Preparation method of flower-like nickel oxide composed of porous sheets

A nickel oxide and flake technology, applied in the direction of nickel oxide/nickel hydroxide, etc., can solve the problems of formaldehyde selectivity, unsatisfactory response effect, irregular shape of nickel oxide, large size distribution span, etc., and achieve uniform size Controllable, uniform shape, and short response-recovery time

CN111115717AInactive Publication Date: 2020-05-08CHONGQING UNIV OF ARTS & SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-05-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of flower-like nickel oxide composed of porous sheets. The preparation method is characterized by comprising the steps: dissolving nickel acetate tetrahydrate in distilled water to form a nickel acetate solution; and dissolving PVA and urea in distilled water to form a mixed solution; slowly dropwise adding the mixed solution into a nickel acetate solution, mixing, then adding polyethylene glycol 2000, dropwise adding ammonia water with the mass concentration of 25%-28% while stirring, transferring into a reaction kettle for heating after dropwise adding is completed, and then performing centrifugal washing, drying and annealing treatment to obtain black nickel oxide. The flower-like nickel oxide prepared by the method has rich pore diameter structures and large specific surface area, and is beneficial to full contact with gas to be detected; the product is uniform in morphology, uniform and controllable in size, good in dispersity and freeof agglomeration; the yield of the product is high, when the product is used for manufacturing a gas sensitive sensor, the working temperature is low, the selectivity to formaldehyde is high, the sensitivity is high, the sensitivity to formaldehyde gas of 100 ppm or below at the normal temperature can reach 19, the response time is short, the recovery time is short, and the stability performance is good.
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Description

technical field

[0001] The invention relates to the technical field of preparation of micro-nano structured metal oxides, in particular to a method for preparing flower-like nickel oxide materials composed of porous sheets. Background technique

[0002] At present, the gas sensitive material of the metal oxide semiconductor gas sensor for ethanol and most gases should be SnO 2 , ZnO, Fe 2 o 3 、WO 3 、TiO 2 As the main matrix material, these binary oxides are broad-spectrum gas-sensing materials, and they have gas-sensing responses to a variety of gases (such as ethanol, formaldehyde, acetone, hydrogen, etc.), but lack selectivity.

[0003] Due to its unique optical and electrical characteristics, nickel oxide has a very wide range of applications in solar cells, gas sensors and other fields. So far, various morphologies of nickel oxide such as nanowires, nanorods, nanobelts, nanotubes, nanosheets, etc. have been reported in the literature. In recent years, micro-nano...

Examples

Embodiment 1

[0037] A kind of preparation method of the flower-shaped nickel oxide of porous flake composition, it is characterized in that, carry out according to the following scheme:

[0038] (1) Dissolve nickel acetate tetrahydrate in distilled water to form a nickel acetate solution, and dissolve PVA and urea in distilled water to form a mixed solution. The mass volume ratio of nickel acetate tetrahydrate and distilled water is 0.374g:5mL, and the volume of PVA, urea and distilled water The mass volume ratio is 0.25g:0.24g:5mL;

[0039] (2) Slowly add the mixed solution into the nickel acetate solution, then add polyethylene glycol 2000, add dropwise ammonia water with a mass concentration of 28% while stirring after mixing, and continue stirring at a rate of 300rpm for 10min after the dropwise addition to obtain the precursor Body solution, the volume ratio of polyethylene glycol 2000, ammonia water and mixed solution is 10:1:16;

[0040] (3) Move the precursor solution in step (2) ...

Embodiment 2

[0044] A kind of preparation method of the flower-shaped nickel oxide of porous flake composition, it is characterized in that, carry out according to the following scheme:

[0045] (1) Dissolve nickel acetate tetrahydrate in distilled water to form a nickel acetate solution, and dissolve PVA and urea in distilled water to form a mixed solution. The mass volume ratio of nickel acetate tetrahydrate and distilled water is 0.648g:5mL, and the volume of PVA, urea and distilled water The mass volume ratio is 0.25g: 0.54g: 5mL;

[0046](2) Slowly add the mixed solution into the nickel acetate solution, then add polyethylene glycol 2000, add dropwise ammonia water with a mass concentration of 25% while stirring after mixing, and continue stirring at a rate of 300rpm for 10min after the dropwise addition to obtain the precursor Body solution, the volume ratio of polyethylene glycol 2000, ammonia water and mixed solution is 10:1:18;

[0047] (3) Move the precursor solution in step (2)...

Embodiment 3

[0051] A kind of preparation method of the flower-shaped nickel oxide of porous flake composition, it is characterized in that, carry out according to the following scheme:

[0052] (1) Dissolve nickel acetate tetrahydrate in distilled water to form a nickel acetate solution, and dissolve PVA and urea in distilled water to form a mixed solution. The mass volume ratio of nickel acetate tetrahydrate and distilled water is 0.623g:5mL, and the volume of PVA, urea and distilled water The mass volume ratio is 0.25g:0.48g:5mL;

[0053] (2) Slowly add the mixed solution into the nickel acetate solution, then add polyethylene glycol 2000, add dropwise ammonia water with a mass concentration of 28% while stirring after mixing, and continue stirring at a rate of 300rpm for 10min after the dropwise addition to obtain the precursor Body solution, the volume ratio of polyethylene glycol 2000, ammonia water and mixed solution is 10:1:17;

[0054] (3) Move the precursor solution in step (2) ...