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Method for preparing laminated Co(OH)2 or Co3O4 nano-rod by hydro-thermal method

A nano-rod and layered technology, which is applied in the field of hydrothermal preparation of layered Co2 or Co3O4 nano-rods, to achieve the effects of simple production equipment, cheap and easy-to-obtain raw materials, and simple preparation methods

Inactive Publication Date: 2009-09-30
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no one-dimensional sheet-like Co(OH) nanorod 2 and Co 3 o 4 The reports of nanomaterials, which have a larger specific surface area than nanorods and a surface rich in nanosheets, will have good applications in electronic devices and biology

Method used

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  • Method for preparing laminated Co(OH)2 or Co3O4 nano-rod by hydro-thermal method
  • Method for preparing laminated Co(OH)2 or Co3O4 nano-rod by hydro-thermal method
  • Method for preparing laminated Co(OH)2 or Co3O4 nano-rod by hydro-thermal method

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Experimental program
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Effect test

Embodiment 1

[0033] In 70ml deionized water, add 1mmol Co(NO 3 ) 2 ·6H 2 O and 9.5 mg Na 3 PO 4 12H 2 O, magnetically stirred for 30 min, then 5 ml of hydrazine hydrate (85% by mass) was added dropwise, and then placed in an autoclave for hydrothermal reaction at 180° C. for 18 h. The pink precipitate was separated by high-speed centrifugation (5000 rpm), washed three times with deionized water and absolute ethanol, and then vacuum-dried at 60 °C for 5 h to obtain a pink layered Co(OH) 2 Nanorod powder. The prepared product is lamellar Co(OH) 2 The nanorods have a diameter of about 100nm-300nm, a length of about 1μm-2μm, and good dispersion.

Embodiment 2

[0035] In 70ml deionized water, add 1mmol Co(NO 3 ) 2 ·6H 2 O and 9.5 mg Na 3 PO 4 12H 2 O, magnetically stirred for 30 min, then 5 ml of hydrazine hydrate (85%) was added dropwise, and then placed in an autoclave for hydrothermal reaction at 180° C. for 6 h. The pink precipitate was separated by high-speed centrifugation, washed three times with deionized water and absolute ethanol, and then vacuum-dried at 60° C. for 5 h to obtain a pink powder. Prepared Co(OH) with a smooth surface 2 The nanorod is a nanorod with a length of 1-1.5 μm and a diameter of about 200 nm.

Embodiment 3

[0037] In 70ml deionized water, add only 1mmol Co(NO 3 ) 2 ·6H 2 O, magnetically stirred for 30 min, then 5 ml of hydrazine hydrate (85%) was added dropwise, and then placed in an autoclave for hydrothermal reaction at 180° C. for 6 h. The pink precipitate was separated by high-speed centrifugation, washed three times with deionized water and absolute ethanol, and then vacuum-dried at 60 °C for 5 h to obtain pink flake Co(OH) 2 , indicating that sodium phosphate plays an important role in the formation of nanorods.

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Abstract

The invention provides a method for preparing a laminated Co(OH)2 and Co3O4 nano-rod by a hydro-thermal method. The method is characterized by taking hydrazine hydrate and sodium phosphate as structure guidance agents to control the appearance, taking cabaltous nitrate as a raw material, and taking the hydrazine hydrate to play roles of a reactant and an antioxidant at the same time. The compositions react for 18 hours under 180 DEG C of hydro thermal to obtain the laminated Co(OH)2 nano-rod; and then, the nano-rod is calcined for 4 hours at 400 DEG C to obtain the Co3O4 nano-rod. The transition process of the laminated Co(OH)2 nano-rod which can be clearly observed by changing reaction time comprises that: firstly, a nano-rod with a smooth surface is generated; then, time is prolonged to grow flakes on the side surface of the nano-rod; and finally, the nano-rod is changed into the laminated nano-rod. The nano-rod or the laminated nano-rod can be acquired by controlling the reaction time, and the laminated nano-rod has larger specific area and is rich in nano-flake periphery on the surface compared with the nano-rod.

Description

technical field [0001] The invention relates to a hydrothermal method for preparing layered Co(OH) 2 or Co 3 o 4 The nanorod method can be used in lithium-ion batteries, gas sensors, catalysis, electronics and biomedicine, etc., and belongs to the field of nanomaterials. Background technique [0002] In recent years, the controlled synthesis of nanomaterials with lamellar structures has attracted increasing attention, especially through bottom-up synthesis techniques. This will not only be of great help to the understanding of the technology of controlling the synthesis of nanomaterials with various structures, but also will have good applications in optics, mechanics, electromagnetism, electronics, catalysis and biology, because of some special properties , such as large specific surface area, many nano-tips or nano-sheets on the surface, and multi-functionalization. So far, a variety of lamellar nanomaterials have been synthesized, such as ZnO nano-corn cobs, ZnO nano-...

Claims

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Application Information

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IPC IPC(8): C01G51/04B82B3/00
Inventor 高濂孙静邵永正
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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