Preparation method for gold-coated zinc oxide flower-like microspheres

A flower-shaped microsphere, zinc oxide technology, applied in the direction of zinc oxide/zinc hydroxide, nanotechnology, nanotechnology, etc., can solve the problem of lack of gold-coated zinc oxide flower-shaped microsphere preparation method, etc., to achieve good gas sensor performance and light. The effect of catalytic performance, large synthesis amount, and strong detection ability

Inactive Publication Date: 2015-05-13

YANGZHOU UNIV

5 Cites 26 Cited by

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Problems solved by technology

[0006] At present, there is a lack of a preparation method for gold-coated zinc o...

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Abstract

The invention discloses a preparation method for gold-coated zinc oxide flower-like microspheres. The preparation method comprises the following steps: (1) weighing Zn(CH3COOH)2.2H2O powder, trisodium citrate dihydrate powder and hexamethylenetetramine and dissolving in 100 ml of de-ionized water, wherein a molar ratio of Zn(CH3COOH)2.2H2O powder to trisodium citrate dihydrate powder to hexamethylenetetramine is 10 to 1 to 10; (2) putting a mixed solution into a serum bottle, reacting for 3-5 hours, taking out the serum bottle and cooling at a normal temperature; (3) performing centrifuging and cleaning on obtained precipitates and drying a product at 50-70 DEG C for 12 hours; (4) annealing at 400 DEG C for 30 minutes to obtain flower-like ZnO powder; (5) adding the ZnO powder into the de-ionized water, adding HAuCl4.4H2O, adding trisodium citrate dihydrate, and reacting; (6) performing centrifugation and cleaning on obtained precipitates to prepare the gold-coated zinc oxide flower-like microspheres. The gold-coated zinc oxide flower-like microspheres are good in gas-sensitive sensor performance and photocatalytic performance.

Application Domain

Material nanotechnologyZinc oxides/hydroxides

Technology Topic

IonFlower like +13

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Examples

Experimental program(4)
Effect test(1)

Example Embodiment

[0031] The present invention provides a method for preparing gold-coated zinc oxide flower-shaped microspheres, which includes the following steps:

[0032] (1) Weigh Zn (CH 3 COOH) 2 ·2H 2 O powder, trisodium citrate dihydrate powder, hexamethylenetetramine dissolved in 100ml deionized water, make the molar ratio of the three substances 10:1:10, and stir for 0.5h;

[0033] (2) Put the mixed solution in a serum bottle, react at 90-100°C for 3-5h, then take out the serum bottle and cool it at room temperature;

[0034] (3) Wash the obtained precipitate with deionized water and absolute ethanol by alternating centrifugation, and dry the product at 50-70°C for 12 hours;

[0035] (4) Take out the dried product and anneal it at 400°C for 30 minutes to obtain flower-like ZnO powder;

[0036] (5) Add ZnO powder to 100ml deionized water, and then add 110ul HAuCl with a mass percentage of 1% 4 ·4H 2 O was added to it, heated in an oil bath at 100-110°C for 15 minutes, 3ml of trisodium citrate dihydrate with a mass percentage of 1% was added, and the sample was taken out after 40 minutes of reaction;

[0037] (6) Wash the obtained precipitate with deionized water and absolute ethanol by alternating centrifugation, and dry the obtained product at 50-70° C. for 12 hours to prepare gold-coated zinc oxide flower-like microspheres.

[0038] The invention has simple preparation process, two-step synthesis, low cost, cheap preparation required raw materials, large synthesis amount, simple preparation process, and has better gas sensor performance and photocatalytic performance, so it can be popularized and applied in the industrial field. The invention has a large specific surface area and a hollow pompons structure, and the photocatalytic performance after being wrapped by Au and the strong detection ability for various harmful gases have been significantly improved, and especially has a strong response ability to DBP. The detection of DBP can reach the level of PPb.

Example Embodiment

[0039] Example 1

[0040] The present invention provides a method for preparing gold-coated zinc oxide flower-shaped microspheres, which includes the following steps:

[0041] (1) Weigh 0.01mol of Zn(CH 3 COOH) 2 ·2H 2 O powder 2.1951g, purity 99.99%, Sigma-Aldrich; 0.001mol trisodium citrate dihydrate powder 0.2941g, purity 99.99%, Sigma-Aldrich; 0.01mol hexamethylenetetramine 1.40186g, purity 99.99%, Sigma-Aldrich is dissolved in 100ml deionized water and stirred for 0.5h;

[0042] (2) Put the mixed solution in a serum bottle, react at 90°C for 3 hours, then take out the serum bottle and cool it at room temperature; the serum bottle is 200 ml.

[0043] (3) Wash the obtained precipitate with deionized water and absolute ethanol alternately by centrifugation, and dry the obtained product at 50°C for 12 hours;

[0044] (4) Take out the dried product and anneal it at 400°C for 30 minutes to obtain flower-like ZnO powder;

[0045] (5) Add ZnO powder to 100ml deionized water, and then add 110ul HAuCl with a mass percentage of 1% 4 ·4H 2 O was added to it, and after heating in an oil bath at 100°C for 15 minutes, 3ml of 1% by mass trisodium citrate dihydrate was added, and the sample was taken out after 40 minutes of reaction;

[0046] (6) Wash the obtained precipitate with deionized water and absolute ethanol alternately by centrifugation, and dry the obtained product at 50° C. for 12 hours to prepare gold-coated zinc oxide flower-like microspheres.

Example Embodiment

[0047] Example 2

[0048] The present invention provides a method for preparing gold-coated zinc oxide flower-shaped microspheres, which includes the following steps:

[0049] In step (1), weigh 13.1706g of Zn(CH 3 COOH) 2 ·2H 2 O powder, 1.7646g trisodium citrate dihydrate powder, 8.4112g hexamethylenetetramine dissolved in 100ml deionized water, make the molar ratio of the three substances 10:1:10, and stir for 0.5h;

[0050] In step (2), place the mixed solution in a serum bottle, react at 95°C for 4 hours, and then take out the serum bottle and cool it at room temperature;

[0051] In step (3), the obtained precipitate is washed with deionized water and absolute ethanol by alternating centrifugation, and the obtained product is dried at 60° C. for 12 h;

[0052] In step (5), add ZnO powder to 100ml of deionized water, and then add 110ul of HAuCl with a mass percentage of 1% 4 ·4H 2 O was added to it, and after heating in an oil bath at 105°C for 15 minutes, 3ml of trisodium citrate dihydrate with a mass percentage of 1% was added, and the sample was taken out after 40 minutes of reaction;

[0053] In step (6), the obtained precipitate is washed alternately with deionized water and absolute ethanol by centrifugation, and the obtained product is dried at 60° C. for 12 hours to prepare gold-coated zinc oxide flower-like microspheres.

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Classification and recommendation of technical efficacy words

Simple preparation process
Low cost

Nano porous high-temperature-insulating material taking thixotropic colloid as template agent and preparation method for high-temperature-insulating material

InactiveCN105314999AAvoid reunion and scatter problemsSimple preparation processCeramicwareThermal conductivityAerospace

Owner:浙江圣润纳米科技有限公司

Preparation method for gold-coated zinc oxide flower-like microspheres

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Description & Claims & Application Information

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