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An ethanol sensor based on a zinc oxide nanometer structure and a preparing method thereof

A zinc oxide nano and zinc oxide nanowire technology, applied in the field of sensors, can solve the problems of complex preparation process, low sensitivity, and long response time, and achieve the effect of simple preparation process, high sensitivity, and fast response time

Active Publication Date: 2015-06-10
纳米新能源生命科技(唐山)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the preparation method of zinc oxide nanowires, the existing ethanol sensor has defects such as low sensitivity, long response time, and complicated preparation process.

Method used

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  • An ethanol sensor based on a zinc oxide nanometer structure and a preparing method thereof
  • An ethanol sensor based on a zinc oxide nanometer structure and a preparing method thereof
  • An ethanol sensor based on a zinc oxide nanometer structure and a preparing method thereof

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Effect test

no. 1 Embodiment approach

[0069] An ethanol sensor based on a zinc oxide nanostructure, comprising two sets of electrodes forming interdigital electrodes, and a zinc oxide nanofilm arranged on at least one surface of the interdigital electrodes; the zinc oxide nanofilm is composed of a hexagonal wurtzite crystal phase Zinc oxide nanowires.

[0070] figure 1 Shown is a schematic diagram of the structure of the interdigitated electrode. The two groups of electrodes form an interdigitated shape, and the two groups of electrodes are not connected, forming the signal output end of the ethanol sensor. The interdigitated electrodes of the present invention are made by conventional methods. Specifically, electrode materials are deposited or coated on the substrate to form two groups of electrodes in the shape of interdigitated electrodes. The thickness of the interdigitated electrode of the present invention is about 50nm-100nm.

[0071] The present invention has no special regulations on the substrate use...

Embodiment 1

[0101] The size of the ethanol sensor obtained in this example is 2 cm×2 cm, the thickness of the zinc oxide nano film is 500 nm, and the diameter of the zinc oxide nanowires constituting the zinc oxide nano film is 300 nm. The preparation method of this ethanol sensor will be described below.

[0102] (1) Preparation of interdigitated electrodes

[0103] Using gold foil as a target, magnetron sputtering is used to deposit interdigitated electrodes on a silicon chip with a thickness of about 70 nanometers.

[0104] (2) Preparation of electrospinning solution for zinc oxide nano-membrane

[0105] Slowly add 22.7g of polyvinylpyrrolidone (PVP, molecular weight 1.3M) into 10ml of methylformamide (DMF), after the polyvinylpyrrolidone is dissolved, slowly add 0.9g of zinc acetate and 0.33g of SnCl 2 2H 2 O, and then mixed uniformly to obtain an electrospinning solution.

[0106] (3) Electrospinning

[0107] Add the electrospinning solution obtained in step (2) into the injecti...

Embodiment 2

[0113] The size of the ethanol sensor obtained in this example is 2 cm×2 cm, the thickness of the zinc oxide nano film is 600 nm, and the zinc oxide nano film is composed of parallel zinc oxide nanowires with a diameter of 300 nm. The preparation method of the ethanol sensor will be described below.

[0114] (1) Preparation of interdigitated electrodes

[0115] Using gold foil as a target, magnetron sputtering is used to deposit interdigitated electrodes on a silicon chip with a thickness of about 70 nanometers.

[0116] (2) Preparation of electrospinning solution for zinc oxide nano-membrane

[0117] Slowly add 22.7g of polyvinylpyrrolidone (PVP, molecular weight 1.3M) into 10ml of methylformamide (DMF), after the polyvinylpyrrolidone is dissolved, slowly add 0.9g of zinc acetate and 0.33g of SnCl 2 2H 2 O, and then mixed uniformly to obtain an electrospinning solution.

[0118] (3) Electrospinning

[0119] Add the electrospinning solution obtained in step (2) into the i...

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Abstract

An ethanol sensor based on a zinc oxide nanometer structure and a preparing method thereof are provided. The ethanol sensor comprises two electrode groups forming an interdigitated electrode and a zinc oxide nanometer film on at least one side surface of the interdigitated electrode. The zinc oxide nanometer film is formed by zinc oxide nanowires having a hexagonal wurtzite crystal phase. The two electrode groups of the interdigitated electrode are not conducted and form signal output ends of the ethanol sensor. The ethanol sensor can sense resistance reduction on the zinc oxide surface caused by ethanol absorption. The responsivity of the ethanol sensor is in approximate linear variation with the concentration of added ethanol gas in the environment.

Description

technical field [0001] The invention relates to the field of sensors, in particular to an ethanol sensor based on a zinc oxide nanostructure and a preparation method thereof. Background technique [0002] In 2006, Professor Wang Zhonglin of Georgia Institute of Technology in the United States successfully converted mechanical energy into electrical energy in the nanoscale range, and developed the world's smallest generator - nanogenerator. The basic principle of nanogenerators is that when nanowires (NWs, such as ZnO nanowires) are dynamically stretched under an external force, a piezoelectric potential is generated in the nanowire, and a corresponding transient current flows at both ends to balance the Fermi level. . [0003] ZnO nanowires, as semiconductor materials, can be used in ethanol sensors. Then the existing ethanol sensor has the defects of low sensitivity, long response time and complicated preparation process due to the preparation method of zinc oxide nanowir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 叶柏盈
Owner 纳米新能源生命科技(唐山)有限责任公司
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