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Preparation method of high-purity short-rod-like crystalline FeWO4/FeS core-shell nano structure

A nanostructured, highly crystalline technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., to achieve the effects of high product yield, high purity, and uniform diameter

Inactive Publication Date: 2014-01-08
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as carbon-coated iron tungstate particles prepared by thermochemical method at 800mA -1 Excellent high-current discharge capability and long-term cycle capability under current cycling (Chen Gong, Yu-Jun Bai, Jun Feng, Rui Tang, Yong-Xin Qi, Ning Lun and Run-Hua Fan. Enhanced electrochemical performance of FeWO 4 by coating nitrogen-doped carbon.ACS applied materials &interfaces, 2013, 5, 4209-4215), and about FeWO 4 / FeS core-shell nanorods have not been reported

Method used

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  • Preparation method of high-purity short-rod-like crystalline FeWO4/FeS core-shell nano structure
  • Preparation method of high-purity short-rod-like crystalline FeWO4/FeS core-shell nano structure
  • Preparation method of high-purity short-rod-like crystalline FeWO4/FeS core-shell nano structure

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preparation example Construction

[0023] The present invention proposes a high-purity, short rod-shaped crystalline FeWO 4 / The preparation method of FeS core-shell nanostructure is characterized in that the method synthesizes short rod-shaped FeWO on the substrate coated with iron film by thermally evaporating tungsten oxide and sulfur 4 / FeS core-shell nanostructure, and includes the following steps and content:

[0024] (1) The evaporation source used is commercially available analytically pure WO 3 powder and sulfur powder.

[0025] (2) Deposit a metal Fe film with a thickness of 5-50nm on a clean silicon wafer, gallium arsenide wafer or silicon carbide single wafer by magnetron sputtering coater or arc evaporation in advance.

[0026] (3) In the vacuum tube furnace, there will be respectively equipped with WO 3 Alumina ceramic crucibles of powder and S powder, or filled with WO 3 The alumina ceramic crucible mixed with S powder is placed in the heating area in the center of the furnace, and the WO 3...

Embodiment 1

[0035] Embodiment 1: will house 0.5g 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 Place a silicon wafer coated with a 5nm Fe film on the surface at 24 mm from the powder crucible.

[0036] 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 30°C / min and kept for 2 hours. During the heating process, keep the carrier gas flow rate at 300 standard cubic centimeters per minute (sccm), and the vacuum degree in the tube furnace at -0.05MPa, and finally cool down to room temperature naturally to obtain short rod-shaped FeWO on the substrate. 4 / FeS core-shell nanostructure.

[0037] The synthesized nanorods have h...

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Abstract

The invention relates to a preparation method of a high-purity short-rod-like crystalline FeWO4 / FeS core-shell nano structure, belonging to the technical field of material preparation. According to the method, a vacuum tube furnace is adopted, tungsten oxide and sulfur powder are used as evaporation sources, and a thermal evaporation method is adopted to prepare the short-rod-like crystalline FeWO4 / FeS core-shell nano structure on a substrate coated with an iron film under the protection of carrier gas, wherein the core is single crystal FeWO4, and the shell is single crystal FeS. The method has the advantages of strict and controllable synthesis and growth conditions, simple equipment and technique, high product yield, low cost and the like. The obtained nano structure has the advantages of high product purity, uniform diameter distribution of the core and shell, and controllable diameters and lengths. The synthesized nano structure has wide application prospects in the fields of optical fibers, sensors, catalysts and the like.

Description

technical field [0001] The invention relates to a high-purity, short rod-shaped crystalline FeWO 4 The invention relates to a method for preparing FeS core-shell nanostructure, which belongs to the technical field of material preparation. Background technique [0002] Due to its excellent chemical and physical properties, tungstate has been used in various fields, such as optical fibers, humidity sensors and catalysts. In addition, as a p-type semiconductor, iron tungstate also exhibits excellent magnetic and optical properties. However, due to the difficulty in preparing nanostructures, research in this area is still very limited. On the other hand, iron sulfide, which can be obtained by heating sulfur and iron under vacuum, has also attracted widespread attention. It is generally used as a catalyst in energy industries such as oil and natural gas. [0003] In order to improve the performance of materials and expand the application of materials, nano-heterostructures com...

Claims

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Application Information

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IPC IPC(8): C30B25/00C30B29/64C30B29/32C30B29/46B82Y40/00B82Y30/00
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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