NiO nanoparticle gas sensor element based on Cr doping, preparation method and application thereof

A gas sensor and nanoparticle technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of limited gas sensing performance, low sensitivity, poor selectivity, etc., and achieve the effect of improving gas sensing performance, low cost, and easy operation.

Active Publication Date: 2021-07-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]However, the existing VOCs gas sensors have limited gas sensing performance, high working temperature, low sensitivity, poor selectivity, poor mechanical stability, etc., which seriously restrict it. practical application of

Method used

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  • NiO nanoparticle gas sensor element based on Cr doping, preparation method and application thereof
  • NiO nanoparticle gas sensor element based on Cr doping, preparation method and application thereof
  • NiO nanoparticle gas sensor element based on Cr doping, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1. Preparation of a gas sensor element using NiO nanoparticles as a gas-sensitive material

[0068] Prepare a gas sensor element using NiO nanoparticles as a gas-sensitive material according to the following steps:

[0069] (1) Ultrasonic cleaning with water, ethanol and acetone in sequence figure 1 The surface of the flat substrate shown is dried at 60°C;

[0070] (2) Add 30mL deionized water, 0.475g nickel chloride hexahydrate, 0.28g hexamethylenetetramine into a 50mL beaker, stir for 15min, add 2mL ethanolamine, and continue stirring for 20min to obtain a mixed solution. Under hydrothermal reaction for 8 hours, after cooling to room temperature, the NiO precursor was obtained by centrifugal washing and drying;

[0071] (3) The NiO precursor prepared in step (2) is then calcined in a muffle furnace. The calcination conditions are as follows: from room temperature to 500°C at a heating rate of 5°C / min, kept for 3h, and then naturally cooled to At room temper...

Embodiment 2

[0075] Embodiment 2, preparing the gas sensor element with 15% Cr-NiO nanoparticles as the gas sensitive material

[0076] Prepare a gas sensor element using 15% Cr-NiO nanoparticles as a gas-sensing material according to the following steps:

[0077] (1) Ultrasonic cleaning with water, ethanol and acetone in sequence figure 1 The surface of the flat substrate shown is dried at 60°C;

[0078] (2) Add 30 mL of deionized water, 0.475 g of nickel chloride hexahydrate, 0.080 g of chromium trichloride hexahydrate, 0.28 g of hexamethylenetetramine into a 50 mL beaker, stir for 15 min, add 2 mL of ethanolamine, and continue stirring for 20 min to obtain The mixed solution, the above solution was hydrothermally reacted at 180°C for 8 hours, cooled to room temperature, washed and dried by centrifugation to obtain the Cr-NiO precursor;

[0079] (3) Then, the Cr-NiO precursor prepared in step (2) was calcined in a muffle furnace. The calcination conditions were as follows: the temperat...

Embodiment 3

[0083] Example 3, preparation of a gas sensor element with 20% Cr-NiO nanoparticles as a gas-sensitive material

[0084] Prepare a gas sensor element using 20% ​​Cr-NiO nanoparticles as a gas-sensing material according to the following steps:

[0085] (1) Ultrasonic cleaning with water, ethanol and acetone in sequence figure 1 The surface of the flat substrate shown is dried at 60°C;

[0086] (2) Add 30 mL of deionized water, 0.475 g of nickel chloride hexahydrate, 0.107 g of chromium trichloride hexahydrate, 0.28 g of hexamethylenetetramine into a 50 mL beaker, stir for 15 min, add 2 mL of ethanolamine, and continue stirring for 20 min to obtain The mixed solution, the above solution was hydrothermally reacted at 180°C for 8 hours, cooled to room temperature, washed and dried by centrifugation to obtain the Cr-NiO precursor;

[0087] (3) The Cr-NiO precursor prepared in step (2) was calcined in a muffle furnace. The calcination conditions were: from room temperature to 500 ...

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Abstract

The invention discloses a NiO nanoparticle gas sensor based on Cr doping, a preparation method and application thereof. According to the gas sensor element disclosed by the invention, Cr-doped NiO nano-particles are used as a gas sensitive material, the particle size of the Cr-doped NiO nano-particles is 5 to 10 nm, and in terms of atomic percentage, the doping amount of Cr in the Cr-doped NiO nanoparticles is 0-35%, but not 0, preferably 20-30%, and more preferably 25%. According to the invention, the gas sensor has excellent performance to benzene series at a low temperature, the lowest detection concentration to aniline, trimethylbenzene, methylbenzene and benzyl mercaptan is smaller than 1 ppm, the response value to benzyl mercaptan at 100 ppb reaches 10.8, ppb-level high-sensitivity detection can be achieved, and the sensor has huge application prospects in the fields of environmental monitoring, essence manufacturing, preparation of herbicides and insecticides, synthesis of sulphide ore flotation reagents and the like.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a Cr-doped NiO nanoparticle gas sensor element and its preparation method and application. Background technique [0002] VOCs, Volatile Organic Compounds (VOCs), when the concentration of VOCs in the human environment reaches a certain level, it will cause damage to the human immune system, respiratory system, endocrine system and nervous system, and seriously endanger people's health. Therefore, it is of great and urgent significance to manufacture high-performance VOCs gas sensors for environmental monitoring and human health protection. Among many types of gas sensors, the metal oxide semiconductor gas sensor uses the interaction between the gas to be measured and the gas-sensitive material to cause a change in conductivity to analyze the type and concentration of the gas. It has the advantages of low cost, easy preparation, low With the advantages of power co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127Y02A50/20
Inventor 宋卫国李佩佩曹昌燕
Owner INST OF CHEM CHINESE ACAD OF SCI
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