Preparation method of rGO/ZnCo2O4/Au ternary composite room temperature gas-sensitive material

A gas-sensitive material and ternary composite technology, which is applied in the fields of nanotechnology for materials and surface science, analysis of materials, analysis of gas mixtures, etc., can solve problems such as high-tech deep processing exploration is still in the initial stage and so on.

Inactive Publication Date: 2017-08-04
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country is the country with the most abundant graphite resources, and it is also a major producer, but the exploration of its high-tech deep processing is still in its infancy

Method used

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  • Preparation method of rGO/ZnCo2O4/Au ternary composite room temperature gas-sensitive material
  • Preparation method of rGO/ZnCo2O4/Au ternary composite room temperature gas-sensitive material
  • Preparation method of rGO/ZnCo2O4/Au ternary composite room temperature gas-sensitive material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Weigh 10 mg of graphene oxide GO prepared by the improved Hummers method, and ultrasonically disperse it in 40 mL of deionized water to obtain a GO colloidal solution, in which the concentration of GO is 0.25 mg / mL;

[0017] (2) Weigh a certain amount of zinc nitrate hexahydrate, cobalt nitrate hexahydrate, sodium citrate and hexamethylenetetramine, dissolve into the GO colloidal solution obtained in step (1), stir at room temperature for 1 hour, in which zinc nitrate hexahydrate The concentration of cobalt nitrate hexahydrate is 0.005mol / l, the concentration of cobalt nitrate hexahydrate is 0.01mol / l, the concentration of sodium citrate is 0.00375mol / l, the concentration of hexamethylenetetramine is 0.0125mol / l, and the concentration of nitric acid hexahydrate is controlled The molar ratio of zinc to cobalt nitrate hexahydrate is 1:2, the molar ratio of zinc nitrate hexahydrate to sodium citrate is 1:0.75, and the molar ratio of zinc nitrate hexahydrate to hexamethy...

Embodiment 2

[0021] (1) Weigh 20 mg of graphene oxide GO prepared by the improved Hummers method, and ultrasonically disperse it in 50 mL of deionized water to obtain a GO colloidal solution, in which the concentration of GO is 0.4 mg / mL;

[0022] (2) Weigh a certain amount of zinc nitrate hexahydrate, cobalt nitrate hexahydrate, sodium citrate and hexamethylenetetramine, dissolve into the GO colloidal solution obtained in step (1), stir at room temperature for 1 hour, in which zinc nitrate hexahydrate The concentration of cobalt nitrate hexahydrate is 0.01mol / l, the concentration of cobalt nitrate hexahydrate is 0.02mol / l, the concentration of sodium citrate is 0.01mol / l, the concentration of hexamethylenetetramine is 0.02mol / l, and the concentration of nitric acid hexahydrate is controlled The molar ratio of zinc to cobalt nitrate hexahydrate is 1:2, the molar ratio of zinc nitrate hexahydrate to sodium citrate is 1:1, and the molar ratio of zinc nitrate hexahydrate to hexamethylenetetram...

Embodiment 3

[0026] (1) Weigh 15 mg of graphene oxide GO prepared by the improved Hummers method, and ultrasonically disperse it in 50 mL of deionized water to obtain a GO colloidal solution, in which the concentration of GO is 0.3 mg / mL;

[0027] (2) Weigh a certain amount of zinc nitrate hexahydrate, cobalt nitrate hexahydrate, sodium citrate and hexamethylenetetramine, dissolve into the GO colloidal solution obtained in step (1), stir at room temperature for 1 hour, in which zinc nitrate hexahydrate The concentration of cobalt nitrate hexahydrate is 0.02mol / l, the concentration of cobalt nitrate hexahydrate is 0.06mol / l, the concentration of sodium citrate is 0.04mol / l, the concentration of hexamethylenetetramine is 0.06mol / l, and the concentration of nitric acid hexahydrate is controlled The molar ratio of zinc to cobalt nitrate hexahydrate is 1:3, the molar ratio of zinc nitrate hexahydrate to sodium citrate is 1:2, and the molar ratio of zinc nitrate hexahydrate to hexamethylenetetram...

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Abstract

The invention provides a preparation method of a ternary composite room temperature gas-sensitive material with Au (gold) nanoparticle-loaded porous flaky ZnCo2O4 (zinc cobaltite) vertically growing on rGO (reduced graphene oxide). The preparation method specifically comprises the following steps of using GO (graphene oxide), zinc nitrate hexahydrate and cobalt nitrate hexahydrate as raw materials, using hexamethylenetetramine as an original precipitator, using trisodium citrate as a surfactant and a reducing agent, and performing water bath heating and calcining treatment, so as to obtain the porous flaky ZnCo2O4 which vertically grows on the rGO carrier; using the chloroauric acid as the raw material, loading noble metal Au nanoparticle onto the surface, and finally obtaining the ternary composite gas-sensitive material with Au nanoparticle-loaded porous flaky ZnCo2O4 vertically growing on the rGO carrier. The preparation method has the advantages that the production technology is simple; the porous flaky ZnCo2O4 which vertically grows on the rGO is prepared, and the noble metal Au nanoparticle is loaded, so as to obtain the gas-sensitive detection material with sensitive property on the NO2 (nitrogen dioxide) gas at room temperature.

Description

technical field [0001] The present invention relates to a kind of rGO / ZnCo 2 o 4 The invention relates to a method for preparing a ternary composite room-temperature gas-sensitive material of Au, belonging to the technical field of advanced nanometer material preparation technology. Background technique [0002] Most of the gas-sensing materials used in current gas sensors are metal-oxide-semiconductor gas-sensing materials, but metal-oxide-semiconductors do not have room temperature conductivity, their carrier mobility is low, and their comparative area is small, resulting in low utilization. Under normal circumstances, it needs to be heated to 70~250 ℃ to work. Therefore, developing a gas sensor with high electron mobility, large specific surface area and working at room temperature is a feasible method to break through the bottleneck of semiconductor sensor development. Graphene, as a carbon material with a single atomic layer thickness and a two-dimensional honeycomb ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00B82Y30/00
CPCG01N33/0004B82Y30/00
Inventor 马振壬宋鹏王琦李嘉杨中喜
Owner UNIV OF JINAN
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