Process for synthesizing different crystal form one-dimensional single crystal mangnesium dioxide nano wire

A manganese dioxide, single crystal nanotechnology, applied in chemical instruments and methods, manganese oxide/hydroxide, single crystal growth and other directions, to achieve the effects of simple process, stable product quality and wide applicability

Inactive Publication Date: 2002-11-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned domestic and foreign related research can only prepare a single crystal form of manganese dioxide, and the product morphology is block or nanocrystal
The selective control of the synthesis of manganese dioxide one-dimensional single crystal nanowires has not been reported at home and abroad

Method used

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  • Process for synthesizing different crystal form one-dimensional single crystal mangnesium dioxide nano wire
  • Process for synthesizing different crystal form one-dimensional single crystal mangnesium dioxide nano wire
  • Process for synthesizing different crystal form one-dimensional single crystal mangnesium dioxide nano wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 1.3g of analytically pure manganese sulfate and 1.8g of ammonium persulfate into a 40ml stainless steel pressure-resistant reactor, add deionized water, and stir to form a uniform solution. Seal the reactor and react at 140°C for 12h. Then cool to room temperature, open the reaction kettle, filter with Buchner funnel, and wash with deionized water to obtain a black powder. The product is identified as β-type manganese dioxide by X-ray powder diffraction; the appearance of the product detected by TEM electron microscope: the diameter is 40-100 nanometers, and the length is 2.5-4.0 microns. Single nanowire electron diffraction proves that the product is a single crystal. Under the same conditions, control the reaction temperature at 100, 160, and 220°C, and use manganese chloride or manganese carbonate as the divalent manganese salt to obtain β-type manganese dioxide one-dimensional single-crystal nanowires. Different, the aspect ratio of the product is slightly d...

Embodiment 2

[0023] Weigh 1.3g of analytically pure manganese sulfate, 1.8g of ammonium persulfate and 3g of ammonium sulfate into a 40ml stainless steel pressure-resistant reactor, add deionized water, and stir to form a uniform solution. Seal the reactor and react at 120°C for 12h. Then cool to room temperature, open the reaction kettle, filter with Buchner funnel, and wash with deionized water to obtain a black powder. The product is identified as α-type manganese dioxide by X-ray powder diffraction; the appearance of the product detected by TEM electron microscope: the diameter is 5-20 nanometers, and the length is 3-10 microns. Single nanowire electron diffraction proves that the product is a single crystal. Under the same conditions, control the reaction temperature at 100, 160, and 220°C, and use manganese chloride or manganese carbonate as the divalent manganese salt to obtain α-type manganese dioxide one-dimensional single crystal nanowires. According to the preparation condition...

Embodiment 3

[0025] Weigh 0.3g of analytically pure manganese sulfate and 0.5g of potassium permanganate, place them in a 40ml stainless steel pressure-resistant reactor, add deionized water, and stir to form a uniform solution. React in a sealed reactor at 180°C for 6h. Then cool to room temperature, open the reaction kettle, filter with Buchner funnel, and wash with deionized water to obtain a black powder. The divalent manganese salt can be manganese chloride or manganese carbonate, and the reaction can be carried out at 100, 160, 220°C. It was detected as α-type manganese dioxide nanorods.

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Abstract

The present invention relates to the preparation of nano material. One-dimensional monocrystalline nano manganese dioxide wire of different crystal form is synthesized selectively via controlling thetemperature, period and material control of the hydrothermal reaction of two-valent manganese salt and ammohnium persulfate as raw material and ammonium sulfate as additive at 100-220 deg.c inside one sealed reactor. The process may be widely used in basic theory research in lithium ion cell, molecular sieve and relevant fields.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for synthesizing one-dimensional single crystal nanowires with different crystal forms. The preparation of one-dimensional single-crystal nanowires is a frontier topic in international research on nanomaterials, and has a good application prospect. Background technique [0002] The existing methods for synthesizing manganese dioxide cannot control the crystal form, and are limited to the generation of bulk materials. British "Nature" (Nature) magazine, 1996, volume 381, page 500, reported that layered manganese dioxide was prepared by ion exchange; U.S. "Journal of Solid State Chemistry" (Journal of solid state chemistry), 1995, volume 120, page 70 The pyrolysis of sodium permanganate was used to prepare layered manganese dioxide; in 1999, page 136 of volume 144 of the magazine reported the preparation of α-manganese dioxide by pyrolysis; in 2001, page 94 of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C30B29/16
Inventor 李亚栋王训
Owner TSINGHUA UNIV
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