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Short-bar-shaped nano-zinc oxide/graphene compound and preparation method thereof

A nano-zinc oxide and composite technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as not applicable to practical applications, complicated operation, and reduced interaction, and achieve excellent gas Sensitivity, good application prospects, and simple operation

Inactive Publication Date: 2014-10-01
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The above-mentioned preparation method has the following defects: 1. The operation is complicated and is not suitable for practical application; 2. Nano-zinc oxide has high chemical activity, shows obvious surface effects, and easily aggregates to reach a stable state, thereby agglomerating occurs and reduces The interaction with gas leads to low sensitivity of nano-zinc oxide used in gas sensors

Method used

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  • Short-bar-shaped nano-zinc oxide/graphene compound and preparation method thereof

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preparation example Construction

[0035] Combine figure 1 , The present invention is a method for preparing short rod-shaped nano-zinc oxide / graphene composite. The method uses the surfactant polyethylene glycol 400 to uniformly load nano-zinc oxide on the surface of the graphene sheet, and specifically includes the following steps :

[0036] Step 1: Disperse the graphene oxide aqueous solution in absolute ethanol, and then perform ultrasonic treatment to obtain a uniform dispersion; the concentration of the graphene oxide aqueous solution is 5-30mg / g, and the ultrasonic time is 10-120min;

[0037] Step 2: Add the surfactant polyethylene glycol 400 to the dispersion obtained in step 1 to obtain a mixed solution; the volume ratio of polyethylene glycol 400 to the absolute ethanol in the system is 1:70 to 1:10;

[0038] Step 3: Add Zn(NO 3 ) 2 ·6H 2 O is dissolved in absolute ethanol, and then added to the mixed solution of step two; the graphene oxide aqueous solution in step one and the Zn(NO 3 ) 2 ·6H 2 The mass rat...

Embodiment 1

[0043] Step 1: Disperse 0.7550 g of graphene oxide aqueous solution (20 mg / g) in 60 mL of absolute ethanol, stir for 20-60 minutes, and then perform ultrasonic treatment for 30 minutes to obtain a uniform dispersion;

[0044] Step 2: Add 2 mL of polyethylene glycol 400 to the dispersion obtained in step 1, and stir for 20-60 minutes to obtain a mixed solution;

[0045] Step 3: Add 1.7849gZn(NO 3 ) 2 ·6H 2 O was dissolved in 10 mL of absolute ethanol, stirred for 20-60 minutes, then added to the mixed solution of step 2, and stirred for 20-60 minutes;

[0046] Step 4: Add 2.5mol / L NaOH aqueous solution to step 3, adjust the pH to 9-10, and then react at a constant temperature in a closed reaction kettle, the reaction temperature is 180°C, and the reaction time is 12h; after the reaction, the product is washed, After drying, a short rod-shaped nano-zinc oxide / graphene composite is obtained.

[0047] The photos of the resulting product are as figure 2 As shown, the short rod-shaped nano...

Embodiment 2

[0049] Step 1: Disperse 0.8221 g of graphene oxide aqueous solution (10 mg / g) in 60 mL of absolute ethanol, stir for 20-60 minutes, and then perform ultrasonic treatment for 30 minutes to obtain a uniform dispersion;

[0050] Step 2: Add 2 mL of polyethylene glycol 400 to the dispersion obtained in step 1, and stir for 20-60 minutes to obtain a mixed solution;

[0051] Step 3: Add 2.9749gZn(NO 3 ) 2 ·6H 2 O was dissolved in 10 mL of absolute ethanol, stirred for 20-60 minutes, then added to the mixed solution of step 2, and stirred for 20-60 minutes;

[0052] Step 4: Add 5mol / L NaOH aqueous solution to step 3, adjust the pH to 9-10, then react at a constant temperature in a closed reaction kettle, the reaction temperature is 180℃, and the reaction time is 24h; after the reaction, the product is washed and dried A short rod-shaped nano-zinc oxide / graphene composite is obtained.

[0053] Calculated from the gas sensitivity test, the sensitivity of the short rod-shaped nano-zinc oxide / gr...

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Abstract

The invention discloses a short-bar-shaped nano-zinc oxide / graphene compound and a preparation method thereof. Nano-zinc oxide in the compound is uniformly supported on the surface of a graphene sheet layer and shaped as a short bar. The preparation method of the compound comprises the following steps: dispersing a graphene oxide aqueous solution in absolute ethyl alcohol, and subsequently carrying out ultrasonic treatment to obtain a uniform dispersion liquid; adding a surface surfactant, namely polyethylene glycol 400, into the dispersion liquid to obtain a mixed liquid; dissolving Zn(NO3)2.6H2O in the absolute ethyl alcohol, and then adding to the mixed liquid; and adjusting pH of the mixed liquid to 9-10, then carrying out constant-temperature reaction in a sealed reaction kettle, and washing and drying a product after the reaction is ended to obtain a target product. The preparation method of the compound is a soft chemical method which is simple to operate, can be used for preparing the target product with excellent gas-sensitive property, and is good in application prospect in the field of gas-sensitive sensors.

Description

Technical field [0001] The invention relates to a nano composite and a preparation method thereof, in particular to a short rod-shaped nano zinc oxide / graphene composite and a preparation method thereof. Background technique [0002] Zinc oxide is an important semiconductor material. Due to its unique electrical and optical properties, it has attracted great attention in recent years. As we all know, the gas sensitivity 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, and have broad application prospects in the fields of gas sensors. For example, nano-scale zinc oxide shows high sensitivity to alcohol and other gases. Sensors prepared with this feature can be used to detect the alcohol concentration in the breath, prevent drunk driving and reduce traffic accidents. But the current detection sensitivity of zinc...

Claims

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Application Information

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IPC IPC(8): G01N27/26B82Y30/00
Inventor 朱俊武丁静汪信梁士明王超孟晓茜张中强
Owner NANJING UNIV OF SCI & TECH
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