Production method of gold-doped vanadium dioxide nanosheet structured room temperature CH4 gas-sensitive sensor

A vanadium dioxide nanometer and gas sensor technology, which is applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of high sensor operating temperature, short response recovery time, and inability to realize low-concentration detection, and achieve short response recovery time , easy to operate, beneficial to the effect of adsorption and diffusion

Inactive Publication Date: 2016-12-21
TIANJIN UNIV
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Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a kind of gold-doped vanadium dioxide nanosheet structure room temperature CH 4 The preparation method of the gas sensor overcomes the problems of the high working temperature of the current sensor, the short response recovery time, and the inability to realize low-concentration detection

Method used

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  • Production method of gold-doped vanadium dioxide nanosheet structured room temperature CH4 gas-sensitive sensor
  • Production method of gold-doped vanadium dioxide nanosheet structured room temperature CH4 gas-sensitive sensor
  • Production method of gold-doped vanadium dioxide nanosheet structured room temperature CH4 gas-sensitive sensor

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Experimental program
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Effect test

Embodiment 1

[0031] (1) Cleaning of ceramic substrates

[0032] Cut a ceramic sheet with a size of 2cm*2cm into two rectangular pieces with a size of 2cm*1cm, then put a complete and a cut ceramic sheet into a glass, and ultrasonically clean them in acetone and ethanol respectively for 5 ~20 minutes, after cleaning, take out the ceramic substrate and blow off the liquid on the surface of the substrate with a suction ball, after absorbing the liquid, put it on the filter paper and dry it in a vacuum oven at 60-80°C for 5-10 minutes for later use;

[0033] (2) Weigh V 2 o 5 powder

[0034] Weigh 0.15g V 2 o 5 powder spare;

[0035] (3) Preparation of vanadium dioxide nanosheets by single gas phase transport method

[0036] V of step (2) 2 o 5 Spread the powder evaporation source evenly on the 2cm*2cm ceramic substrate in step (1), and put it into the quartz tube as a whole, and then place it at a distance of V 2 o 5 Place a 2cm*1cm ceramic substrate in step (1) at 0.5cm of the powd...

Embodiment 2

[0045] The difference between this embodiment and Example 1 is: the deposition pressure of the vanadium dioxide nanosheets in step (3) is 1Torr, and the gas sensor element with the gold-doped vanadium dioxide nanosheets structure is at room temperature to 500ppm CH 4 Gas sensitivity is 58%.

Embodiment 3

[0047] The difference between this embodiment and Example 1 is that the deposition pressure of vanadium dioxide nanosheets in step (3) is 2Torr, and the prepared gold-doped vanadium dioxide nanosheet structure gas sensor element is at room temperature to 500ppm CH 4 Gas sensitivity is 60%.

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Abstract

The invention discloses a production method of a gold-doped vanadium dioxide nanosheet structured room temperature CH4 gas-sensitive sensor. The method comprises the following steps: cleaning a ceramic substrate; weighing V2O5 powder; preparing vanadium dioxide nanosheets through a single vapor transportation technology; doping the surfaces of the vanadium dioxide nanosheets with gold; and producing the gold-doped vanadium dioxide nanosheet gas-sensitive sensor element. The method provided by the invention has the advantages of simplicity in operation, realization of low-cost preparation of the gold-doped vanadium dioxide nano-sheets, few control technology conditions needed by the single vapor transportation technology, and no pollution to environment. The gold-doped vanadium dioxide nano-sheets have large specific surface area and large gas diffusion channel, and are in favor of adsorbing and diffusing gases. The gold-doped vanadium dioxide nanosheet structured room temperature CH4 gas-sensitive sensor produced in the invention has the advantages of high sensitivity and short response recovery time in the detection of low-concentration CH4 gas at room temperature. The study of a gold-doped vanadium dioxide composite material in reduction of the temperature of the gas sensor and improvement of the sensitivity of the gas sensor still has great research potential.

Description

technical field [0001] The invention relates to a gas sensor element, in particular to a CH sensor suitable for working at room temperature 4 Controllable preparation method of gas sensor with gold-doped vanadium dioxide nanosheet structure. Background technique [0002] Semiconductor metal oxides have been widely used in the detection of toxic and explosive gases. Among them, tin dioxide and zinc oxide are the most studied materials. It is undeniable that they have high detection sensitivity, but high operating temperature (>200°C) limits their practical application. In order to reduce the operating temperature of the sensor, the researchers doped an appropriate amount of palladium (Pd), iron (Fe) and gold (Au) on the surface of the nanostructure. However, the operating temperature of the gas sensor based on the above-mentioned doped nanomaterials is still higher than 100 °C. Therefore, it is urgent to develop new nanomaterial gas sensors. [0003] In recent years, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 梁继然李文姣刘俊锋杨然朱奎龙
Owner TIANJIN UNIV
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