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Method for direct synthesis of Mn<+>-doped SnO2 nanocrystals with one-step hydrothermal method

A hydrothermal method and nanocrystalline technology, applied in the field of photocatalytic materials, can solve the problems of expensive equipment, high production cost, low yield, etc., and achieve the effects of simple equipment, easy control of conditions, and no template assistance.

Inactive Publication Date: 2015-03-11
ANHUI SCI & TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Synthesis of SnO with Different Morphologies by Chemical Vapor Deposition (CVD) and Electrospinning 2 The equipment used for nanomaterials is expensive and the production cost is high; the liquid-phase method is used to synthesize SnO with a certain shape and size 2 Nanomaterials need template assistance, the yield is not high, template removal is difficult, and it is not environmentally friendly
Production of SnO by solid phase method 2 For nanomaterials, the product morphology is poor; CVD or liquid phase method plus high temperature calcination method to synthesize doped SnO 2 Nano, the production cost is high, and the shape and scale of the calcined product are not regular

Method used

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  • Method for direct synthesis of Mn&lt;+&gt;-doped SnO2 nanocrystals with one-step hydrothermal method
  • Method for direct synthesis of Mn&lt;+&gt;-doped SnO2 nanocrystals with one-step hydrothermal method
  • Method for direct synthesis of Mn&lt;+&gt;-doped SnO2 nanocrystals with one-step hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Flower-shaped doping with Zn 2+ SnO 2 Hydrothermal Preparation of Nanocrystals

[0023] The first step, now will contain 3mmol of SnCl 4 5H 2 O solution was added dropwise to NaOH solution containing 20 mmol, under the condition of magnetic stirring, until a stable and transparent solution was formed.

[0024] In the second step, the ZnCl containing 0.3mmol 2 The solution was added dropwise to the above solution, under the condition of magnetic stirring until a stable suspension was formed.

[0025] In the third step, the above-mentioned suspension is transferred to a high-pressure reaction kettle with a capacity of 60mL polytetrafluoroethylene inner bag, and then water is added to 80%, and the rear seal is put into an oven, and a certain reaction time is set. 36 h and a reaction temperature of 200 °C.

[0026] In the fourth step, after the autoclave is naturally cooled, the precipitate in the autoclave is centrifuged and washed several times, and then ...

Embodiment 2

[0028] Embodiment 2 doping Mn 2+ SnO 2 Hydrothermal Preparation of Nanocrystals

[0029] The first step, now will contain 5mmol of SnCl 4 5H 2 O solution was added dropwise to NaOH solution containing 35 mmol, under the condition of magnetic stirring, until a stable and transparent solution was formed.

[0030] In the second step, the MnCl containing 0.5mmol 2 The solution was added dropwise to the above solution, under the condition of magnetic stirring until a stable suspension was formed.

[0031] In the third step, the above-mentioned suspension is transferred to a high-pressure reaction kettle with a capacity of 60mL polytetrafluoroethylene inner bag, and then water is added to 80%, and the rear seal is put into an oven, and a certain reaction time is set. 36 h and a reaction temperature of 140 °C.

[0032] In the fourth step, after the autoclave is naturally cooled, the precipitate in the autoclave is centrifuged and washed several times, and then dried in an oven ...

Embodiment 3

[0033] Example 3 doping Co 2+ SnO 2 Hydrothermal Preparation of Nanocrystals

[0034] The first step, now will contain 4mmol of SnCl 4 5H 2 O solution was added dropwise to NaOH solution containing 30 mmol, under the condition of magnetic stirring, until a stable and transparent solution was formed.

[0035] In the second step, the CoCl containing 0.4mmol 2 The solution was added dropwise to the above solution, under the condition of magnetic stirring until a stable suspension was formed.

[0036] In the third step, the above-mentioned suspension is transferred to a high-pressure reaction kettle with a capacity of 60mL polytetrafluoroethylene inner bag, and then water is added to 80%, and the rear seal is put into an oven, and a certain reaction time is set. 24 h and a reaction temperature of 170 °C.

[0037] In the fourth step, after the autoclave is naturally cooled, the precipitate in the autoclave is centrifuged and washed several times, and then dried in an oven at ...

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Abstract

The invention discloses a method for direct synthesis of Mn<+>-doped SnO2 nanocrystals with a one-step hydrothermal method, wherein the method comprises the following steps: under stirring, slowly dropwise adding an Sn<4+> salt solution into an NaOH solution, and forming a transparent solution; then dropwise adding an Mn<+> salt solution into the above solution, and forming a suspension; transferring the suspension into a high-pressure reaction kettle, adding distilled water, then sealing, putting into an electric heating drying oven, and at the temperature of 140-200 DEG C, carrying out a reaction for 12-36 h; after the reaction is finished and after the high-pressure reaction kettle is naturally cooled, opening the reaction kettle, taking out a precipitate in a polytetrafluoroethylene container, separating, and respectively washing with distilled water and absolute ethyl alcohol, putting the precipitate in a 60 DEG C vacuum drying oven, drying for 4-6 h, and thus obtaining the product. The Mn<+>-doped SnO2 nanocrystals have the advantages of good morphology and regular dimension; and the method has the advantages of simple instrument and equipment, simple process, easily controlled conditions, and green environmental protection.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a one-step hydrothermal method for directly synthesizing doped M n+ SnO 2 nanocrystal approach. Background technique [0002] SnO 2 It is an important wide-bandgap (Eg=3.6eV) n-type inorganic semiconductor with excellent photoelectric performance and gas-sensing properties. Wide range of uses and application prospects. The performance and use of the material depend on the size and shape of its particles, and two methods can be used to improve and improve the SnO 2 performance, one is to make nanomaterials with different shapes, and the other is to dope them with different ions (M n+ ). Because SnO 2 The molecule is non-polar and tends to form globules when left uncontrolled in both liquid and solid phase syntheses. In recent years, scientific and technological workers have successfully synthesized SnO by chemical vapor deposition (CVD) and electrospinning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02B82Y30/00
CPCC01G19/02C01P2002/72C01P2004/03C01P2004/04C01P2004/45C01P2004/80
Inventor 李子荣郑胜彪
Owner ANHUI SCI & TECH UNIV
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