ZnO-CdS@Au nano composite and preparation method and application thereof

A nanocomposite material and nanoparticle technology, which is applied in the field of ZnO-CdS@Au nanocomposite material and its preparation, can solve the problems of low photocatalytic activity and low use efficiency, and achieve good detection stability, low detection limit, and improved The effect of optoelectronic properties

Inactive Publication Date: 2017-05-24
QUFU NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the current ZnO materials have low

Method used

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  • ZnO-CdS@Au nano composite and preparation method and application thereof
  • ZnO-CdS@Au nano composite and preparation method and application thereof
  • ZnO-CdS@Au nano composite and preparation method and application thereof

Examples

Experimental program
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Example Embodiment

[0037] Example 1

[0038] 1.4875g of Zn(NO 3 ) 2 ·6H 2 O dissolved in 20mL deionized water, 0.7408g NH 4 F was dissolved in 10 mL of deionized water, after the two were mixed, fully stirred at room temperature, dispersed uniformly, and placed in an oil bath. 0.8002 g NaOH dissolved in 10 mL deionized water was added dropwise. When a small amount of NaOH is added, a white precipitate is immediately formed. After adding NaOH, it partially dissolves. The solution becomes translucent and then becomes turbid. Stir at 2000r / min at 100°C for 10 hours, cool to room temperature, and centrifuge the product. Alternate washing with deionized water and ethanol 4 times to obtain a white precipitate, which was dried at 60°C to obtain crystalline spindle-shaped ZnO nanoparticles.

Example Embodiment

[0039] Example 2

[0040] Take 0.2364g Cd(NO 3 ) 2 ·4H 2 The mixed solution of O and 0.0761g thiourea dissolved in 100mL deionized water was used as solution A. The 0.4mg ZnO nanoparticles prepared in Example 1 were uniformly dispersed in 10mL solution A and then stirred at a rotation speed of 2000r / min at 90 After heating in an oil bath at ℃ for 30 minutes, cooling to room temperature, centrifugation, and washing with deionized water and ethanol 4 times alternately, the yellow precipitated ZnO-CdS was obtained, and dried at 60℃ to obtain a yellow powder. The change from white to yellow indicates the success of CdS nanoparticles Deposited on the surface of ZnO nanoparticles.

Example Embodiment

[0041] Example 3

[0042] Disperse 20 mg of ZnO-CdS prepared in Example 2 into 25 mL of deionized water, stir evenly to a clear solution, add 0.54 mL, 1 wt% of chloroauric acid deionized water solution and mix well, reflux at 110°C, and start timing at 108°C. After 15 minutes, add 1.5 mL of 0.04M sodium citrate deionized water solution, heat for 40 minutes, cool to room temperature, centrifuge, wash with deionized water and ethanol alternately 4 times, and dry at 80°C for 6 hours to obtain ZnO-CdS@Au nanocomposite material.

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Abstract

The invention belongs to the technical field of novel nano materials, and particularly relates to a ZnO-CdS@Au nano composite and a preparation method and application thereof. The nano composite is prepared in the mode that spindle-shaped ZnO nano particles are used as a substrate, CdS nano particles are deposited on the surface of the substrate, and finally, the substrate is coated with Au nano particles. The preparation method of the ZnO-CdS@Au nano composite comprises the steps that firstly, Zn(NO3)2.6H2O, NH4F and NaOH are subjected to reaction to obtain the white precipitated ZnO nano particles; secondly, the ZnO nano particles, Cd(NO3)2.4H2O and thiourea are subjected to reaction to form suspended liquid, and the suspended liquid is deposited and centrifuged to obtain a ZnO-CdS product; and thirdly, chloroauric acid and sodium citrate are added into the ZnO-CdS product, and refluxing, cooling and centrifuging are conducted to obtain the ZnO-CdS@Au nano composite. According to the ZnO-CdS@Au nano composite and the preparation method and application thereof, the photoelectric characteristic of the nano material is improved, and the ZnO-CdS@Au nano composite can be used for rapidly and accurately detecting tetracycline.

Description

technical field [0001] The invention belongs to the technical field of new nanometer materials, and in particular relates to a ZnO-CdS@Au nanocomposite material and its preparation method and application. Background technique [0002] ZnO is a new type of multifunctional Ⅱ-Ⅵ group, wide bandgap semiconductor material with high exciton binding energy. It has the advantages of non-toxicity, good biocompatibility, high electrochemical activity and strong electron transport ability. , surface acoustic wave and piezoelectric materials, field emission devices, sensors, ultraviolet lasers, solar cells, etc. have been widely used. Studies have shown that the properties of zinc oxide depend on its microstructure, including crystal size, morphology, specific surface area, and crystal density. In addition, the construction of morphology and surface structure is also a very important aspect. [0003] However, current ZnO materials have low photocatalytic activity and low light use effi...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02G01N27/26B82Y40/00B82Y30/00
CPCG01N27/26B82Y30/00B82Y40/00B22F9/24B22F1/054B22F1/17
Inventor 渠凤丽张晓萍
Owner QUFU NORMAL UNIV
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