A kind of ultra-high sensitivity noble metal-modified zno micro-nano hierarchical structure and its preparation method

A hierarchical structure, precious metal technology, applied in chemical instruments and methods, analytical materials, other chemical processes, etc., can solve problems such as insufficient sensitivity, and achieve the effect of improving sensitivity, improving adsorption capacity, increasing sensitivity and stability

Inactive Publication Date: 2017-05-03
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the shortcomings of insufficient sensitivity based on traditional ZnO materials, the present invention proposes a ZnO micro-nano hierarchical structure composed of ultra-thin single-crystal porous ZnO nanosheets modified by precious metal particles

Method used

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  • A kind of ultra-high sensitivity noble metal-modified zno micro-nano hierarchical structure and its preparation method
  • A kind of ultra-high sensitivity noble metal-modified zno micro-nano hierarchical structure and its preparation method
  • A kind of ultra-high sensitivity noble metal-modified zno micro-nano hierarchical structure and its preparation method

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Experimental program
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Embodiment 1

[0042] (1) Synthesis of ZnO micro-nano hierarchical structure: 1 g of zinc acetate (Zn(CH 3 COO) 2 ) and 4g urea (CO(NH 2 ) 2 ) was dissolved in 40ml of a mixed solvent composed of deionized water and ethylene glycol in a volume ratio of 3:1, stirred to form a transparent solution; then transferred to a sealed Erlenmeyer flask and placed in an oven at a temperature of 90ºC and keep warm for 10h; then centrifuge to separate the white precipitate, wash it 2-3 times with deionized water, put it into a 60ºC vacuum drying oven to dry the ZnO precursor; finally put the dried ZnO precursor in a 400ºC horse Annealing in a Furnace or a tube furnace can obtain a ZnO micro-nano hierarchical structure composed of ultra-thin single-crystal porous ZnO nanosheets.

[0043] The ZnO micro-nano hierarchical structure prepared in this embodiment is as follows figure 1 As shown in 1d, its shape is flower-like.

[0044] In addition, the scanning electron microscope images and electron diffrac...

Embodiment 2

[0052] (1) Synthesis of ZnO micro-nano hierarchical structure: 0.5 g of zinc acetate (Zn(CH 3 COO) 2 ) and 3g urea (CO(NH 2 ) 2 ) was dissolved in 50ml of a mixed solvent consisting of deionized water and ethylene glycol at a volume ratio of 1:1, stirred for 3 minutes to form a transparent solution; then transferred to a sealed Erlenmeyer flask, and placed in a In the oven, keep warm for 8h; then use centrifugation to separate the obtained white precipitate from the solution, and wash it with deionized water for 2-3 times, then put it into a 60ºC vacuum drying oven to dry to obtain the ZnO precursor; finally put The dried ZnO precursor is annealed at 300ºC to obtain the following figure 1 In the spherical ZnO micro-nano hierarchical structure shown in 1c, the ultra-thin single-crystal porous ZnO nanosheets are about 2 µm in length, 400 nm in width, and 8 nm in thickness, and the nanoholes are evenly distributed throughout the nanosheet.

[0053] (2) Modification of ZnO mic...

Embodiment 3

[0057] (1) Synthesis of ZnO micro-nano hierarchical structure: 0.5 g of zinc acetate (Zn(CH 3 COO) 2 ) and 1g urea (CO(NH 2 ) 2 ) was dissolved in 40ml of a mixed solvent composed of deionized water and ethylene glycol in a volume ratio of 1:1, stirred to form a transparent solution, and then transferred to a sealed Erlenmeyer flask and placed in an oven at a temperature of 75ºC and keep it warm for 5 hours; then use centrifugation to separate the obtained white precipitate from the solution, wash it with deionized water for 2-3 times, and then put it into a 60ºC vacuum oven to dry to obtain the ZnO precursor; finally dry The ZnO precursor is annealed at 300ºC to get the following figure 1 In the spherical ZnO micro-nano hierarchical structure shown in 1b, the ultra-thin single-crystal porous ZnO nanosheets are about 4 µm in length, 500 nm in width, and 12 nm in thickness, and the nanoholes are evenly distributed throughout the nanosheet.

[0058] (2) Modification of ZnO m...

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Abstract

The invention provides a preparation method of a super high sensitivity precious metal-modified ZnO micro-nano hierarchical structure, and the method is as follows: 1, synthesis of a micro-nano hierarchical structure comprising ultrathin porous nano single crystal ZnO nanosheets; 2, modification of the ZnO micro-nano hierarchical structure; and 3, preparation of the precious metal-modified ZnO micro-nano hierarchical structure. The super high sensitivity precious metal-modified ZnO micro-nano hierarchical structure prepared by the method has the characteristics of single crystal, ultrathin thin, porous and hierarchical structure and assistant precious metal nanoparticle modification, the points are beneficial to improvement of the sensitivity of ZnO to organic gaseous pollutants, compared with the ZnO materials in the prior art, the super high sensitivity precious metal-modified ZnO micro-nano hierarchical structure has super high gas sensitivity, and the detection limit is less than 1ppb.

Description

technical field [0001] The invention relates to a detection instrument for organic gas pollutants, in particular to a noble metal-modified ultra-thin single-crystal porous ZnO micro-nano hierarchical structure with ultra-high sensitivity to organic pollutants and a preparation method thereof. Background technique [0002] Organic gas pollutants such as ethanol, formaldehyde, benzene, and toluene brought by decoration materials have great damage to human health, and are likely to cause respiratory diseases, pneumonia, bronchitis and other diseases, and even have the risk of cancer. Therefore, the detection and real-time monitoring of organic gas pollutants have been widely concerned. At present, the traditional detection techniques of organic gas pollutants are chemical analysis methods, such as gas chromatography and mass spectrometry. This detection method has a large workload, complicated procedures, expensive equipment, and cannot realize real-time detection. Electrical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00B01J20/06B01J20/30
CPCB01J20/06B01J20/28014B01J20/28019B01J20/281B01J2220/48B01J2220/54B01J2220/80G01N27/00
Inventor 金震
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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