Cobaltosic oxide-zinc oxide/grapheme ternary complex and preparation method thereof

A technology of tricobalt tetroxide and ternary composites, which is applied in the direction of cobalt oxide/cobalt hydroxide, zinc oxide/zinc hydroxide, and electrochemical variables of materials, which can solve the problem of reducing material performance, poor selectivity of specific gas response, and easy occurrence of nanoparticles Agglomeration and other problems, to achieve the effect of preventing agglomeration, excellent gas-sensing performance, and good application prospects

Active Publication Date: 2014-12-24
NANJING UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0008] (1) The small size effect of nanomaterials causes nanoparticles to easily agglomerate, reducing the performa

Method used

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  • Cobaltosic oxide-zinc oxide/grapheme ternary complex and preparation method thereof
  • Cobaltosic oxide-zinc oxide/grapheme ternary complex and preparation method thereof
  • Cobaltosic oxide-zinc oxide/grapheme ternary complex and preparation method thereof

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preparation example Construction

[0033] combine figure 1 , the preparation method of a kind of tricobalt tetroxide-zinc oxide / graphene ternary compound of the present invention, specifically comprises the following steps:

[0034] Step 1: ultrasonically treating the graphene oxide aqueous solution to obtain a uniform dispersion;

[0035]Step 2: Co(NO 3 ) 2 ·6H 2 O is added to the dispersion in step 1 to obtain a mixed solution a;

[0036] Step 3: adding ammonia water and surfactant PVP to the mixed solution a in step 2 to obtain the mixed solution b;

[0037] Step 4: reacting the mixed solution b in step 3 at a constant temperature in a reflux device;

[0038] Step 5: After the reflux reaction finishes, Zn(NO 3 ) 2 ·6H 2 O, ammoniacal liquor are mixed with step 4 mixed solution b to form a reaction solution;

[0039] Step 6: The above-mentioned reaction solution is reacted at a constant temperature in a closed reaction kettle; the product is washed and dried to obtain a nano-cobalt oxide-zinc oxide / g...

Embodiment 1

[0050] Step 1: 35ml of graphene oxide aqueous solution (0.2mg / ml) was ultrasonically treated for 60min to obtain a uniform dispersion;

[0051] Step 2: 0.875gCo(NO 3 ) 2 ·6H 2 O is added to the dispersion in step 1 to obtain a mixed solution a;

[0052] Step 3: Add 30ml of ammonia water (concentration: 28wt%) and 0.1g of PVP surfactant into the mixed solution a in step 2 to obtain the mixed solution b;

[0053] Step 4: React the mixed liquid b in step 3 at a constant temperature in a reflux device, the reaction temperature is 100°C, and the reaction time is 6h;

[0054] Step five: after the reflux reaction finishes, 0.301g Zn(NO 3 ) 2 ·6H 2 0, 5ml ammoniacal liquor (concentration is 28wt%) mixes with step 4 mixed solution b, forms reaction solution;

[0055] Step 6: The above-mentioned reaction solution was reacted at a constant temperature in a closed reaction kettle, the reaction temperature was 180° C., and the reaction time was 18 hours; the product was washed and d...

Embodiment 2

[0058] Step 1: 35ml of graphene oxide aqueous solution (1.5mg / ml) was ultrasonically treated for 10min to obtain a uniform dispersion;

[0059] Step 2: 0.525gCo(NO 3 ) 2 ·6H 2 O is added to the dispersion in step 1 to obtain a mixed solution a;

[0060] Step 3: Add 30ml of ammonia water (concentration: 20wt%) and 0.014g of PVP surfactant into the mixed solution a in step 2 to obtain mixed solution b;

[0061] Step 4: React the mixed liquid b in Step 3 at a constant temperature in a reflux device, the reaction temperature is 80°C, and the reaction time is 3h;

[0062] Step five: after the reflux reaction finishes, 1.3125gZn(NO 3 ) 2 ·6H 2 0, 5ml ammoniacal liquor (concentration is 20wt%) mixes with step 4 mixed solution b, forms reaction solution;

[0063] Step 6: The above-mentioned reaction solution was reacted at a constant temperature in a closed reaction kettle, the reaction temperature was 150° C., and the reaction time was 48 hours; the product was washed and drie...

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Abstract

The invention discloses a cobaltosic oxide- zinc oxide/grapheme ternary complex and a preparation method thereof. The cobaltosic oxide-zinc oxide/grapheme ternary complex is prepared by the following steps: Co(No3)2 6H2O and a graphene oxide water solution are mixed, then an ammonia-water solution and a surface active agent PVP are added, and during a constant temperature backflow heat treatment process, Co(OH)2 loaded on graphene is produced; then, Zn(NO3)2 6H2O is added, then ammonia water is added again, and Zn(NH3)42+ and Zn(OH)2 are generated; finally, during a constant temperature heat treatment process of a reacting kettle, Co(OH)2 and Zn(OH)2 are taken as particles and grow through ostwald ripening, so as to form nanometer cobaltosic oxide and nano-zinc oxide particles loaded on the graphene, and the cobaltosic oxide-zinc oxide/grapheme ternary complex is prepared. The cobaltosic oxide-zinc oxide/grapheme ternary complex prepared according to the preparation method provided by the invention, an excellent gas-sensitive property is shown and the cobaltosic oxide- zinc oxide/grapheme ternary complex has a relatively good application prospect in the field of gas sensors.

Description

technical field [0001] The invention relates to a nano preparation method, in particular to a three-cobalt tetroxide-zinc oxide / graphene ternary compound and a preparation method thereof. Background technique [0002] The n-type semiconductor zinc oxide is an important semiconductor material, which has attracted great attention in recent years due to its unique electrical and optical properties. It is well known that the gas-sensing performance is related to the morphology of the material, especially the surface area of ​​the material. Nano-zinc oxide materials have the characteristics of large specific surface area and easy preparation of composite materials. As gas-sensitive materials, they have good application prospects in detecting toxic, harmful and flammable gases, but there are still many needs in terms of selectivity, sensitivity and working temperature. The improvement; the p-type semiconductor cobalt tetroxide has high catalytic activity and gas-sensing performan...

Claims

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Application Information

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IPC IPC(8): G01N27/26C01G51/04C01G9/02B82Y30/00
Inventor 朱俊武王超汪信毕慧平梁士明丁静孟晓茜张中强
Owner NANJING UNIV OF SCI & TECH
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