Single particle sensitive gas sensor and preparation method and application thereof

A gas sensor and sensor technology, used in instruments, scientific instruments, measuring devices, etc., can solve the problems of reduced sensitivity, response recovery time as high as several to tens of minutes, and unfavorable improvement and stability of gas sensing performance of sensors.

Active Publication Date: 2019-07-19
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, semiconductor gas sensors often need to work at a higher temperature, but continuous high temperature work will destroy the crystal structure of the semiconductor material, resulting in unstable sensor performance.
[0003] At present, ultraviolet enhancement and inhibition of the growth of sensitive particles are common ways to improve the above problems. Among them, ultraviolet enhancement mainly uses ultraviolet light to excite sensitive materials instead of heating elements to thermally excite materials. This method can improve the room temperature gas-sensing properties of sensitive materials. and normal temperature conductivity; but its response recovery time is as high as several to tens of minutes, and the sensitivity is greatly reduced
At the same time, inhibiting the growth of a single sensitive particle is mainly achieved by preparing a hierarchical structure, but from the preparation of the hierarchical structure to the preparation of the sensor, operations such as spin coating or coating are required to form a sensitive material film layer, which is usually due to particles A dense film is formed by the aggregation of the sensor, which is not conducive to the improvement and stability of the gas sensing performance of the sensor
[0004] On the basis of the above, the existing technology solves the problem of the growth of a single sensitive particle by preparing a single nanoparticle to construct a gas sensor; in the process of preparing a single nanoparticle gas sensor, focused ion beam deposition is mainly used to achieve electrode deposition control, or by means of contact AFM is used to realize the control of sensitive materials, so as to realize the contact between sensitive materials and electrodes, but the equipment used in the method is more expensive and the operation is more complicated

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  • Single particle sensitive gas sensor and preparation method and application thereof
  • Single particle sensitive gas sensor and preparation method and application thereof
  • Single particle sensitive gas sensor and preparation method and application thereof

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preparation example Construction

[0030] The invention provides a method for preparing a single particle sensitive gas sensor, comprising the following steps (such as figure 2 shown):

[0031] Provide the sensor substrate;

[0032] Depositing a single particle on the surface of the sensor substrate by a single particle capture method to form a single particle sensitive layer to obtain a single particle sensitive gas sensor precursor;

[0033] The single particle sensitive gas sensor precursor is annealed to obtain a single particle sensitive gas sensor.

[0034] In the present invention, unless otherwise specified, all raw materials are commercially available products well known to those skilled in the art.

[0035] The present invention provides a sensor substrate. In the present invention, the preparation method of the sensor substrate preferably includes the following steps:

[0036] After depositing the polymer fiber sacrificial layer and the electrode material layer sequentially on the sensor substra...

Embodiment 1

[0061] Mix 0.8 g of polyvinylpyrrolidone and 10 mL of ethanol, and stir in a magnetic stirrer until a uniform solution is formed to obtain an electrospinning solution;

[0062] The electrospinning solution was placed in a syringe, and an orderly arranged polyvinylpyrrolidone fiber sacrificial layer was deposited on the nitrided silicon wafer by an electric field-assisted ordered electrospinning method (conditions of the electric field-assisted ordered electrospinning method : the distance between the needle of the syringe and the silicon chip is 10cm, and the voltage is 11kV; the liquid supply flow rate of the syringe is 0.3mL / h; the parallel electrode voltage of the electric field is 0.5kV, and the distance between the parallel electrodes is 1cm);

[0063] Using magnetron sputtering to sequentially deposit the underlying metal tantalum (5nm in thickness) and gold (50nm in thickness) to form an electrode material layer;

[0064] Place the above-mentioned sensor substrate depos...

Embodiment 2

[0069] Mix 0.6 g of polyvinyl alcohol and 10 mL of ethanol, and stir in a magnetic stirrer until a uniform solution is formed to obtain an electrospinning solution;

[0070] The electrospinning solution was placed in a syringe, and an orderly arranged polyvinyl alcohol fiber sacrificial layer was deposited on the nitrided silicon wafer by an electric field-assisted ordered electrospinning method (conditions of the electric field-assisted ordered electrospinning method : the distance between the needle of the syringe and the silicon wafer is 13cm, and the voltage is 10.5kV; the liquid supply flow rate of the syringe is 0.2mL / h; the parallel electrode voltage of the electric field is -0.1kV, and the distance between the parallel electrodes is 0.5cm);

[0071] The underlying metal tantalum (thickness is 10nm) and platinum (thickness is 100nm) are sequentially deposited by magnetron sputtering;

[0072] Place the above-mentioned sensor substrate deposited with the polyvinyl alcoho...

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Abstract

The invention relates to the technical field of gas sensors, in particular to a single particle sensitive gas sensor and preparation method and application thereof. The single particle sensitive gas sensor preparation method includes the following steps that a sensor substrate is provided; a single particle capturing method is adopted to enable single particles to be deposited on the surface of the sensor substrate, and a single particle sensitive gas sensor precursor is obtained; and the single particle sensitive gas sensor precursor is annealed to obtain a single particle sensitive gas sensor. According to the preparation method, the cost is low, and the operation is easy; the single particle sensitive gas sensor prepared by the preparation method can avoid particle aggregation and particle growth, thus structural advantages of nanoparticles are given full play, the specific surface area can be increased, sensitivity is improved, and the single particle sensitive gas sensor is contribute to the response and restore rate during gas adsorption and desorption on the surface; and the instability problem caused by the particle aggregation and secondary growth of the particles is solved.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a single particle sensitive gas sensor and its preparation method and application. Background technique [0002] Due to the characteristics of large specific surface area and rich surface defects, nanomaterials are widely used in gas sensors. Generally, semiconductor gas sensors need to work at a higher temperature, but continuous high temperature work will damage the crystal structure of the semiconductor material, resulting in unstable performance of the sensor. [0003] At present, ultraviolet enhancement and inhibition of the growth of sensitive particles are common ways to improve the above problems. Among them, ultraviolet enhancement mainly uses ultraviolet light to excite sensitive materials instead of heating elements to thermally excite materials. This method can improve the room temperature gas-sensing properties of sensitive materials. And normal temperature cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 范祥祥徐亚娟贺无名黄旭曾梦佳
Owner HUZHOU TEACHERS COLLEGE
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