A kind of preparation method of room temperature hydrogen sensor

A sensor and room temperature technology, applied in the field of hydrogen sensors, can solve the problems of insufficient bonding of metal oxides, insufficient catalytic performance, and restrictions on wide application, and achieve uniform and stable catalytic performance, low cost, and high sensitivity.

Inactive Publication Date: 2015-12-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In most cases, the operating temperature of the sensor can be significantly lowered but does not work well at room temperature due to the insufficient catalytic performance of palladium or platinum itself or their binding to the metal oxide.
Moreover, the modification of palladium and platinum mostly relies on expensive technologies such as thermal evaporation and magnetron sputtering, and the high cost severely limits the wide application of such materials.

Method used

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  • A kind of preparation method of room temperature hydrogen sensor
  • A kind of preparation method of room temperature hydrogen sensor
  • A kind of preparation method of room temperature hydrogen sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the room temperature hydrogen sensor described in this embodiment comprises the following steps:

[0027] 1) For conventional WO 3 The nanosheets were pretreated with 1gWO at room temperature 3 The nanosheets are loaded into a quartz crucible, which is then placed inside a muffle furnace. Start the heating program of the muffle furnace, heat from room temperature to 500 °C at a heating rate of 5 °C / min, keep at 500 °C for 2 hours, then turn off the heating program of the muffle furnace, let it cool down naturally, and after cooling down to room temperature, put the WO 3 The nanosheets are packed into sample vials for use.

[0028] The conventional tungsten trioxide nanosheets are flakes with an average side length of 150 nm and an average thickness of 30 nm. It can be synthesized in the laboratory by a simple hydrothermal method, and commercially available similar products can also be purchased.

[0029] 2) Add 0.12g palladium chloride, 1.6...

Embodiment 2

[0035] The preparation method of the room temperature hydrogen sensor described in this embodiment comprises the following steps:

[0036] 1) For conventional WO 3 The nanosheets were pretreated with 1gWO at room temperature 3 The nanosheets are loaded into a quartz crucible, which is then placed inside a muffle furnace. Start the heating program of the muffle furnace, heat from room temperature to 600 °C at a heating rate of 5 °C / min, keep at 600 °C for 2 hours, then turn off the heating program of the muffle furnace, let it cool down naturally, and after cooling down to room temperature, put the WO 3 The nanosheets are packed into sample vials for use.

[0037] The conventional tungsten trioxide nanosheets are flakes with an average side length of 150 nm and an average thickness of 30 nm. It can be synthesized in the laboratory by a simple hydrothermal method, and commercially available similar products can also be purchased.

[0038] 2) Add 0.15 g of platinum chloride, 2....

Embodiment 3

[0044] The preparation method of the room temperature hydrogen sensor described in this embodiment comprises the following steps:

[0045] 1) For regular In 2 o 3 Nanocubes were pretreated with 1gIn 2 o 3 The nanocubes are loaded into a quartz crucible, which is then placed in a muffle furnace. Start the heating program of the muffle furnace, heat from room temperature to 400 °C at a heating rate of 5 °C / min, keep at 400 °C for 2 hours, then close the heating program of the muffle furnace, let it cool down naturally, and after it drops to room temperature, put In 2 o 3 The nanocubes are packed into vials for use.

[0046] The conventional In 2 o 3 The nanocubes are indium oxide nanocubes with an average side length of 200 nm. It can be synthesized by a simple solvothermal method in the laboratory, or commercially available similar products can be purchased.

[0047] 2) Add 0.15g of platinum chloride, 1.6g of polyvinylpyrrolidone, 3.2g of sodium iodide and 20ml of deio...

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Abstract

The invention discloses a preparation method of a room-temperature hydrogen sensor, and relates to a hydrogen sensor. The preparation method comprises the steps of annealing a metal oxide; adding chloride which is palladium chloride or platinum chloride, polyvinylpyrrolidone, NaI.2H2O and deionized water in a beaker filled with dimethylformamide to obtain a brownish black solution, transferring the brownish black solution to a reaction kettle; then adding the annealed metal oxide in the reaction kettle and performing ultrasonic dispersion, sealing the reaction kettle after the metal oxide is dispersed completely, and placing at a set growth temperature, cooling the dispersed metal oxide to the room temperature when the reaction is ended, centrifuging and washing; and finally, dispersing a product in a solvent to obtain a room-temperature metal oxide hydrogen sensitive material with palladium or platinum nano particles deposited on the surface, ultrasonically dispersing the room-temperature metal oxide hydrogen sensitive material in absolute ethyl alcohol, dropping dispersed turbid liquid on a cleaned gold interdigital electrode to obtain a gas sensitive chip after alcohol is completely volatilized, and connecting the gas sensitive chip with a peripheral circuit to obtain the room-temperature hydrogen sensor.

Description

technical field [0001] The invention relates to a hydrogen sensor, in particular to a preparation method of a room temperature hydrogen sensor. Background technique [0002] Hydrogen has the characteristics of high energy density and no pollution, and is known as the most promising new energy in the 21st century. In recent years, a large number of researches related to hydrogen, such as photolysis of water, electrochemical hydrogen storage and hydrogen fuel cells, have developed rapidly. But hydrogen is a colorless, odorless and highly flammable gas, so it is very dangerous if it leaks during use. Therefore, the wide application of hydrogen energy puts forward higher requirements for hydrogen detection technology. [0003] Traditional metal oxide gas sensors can only work under high temperature conditions above 300°C. On the one hand, the power consumption of the sensor is relatively high. On the other hand, it also brings a great potential safety hazard. When the concentr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04
Inventor 王太宏刘彬蔡道平王妍蓉刘源李寒王丹丹王玲玲
Owner XIAMEN UNIV
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