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A preparation method of grid-like zno helical porous hollow nanowire sensor

A hollow nanometer and wire sensor technology, which is applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of complicated ZnO nanocolumn/nanowire preparation process, long sensor response time, and long propagation path, so as to reduce the complexity of the process , shorten the transmission distance, and reduce the production cost

Active Publication Date: 2020-12-01
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The preparation process of ZnO nanocolumns / nanowires is more complicated and the cost is higher;
[0006] 2. Vertically distributed ZnO nanocolumns / nanowires have a longer propagation path for electrical signals and a longer sensor response time

Method used

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  • A preparation method of grid-like zno helical porous hollow nanowire sensor

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Experimental program
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Effect test

Embodiment 1

[0032] Zn(NO 3 ) 2 4H 2 O, Zn(CH 2 COO) 2 4H 2 O and Al(NO 3 ) 3 ·6H 2 0, mix evenly, dissolve in deionized water, take a certain amount of molecular weight polyvinylpyrrolidone (PVP (K40)) of 2000, stir at room temperature for 30min, leave standstill to obtain spinning solution, wherein the spinning solution The concentration of PVP is 40wt%, and the concentration of inorganic salt is 10wt%;

[0033] Use electrospinning on ITO conductive glass to prepare grid-like helical inorganic / PVP precursor fibers. The grid is square and the side length is 1000nm;

[0034] Transfer the precursor fibers to a box-type resistance furnace, then raise the temperature to 600°C at a heating rate of 1°C / min, and calcinate for 8 hours to obtain grid-shaped ZnO spiral porous hollow nanowires;

[0035] A gas sensor can be obtained by coating Au-conducting electrodes around the grid-shaped ZnO helical porous hollow nanowires and leading out wires.

[0036] The structure of the resulting ga...

Embodiment 2

[0038] Zn(NO with mass ratio of 1:1:0.015 3 ) 2 4H 2 O, Zn(CH 2 COO) 2 4H 2 O and Al(NO 3 ) 3 ·6H 2 0, mix evenly, dissolve in deionized water, take a certain amount of molecular weight polyvinylpyrrolidone (PVP (K40)) of 30000, stir at room temperature for 60min, leave standstill to obtain spinning solution, wherein the spinning solution The concentration of PVP is 45wt%, and the concentration of inorganic salt is 10wt%;

[0039] Use electrospinning on ITO conductive glass to prepare grid-like helical inorganic / PVP precursor fibers. The grid is square and the side length is 1000nm;

[0040] Transfer the precursor fibers to a box-type resistance furnace, then raise the temperature to 600°C at a heating rate of 1°C / min, and calcinate for 8 hours to obtain grid-shaped ZnO spiral porous hollow nanowires;

[0041] A gas sensor can be obtained by coating Au-conducting electrodes around the grid-shaped ZnO helical porous hollow nanowires and leading out wires.

Embodiment 3

[0043] Zn(NO with a mass ratio of 1:2:0.023 ) 2 4H 2 O, Zn(CH 2 COO) 2 4H 2 O and Al(NO 3 ) 3 ·6H 2 0, mix evenly, dissolve in deionized water, take a certain amount of molecular weight polyvinylpyrrolidone (PVP (K40)) of 50000, stir at room temperature for 90min, leave standstill to obtain the spinning solution, wherein the spinning solution The concentration of PVP is 50wt%, and the concentration of inorganic salt is 10wt%;

[0044] Use electrospinning on ITO conductive glass to prepare grid-like helical inorganic / PVP precursor fibers. The grid is square and the side length is 1000nm;

[0045] Transfer the precursor fibers to a box-type resistance furnace, then raise the temperature to 600°C at a heating rate of 1°C / min, and calcinate for 8 hours to obtain grid-shaped ZnO spiral porous hollow nanowires;

[0046] A gas sensor can be obtained by coating Au-conducting electrodes around the grid-shaped ZnO helical porous hollow nanowires and leading out wires.

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Abstract

The invention discloses a method for preparing a grid-like ZnO spiral porous hollow nanowire sensor. The method uses a spinning solution as a raw material, first prepares a precursor on an ITO conductive glass by electrospinning, then transfers the precursor to an electric resistance furnace for calcination to obtain grid-like ZnO spiral porous hollow nanowires, coating an Ag or Au electrode or conductive glue around the grid-like ZnO spiral porous hollow nanowires, and drawing out a conduction wire to obtain a gas sensor with a finished structure. The method has the advantages of good controllability, simple process, low cost and high sensitivity.

Description

technical field [0001] The invention belongs to the technical field of sensor preparation, and mainly relates to a method for preparing a grid-shaped ZnO helical porous hollow nanowire sensor. Background technique [0002] Sensor is a very important field in today's scientific development, and it can play an active role in smart home, safe production, environmental protection, national defense and other fields. Therefore, high-performance sensors have always been the goal of researchers. Si has the advantages of mature preparation process, low cost, and large size, so Si-based sensors have attracted widespread attention. In order to realize Si-based sensors, people generally obtain Si nano-arrays on Si substrates by etching high-quality Si substrates, and then add Au electrodes and lead out Au lines to form a complete sensor structure. [0003] However, the minimum detection limit of Si nano-array sensors is generally 100ppm, which is far lower than that of other semicondu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 杨为家何鑫刘均炎蒋庭辉梁萍刘俊杰刘铭全刘艳怡王诺媛方智仁
Owner WUYI UNIV