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Gas sensor based on nickel sulfide nano composite material and preparation method of gas sensor

A technology of nanocomposite materials and gas sensors, applied in chemical instruments and methods, nickel sulfide, analytical materials, etc., can solve the problems of poor timeliness and low sensitivity

Active Publication Date: 2019-07-05
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the prior art, and to design a gas sensor based on nickel sulfide nanocomposites and its preparation method for the existing laboratory monitoring methods, the shortcomings of poor timeliness and low sensitivity

Method used

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  • Gas sensor based on nickel sulfide nano composite material and preparation method of gas sensor
  • Gas sensor based on nickel sulfide nano composite material and preparation method of gas sensor

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Embodiment 1

[0060] The gas sensor based on the nickel sulfide nanocomposite material that this embodiment relates to, its main structure comprises the Al with 2 discrete annular gold electrodes on the outer surface. 2 o 3 Insulating ceramic tube, through Al 2 o 3 The nickel-cadmium alloy coil inside the insulating ceramic tube and the Al-coated 2 o 3 The outer surface of the insulating ceramic tube and the sensitive material film on the ring gold electrode are composed of NiS nanocomposite material.

[0061] The preparation method of the gas sensor based on the nickel sulfide nanocomposite material involved in this embodiment includes: thoroughly grinding the NiS nanocomposite material in an agate mortar to obtain a pasty gas-sensitive paste, and then evenly coating the gas-sensitive paste on the Al of the gas sensor 2 o 3 Finally, vacuum-dry at 60°C overnight to prepare a gas sensor of nickel sulfide nanocomposite.

[0062] The specific preparation process of the NiS nanocomposite...

Embodiment 2

[0067] The gas sensor based on nickel sulfide nanocomposites involved in this embodiment is specifically NiS@In 2 o 3 Gas sensor, NiS@In 2 o 3 The main structure of the gas sensor consists of Al with 2 discrete annular gold electrodes on the outer surface 2 o 3 Insulated ceramic tube 1, passing through Al 2 o 3 The nickel-cadmium alloy coil 2 inside the insulating ceramic tube and coated in Al 2 o 3 The outer surface of the insulating ceramic tube and the sensitive material film 3 on the annular gold electrode, the sensitive material is NiS@In 2 o 3 nanocomposites.

[0068] The NiS@In involved in this embodiment 2 o 3 The preparation method of the gas sensor, the specific process steps are as follows:

[0069] Step 1: Prepare NiS nanofibers: Ni(NO 3 ) 2 NiS nanofibers were prepared by electrospinning technology combined with hydrogen sulfide calcination; the specific steps are as follows:

[0070] (1) The PVP of 2.2g is dissolved in the DMF solvent of 20ml, and ...

Embodiment 3

[0088] In this example, three groups of NiS@In prepared in Example 2 2 o 3 Gas sensor performance test, the In 2 o 3 Grind thoroughly in an agate mortar to prepare a paste-like gas-sensitive paste; then apply the gas-sensitive paste evenly on the gas sensor Al 2 o 3 ceramic tube 1 and dried under vacuum at 60 °C overnight to obtain In 2 o 3 gas sensor, the In 2 o 3 Gas sensor with NiS@In 2 o 3 The performance of the gas sensor is tested by comparative experiments; here, the gas response range of the gas sensor is defined as S=R a / R g , where R a is the resistance in air, R g is the resistance in the gas to be measured, and in addition, the response or recovery time is 90% of the time it takes for the gas sensor output to reach its saturated state after the gas is applied or turned off.

[0089] Such as figure 2 As shown, the In 2 o 3 Gas sensor, 60%NiS@40%In 2 o 3 Gas sensor, 70%NiS@30%In 2 o 3 Gas sensor and 80%NiS@20%In 2 o 3 The gas sensor measures the...

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Abstract

The invention belongs to the technical field of gas sensors, and relates to a gas sensor based on a nickel sulfide nano composite material and a preparation method of the gas sensor. The outer surfaceof a Al2O3 insulating ceramic tube of the sensor and an annular gold electrode are coated with a NiS nano composite material film. The preparation process of the sensor comprises the steps that firstly, Ni(NO3)2 is prepared into NiS nanofibers through a method combining an electrospinning technology and hydrogen sulfide calcination, then a metal compound is prepared into semiconductor metal oxidenanofibers through the electrospinning technology, then NiS and a semiconductor metal oxide nano composite material are mixed, calcined and subjected to solid grinding to prepare a NiS nano compositematerial, finally, the NiS nano composite material is grinded to prepare pasty air-sensitive paste, and the air-sensitive paste is applied on the gas sensor to prepare the gas sensor made from the nickel sulfide nano composite material. The gas sensor has good response performance to ethyl alcohol, high sensitivity, good selectivity, high response and recovery rate and good long-term stability.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of gas sensors, and relates to a gas sensor with high gas response and selectivity, in particular to a gas sensor based on a nickel sulfide nanocomposite material and a preparation method thereof. [0003] Background technique: [0004] Ethanol is a colorless liquid with a wine aroma, its vapor pressure reaches 5.33kPa / 19°C, its melting point is 114.1°C, and its boiling point is 78.3°C. It is miscible in most organic solvents such as ether, chloroform, glycerin, etc. Miscible; the relative density of water is 0.79, and the relative density of air is 1.59. It is a flammable liquid, mainly used in wine making industry, organic synthesis, disinfection and as a solvent, widely used in all aspects of life. However, everything has two sides. Because ethanol is volatile, its vapor and air can form explosive mixtures, which can easily cause combustion and explosion when exposed to open flames and high heat....

Claims

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Application Information

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IPC IPC(8): C01G53/11C01G15/00G01N27/12
CPCC01G15/00C01G53/11C01P2004/16G01N27/125G01N27/127
Inventor 谢万峰黄昕宇孟玉范淋关延峰袁子童李浩
Owner QINGDAO UNIV
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