A general method for the assembly of ultrathin porous nanosheets using metal oxide quantum dots

A general method and oxide technology, applied in nanotechnology, cobalt oxide/cobalt hydroxide, nickel oxide/nickel hydroxide, etc., can solve the problems of difficult and ultra-thin porous layer flaky nanomaterials, and achieve uniform pore distribution, The effect of stable morphology and less demand for raw materials and equipment types

Active Publication Date: 2021-08-13
合肥迈微新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter the "top-down" or "bottom-up" preparation method is adopted, it is difficult to prepare ultra-thin porous sheet-like nanomaterials with uniform pore distribution and uniform pore size in a large-scale and controllable manner.

Method used

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  • A general method for the assembly of ultrathin porous nanosheets using metal oxide quantum dots
  • A general method for the assembly of ultrathin porous nanosheets using metal oxide quantum dots
  • A general method for the assembly of ultrathin porous nanosheets using metal oxide quantum dots

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment prepares CO as follows 3 O 4 Porous nanoflakes:

[0034] 1) Weigh 2G CO 3 O 4 The initial powder (purchased from the ALO) was placed in a 50 ml centrifuge tube, and then 40 ml of liquid nitrogen was injected into the centrifuge tube, and the centrifuge tube was immersed in the thermos of liquid nitrogen for 12 hours, thereby completing ultra-low temperature cold frit. Pretreatment;

[0035] 2) Remove the centrifuge tube of step 1), after the liquid is completely volatilized, then the powder is immediately dispersed in a mixed solvent of 500 ml of isopropanol and a water volume ratio of 1: 1, and the ultrasonic power ultrasound is broken. Treatment 10 hours, then centrifuge at 10,000 rpm for 5min, take the upper layer, to produce CO 3 O 4 Quantum dispersion;

[0036] 3) at 500ml CO 3 O 4 The quantum dot dispersion was added to 15 mg of oxide powder, and the ultrasonic dispersion was uniformly dispersed, and the heat treatment was 12 h at 180 ° C to obtain CO. ...

Embodiment 2

[0040] This embodiment prepares CO as follows 3 O 4 Porous nanoflakes:

[0041] 1) Weigh 1G CO 3 O 4 The initial powder (purchased from the ALO) was placed in a 50 ml centrifuge tube, and then 35 ml of liquid nitrogen was injected into the centrifuge tube, and the centrifuge tube was immersed in the thermos of liquid nitrogen for 14 hours, thereby completing ultra-low temperature cold frit. Pretreatment;

[0042] 2) Remove the centrifuge tube of step 1), after the liquid is completely volatilized, immediately after the treatment is dispersed in a 500 mL of 1-methyl-2-pyrrolidone solvent, and the crushing treatment is 8 hours by ultrasonic power of 300W, then 8000rpm Centrifuge 10min, take the upper layer, to make CO 3 O 4 Quantum dispersion;

[0043] 3) at 500ml CO 3 O 4 The quantum dot dispersion was added to 12 mg of oxide oxide powder, and the ultrasonic dispersion was uniformly dispersed, and the heat treatment was 180 ° C for 12 h, resulting in CO 3 O 4 / GO hydrogel;

[0044...

Embodiment 3

[0047] This embodiment prepares CO as follows 3 O 4 Porous nanoflakes:

[0048] 1) Weigh 0.1g Co 3 O 4 The initial powder (the powder preparation method is: 0.01 mol of hexahydrate and 0.01 mol urea is dissolved in 40 ml of deionized water, 150 ° C water heat treatment for 5 h, the resulting powder 500 ° C air annealing 3h is given into 50 ml of centrifuge tube In the centrifuge tube, 40 ml of liquid nitrogen was then injected into the centrifuge tube, and the centrifuge tube was immersed in the insulation tub in liquid nitrogen, thereby completing ultra-low temperature freezing and criticization pretreatment;

[0049] 2) Remove the centrifuge tube of step 1), after the liquid is completely volatilized, the treatment is immediately dispersed in a mixed solvent of 100 ml of isopropanol and a water volume ratio of 1: 1, and the ultrasonic power is ultrasound. Handling 6 hours, then 6000 rpm is centrifuged for 20min, take the upper layer, and produce CO 3 O 4 Quantum dispersion;

[0...

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Abstract

The invention discloses a general method for assembling ultra-thin porous nanosheets using metal oxide quantum dots, which is: using at least one metal oxide powder as a precursor, through ultra-low temperature freeze embrittlement pretreatment and ultrasonic stripping and crushing treatment, to obtain metal A dispersion of oxide quantum dots; then the dispersion of metal oxide quantum dots and graphene oxide are mixed uniformly and then hydrothermally treated to obtain a metal oxide / graphene oxide composite hydrogel; finally, the composite hydrogel is freeze-dried And carry out annealing treatment in air atmosphere, namely the metal oxide ultra-thin porous nano sheet is prepared. The invention has simple process and low cost, and can batch prepare quantum dots of pure phase or multiple mixed components without complex chemical modification and modification treatment, and assemble them to obtain ultrathin and porous metal oxide nanosheets.

Description

Technical field [0001] The present invention belongs to the field of nanomaterial self-assembly technology, and more particularly to a general method of assembling ultra-thin porous nanochi using a metal oxide quantum point. Background technique [0002] In recent years, metal oxides have received more and more attention and research due to their many excellent physicochemical properties, and are widely used in catalytic, sensing, energy storage. Metal oxide nano material has a wide range of methods, such as sol gel method, hydrolysis, chemical synthesis, microemulsion method, etc., is generally divided into three categories of solid phase, liquid phase, and gas phase method. While using one or more of these methods can prepare a nanometer-scale metal oxide having various topography, the reaction reagent employed in most methods is complex, and the product scale is not easy. [0003] The porous metal oxide layer-like nanomaterial can exhibit more excellent electrochemical propert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04C01G53/04B82Y40/00
Inventor 王岩朱天钰吴玉程余翠平崔接武秦永强舒霞张勇
Owner 合肥迈微新材料技术有限公司
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