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Method for preparing high-purity high-density WO3/S core-shell structure nano-particles

A technology of core-shell structure and nanoparticles, which is applied in the field of preparation of high-purity and high-density WO3/S core-shell structure nanoparticles, to achieve the effects of controllable thickness, uniform and controllable particle size, and large output

Inactive Publication Date: 2013-12-25
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, WO 3 / TiO 2 The core-shell structure is due to the combination of WO 3 and TiO 2 The excellent performance shows more excellent catalytic performance and more excellent electrochromic dyeing rate (Vuong N M, Kim D, Kim H. Electrochromic properties of porous WO 3 -TiO 2 core-shell nanowires.J.Mater.Chem.C, 2013, 1(21):3399-3407), and about WO 3 / S core-shell structure has not been reported yet

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  • Method for preparing high-purity high-density WO3/S core-shell structure nano-particles
  • Method for preparing high-purity high-density WO3/S core-shell structure nano-particles

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preparation example Construction

[0021] The present invention proposes a high-purity high-density WO 3 / S The preparation method of core-shell structure nanoparticles is characterized in that, the method adopts a vacuum tube furnace, and tungsten oxide (WO 3 ) and sulfur (S) as evaporation sources, through thermal evaporation method, under the protection of carrier gas, one-step synthetic deposition on flat and smooth silicon wafers, gallium arsenide wafers, sapphire wafers or silicon carbide single wafers to obtain high Density of WO 3 / S core-shell structure nanoparticles, and include the following steps and contents:

[0022] (1) The evaporation source used is commercially available analytically pure WO 3 powder and sulfur powder.

[0023] (2) The substrate used is one of silicon wafers, gallium arsenide wafers, sapphire wafers, and silicon carbide single wafers, with a smooth surface and good finish.

[0024] (3) In the vacuum tube furnace, there will be respectively equipped with WO 3 Alumina cerami...

Embodiment 1

[0032] Embodiment 1: will house 0.2g analytically pure WO 3 The powdered alumina ceramic crucible is placed in the central heating zone of the vacuum tube furnace, and a WO 3 An alumina ceramic crucible with 0.01g of analytically pure S powder is placed at 14mm from the crucible of the powder, and a WO 3 A silicon wafer is placed at 22 mm from the crucible of the powder.

[0033] Before heating, vacuumize the whole system first, then pass high-purity argon into the system, and repeat 2 times to remove the air in the system. Then the temperature was raised to 950°C at a rate of 15°C / min and kept for 3 hours. During the heating process, keep the carrier gas flow rate at 300 standard cubic centimeters per minute (sccm), and finally cool down to room temperature naturally, and a large amount of WO can be obtained on the substrate. 3 / S core-shell nanoparticles.

[0034] The synthesized particles have uniform particle size, high density and large output (see figure 1 ). The cor...

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Abstract

The invention relates to a method for preparing high-purity high-density WO3 / S core-shell structure nano-particles, and belongs to the technical field of material preparation. The high-density WO3 / S core-shell structure nano-particles can be prepared by one-step synthetic deposition on a silicon chip, a gallium arsenide chip, a sapphire chip or a silicon carbide chip with flat and smooth surface in the protection of a carrier gas by virtue of a thermal evaporation method by adopting a vacuum tubular furnace and taking tungsten oxide and sulfur powder as evaporation sources, wherein the core is single-crystal WO3, and the shell is amorphous simple substance S. The method has the advantages of strict and controllable deposition condition, simple equipment and process, high yield, low cost and the like. The product with a nano-structure has high purity, the diameters of the core and the shell are uniformly distributed, and the particle size is controllable; the nano-particles have a wide application prospect in piezoresistors, gas sensors, catalysts and other fields.

Description

technical field [0001] The invention relates to a high-purity high-density WO 3 The invention discloses a method for preparing nanoparticles with a core-shell structure, belonging to the technical field of material preparation. Background technique [0002] As a functional ceramic, tungsten oxide has broad application prospects in electrochromism, gas detection and chemical catalysis. At the same time, as a varistor, tungsten oxide ceramics have the characteristics of low voltage and low current, and are expected to be applied in the field of microelectronics. However, due to the existence of multiphase coexistence in tungsten oxide crystals, its electrical properties are unstable, and its application potential is far from being fully developed. Studies have shown that when the size of the material is as small as nanometers, most of them are in a single crystal state. Therefore, the preparation of tungsten oxide nano single crystals is expected to solve its shortcomings su...

Claims

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Application Information

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IPC IPC(8): C23C14/06C30B23/00B82Y40/00
Inventor 钱静雯彭志坚符秀丽王成彪付志强岳文
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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