C with SiO produced by the reaction of diatomite and silicon powder at a high temperature as a silicon source and the biological activated carbon sheet as a carbon source. The used biological activated carbon sheet can be obtained from bamboo, wood and other natural renewable plants by carbonization; and the raw materials are easily accessible and the cost is low. The biological activated carbon has high specific surface area and high surface activity, and can react with SiO at a relatively low temperature to obtain the beta-SiC nanometer line. The naturally existing metal ions in the biological activated carbon can be used as a catalyst to promote the growth of the beta-SiC nanometer line. The application of the biological activated carbon sheet can prevent formation of granular SiC, and provides favorable conditions for preparation of high-purity beta-SiC nanometer lines.

Description

technical field [0001] The invention relates to a method for synthesizing β-SiC nanowires. Background technique [0002] β-SiC nanowires have unique optical properties, good electric field emission properties, and excellent mechanical properties. They not only have great application potential in the field of optoelectronic materials, but also have broad application prospects in the field of composite materials as a reinforcing phase. [0003] At present, the carbothermal reduction method is one of the commonly used methods for the synthesis of β-SiC nanowires. The document "Hongjie Dai, Eric W.Wong, Yuan Z.Lu, Shoushan Fan, Charles M.Lieber, Synthesis and characterization of carbide nanorods, Nature, 375 (1995), 769-772" discloses a carbothermal reduction synthesis The method of β-SiC nanowires, which uses carbon nanotubes as a carbon source to react with gas-phase SiO to prepare high-purity β-SiC nanowires, but the cost of carbon nanotubes is too high to be suitable for th...

Claims

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Application Information

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IPC IPC(8): C01B31/36
Inventor 李翠艳黄剑锋曹丽云吴建鹏卢靖
Owner SHAANXI UNIV OF SCI & TECH
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