Preparation methods of spheroidic tungsten trioxide sensitive material and sulfur dioxide gas sensor and evaluation method

A gas sensor, tungsten trioxide technology, used in material resistance, material analysis, material analysis using radiation diffraction, etc., can solve problems such as endangering the personal safety of operation and maintenance personnel, reducing equipment insulation performance, discharge and overheating, etc., to achieve excellent The effect of gas-sensing properties

Pending Publication Date: 2020-12-18
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] SF 6 Gas-insulated equipment may have various defects during manufacture, installation or operation, and these defects will cause faults such as discharge and overheating, which will lead to SF after the fault occurs 6 T

Method used

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  • Preparation methods of spheroidic tungsten trioxide sensitive material and sulfur dioxide gas sensor and evaluation method
  • Preparation methods of spheroidic tungsten trioxide sensitive material and sulfur dioxide gas sensor and evaluation method
  • Preparation methods of spheroidic tungsten trioxide sensitive material and sulfur dioxide gas sensor and evaluation method

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Experimental program
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Effect test

Example Embodiment

[0055]The preparation method of the spherical tungsten trioxide sensitive material provided by the present invention will now be described. The preparation method of the spherical tungsten trioxide sensitive material includes:

[0056]Step 1: Put tungsten hexachloride into a container, add absolute ethanol, and stir to form a solution;

[0057]Step two: adding diammonium hydrogen citrate to the solution and stirring to form a suspension;

[0058]Step 3: Transfer the suspension into an autoclave, heat and react for a certain period of time, and cool naturally to obtain a product precursor;

[0059]Step 4: Collect the product precursors and wash them with deionized water and absolute ethanol;

[0060]Step 5, vacuum drying the washed product precursor;

[0061]The dried product precursor is heated and sintered in a muffle furnace to obtain a spherical tungsten trioxide sensitive material.

[0062]Compared with the prior art, the method for preparing the spherical tungsten trioxide sensitive material provid...

Example Embodiment

[0082]Example 1, a kind of SF based on spherical tungsten trioxide sensitive material6Decomposition product sulfur dioxide gas sensor, at different temperatures (20±1℃~250±2℃) for 100±1μL / L SO2The detection:

[0083]Step one, turn on the precision digital multimeter, programmable DC power supply and computer. Open the software "Fluke" on the computer and set to collect once every 1s. Plug the manufactured sulfur dioxide gas sensor into the test socket, you can immediately see the real-time resistance of the sulfur dioxide gas sensor on the display screen of the precision digital multimeter, and you can see the resistance change curve on the software window. Adjust the output current value of the programmable DC power supply, change the temperature of the sulfur dioxide gas sensor, and stabilize the resistance. Record the resistance R at this timea, Heating current and voltage.

[0084]Step 2: Fill a 1L static gas cylinder with 10±0.1mL SO using a syringe2Gas (the target gas concentration ...

Example Embodiment

[0086]Example 2, SF based on spherical tungsten trioxide sensitive material6Decomposition product sulfur dioxide gas sensor, at different temperatures (20±1℃~250±2℃), for 100μL / L SO2, NH3, Ethanol, methanol, n-butanol and acetone detection:

[0087]Step one, turn on the precision digital multimeter, programmable DC power supply and computer. Open the software "Fluke" on the computer and set to collect once every 1s. Insert the manufactured sulfur dioxide gas sensor into the test socket, you can immediately see the real-time resistance of the sulfur dioxide gas sensor on the display screen of the precision digital multimeter, and the resistance change curve can also be seen on the software window. Adjust the output current value of the programmable DC power supply to make the heating temperature 105±1℃. Record the resistance R at this timea, Heating current and voltage.

[0088]Step 2: Configure 100±1μL / L of SO in a static gas cylinder with a specification of 1L.2, NH3, Ethanol, methanol, ...

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Abstract

The invention provides preparation methods of a spheroidic tungsten trioxide sensitive material and a sulfur dioxide gas sensor and a gas sensitive sensing performance evaluation method. The preparation method of the spheroidic tungsten trioxide sensitive material comprises the following steps: putting tungsten hexachloride into a container, adding absolute ethyl alcohol, and performing stirring to form a solution; adding diammonium hydrogen citrate into the solution, and performing stirring to form turbid liquid; transferring the turbid liquid into a high-pressure reaction kettle, performingheating to react for a certain time, and naturally performing cooling to obtain a product precursor; collecting the product precursor, and performing washing with deionized water and absolute ethyl alcohol respectively; carrying out vacuum drying on the washed product precursor; and heating and sintering the dried product precursor in a muffle furnace to obtain the spheroidic tungsten trioxide sensitive material. According to the spheroidic tungsten trioxide sensitive material provided by the invention, diammonium hydrogen citrate is added for the first time, and the morphology of the productis regulated and controlled, so that the spheroidic tungsten trioxide sensitive material is assembled into a sphere-like shape with more pores, and the constructed gas sensor has excellent gas sensitivity to gas SO2 decomposed by SF6.

Description

technical field [0001] The invention belongs to the technical field of metal oxide semiconductor sensors, and more specifically, relates to a preparation method of a spherical tungsten trioxide sensitive material, a preparation method of a sulfur dioxide gas sensor based on a spherical tungsten trioxide sensitive material, and a sulfur dioxide gas sensor based on a spherical tungsten trioxide sensitive material. Evaluation method of gas sensor performance. Background technique [0002] SF 6 Gas-insulated equipment may have various defects during manufacture, installation or operation, and these defects will cause faults such as discharge and overheating, which will lead to SF after the fault occurs 6 The gas decomposes to produce H 2 S, SO 2 、SOF 2 Such characteristic gases and other impurity gases will reduce the insulation performance of the equipment and endanger the personal safety of operation and maintenance personnel. [0003] Research at home and abroad shows th...

Claims

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Application Information

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IPC IPC(8): G01N27/12G01N23/20
CPCG01N27/129G01N23/20
Inventor 张立军刘克成夏彦卫高燕宁韩鹤松石荣雪任汉涛
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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