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Polyaniline/zinc oxide nano composite resistor type material sensor and preparation method thereof

A zinc oxide nanometer and composite resistor technology, applied in the field of sensors, can solve the problems of hidden safety hazards, restricted use, and difficulties in the development and application of flexible optoelectronic devices, and achieve the effects of less energy consumption, accelerated response, and easy development and application.

Active Publication Date: 2015-11-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the preparation or detection of conventional zinc oxide nanomaterials usually requires high temperature treatment above 400 °C. Since flexible organic and polymer material substrates are often unable to withstand such high temperatures, it further limits its use on flexible polymer substrates. It brings difficulties to the development and application of flexible optoelectronic devices
We previously disclosed the method and application of low-temperature in-situ growth of nanostructured semiconductor metal oxides (104807859A), but the preparation process still requires the use of a large amount of organic solvents, which poses a great safety hazard. Therefore, it is important to develop a green and safe preparation process. significance

Method used

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  • Polyaniline/zinc oxide nano composite resistor type material sensor and preparation method thereof
  • Polyaniline/zinc oxide nano composite resistor type material sensor and preparation method thereof
  • Polyaniline/zinc oxide nano composite resistor type material sensor and preparation method thereof

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Effect test

Embodiment 1

[0025] The preparation method of the method of the present invention comprises the following steps:

[0026] 1. prepare the mixed solution of zinc acetate and polyvinyl alcohol, i.e. spinning solution, water is solvent, the concentration of described zinc acetate is 100mg / mL, and the concentration of polyvinyl alcohol is 100mg / mL; Wherein zinc acetate can be any energy Metal salts that are soluble in the spinning solution solvent and have good compatibility with spinning aids, including but not limited to zinc acetate, zinc nitrate, zinc chloride; polyvinyl alcohol can be any one or more spinnable Water-soluble polymers, including but not limited to polyvinyl alcohol, polyvinyl acetate, polyethylene glycol, polyacrylic acid.

[0027] ② Deposit the electrospinning solution in step ① in the form of nanofibers on the ceramic substrate under the electrospinning conditions of flow rate of 0.2mL / h; receiving distance of 13cm; spinning voltage of 13kV; receiving time of 5min; The su...

Embodiment 2

[0032] 1. prepare the mixed solution of zinc acetate and polyvinyl alcohol, i.e. spinning solution, the concentration of described zinc acetate is 10mg / mL, and the concentration of polyvinyl alcohol is 40mg / mL;

[0033] ② The electrospinning liquid in step ① is deposited on the ITO glass in the form of nanofibers under the electrospinning conditions of flow rate of 0.1mL / h; receiving distance of 5cm; spinning voltage of 5kV; receiving time of 30min;

[0034] ③ drying the substrate deposited with nanofibers obtained in step ② and then hydrothermally treating it at 90 ° C for 48 hours to obtain a substrate with a semiconductor zinc oxide nanostructure grown in situ, and the preparation method;

[0035] ④ step ③ dip-coats a layer of 30 mg / ml polyaniline on the substrate with the semiconductor zinc oxide nanostructure to prepare a gas sensor.

Embodiment 3

[0037] 1. prepare the mixed solution of zinc chloride and polyvinylpyrrolidone, i.e. spinning solution, the concentration of said zinc chloride is 300mg / mL, and the concentration of polyvinylpyrrolidone is 100mg / mL;

[0038] ②The electrospinning solution in step ① is deposited on the glass substrate in the form of nanofibers under the electrospinning conditions of flow rate of 10mL / h; receiving distance of 30cm; spinning voltage of 30kV; receiving time of 0.5min;

[0039] ③ drying the substrate deposited with nanofibers obtained in step ② and then hydrothermally treating it at 120° C. for 6 hours to obtain a substrate with semiconductor zinc oxide nanostructures grown in situ;

[0040] ④ Dip-coat a layer of 0.5 mg / ml polyaniline on the substrate prepared in step ③ with the semiconductor zinc oxide nanostructure to prepare a gas sensor.

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Abstract

The invention discloses a polyaniline / zinc oxide nano composite resistor type material sensor and a preparation method thereof. The sensor comprises a ceramic substrate, an interdigital gold electrode and a gas-sensing material which are arranged in sequence, wherein the gas-sensing material is formed by compositing nanoscale lamellar zinc oxide and nano polyaniline particles; due to large specific surface area caused by nanoscale of the material, the adsorption site of the sensitive material and gas is increased and more channels are provided, so as to promote the adsorption and diffusion of the detection gas in the gas sensor. Particularly, in the preparation process of the sensor, only water is used as a solvent, organic solvents or other additives do not need to be added to participate in reaction, thus being green and safe and having no environment pollution. The reaction temperature is relatively low, high temperature firing is not needed, energy can be saved, and the preparation method has the prominent characteristic of environment friendliness. The method for preparing the gas sensor, provided by the invention, is safe and efficient, and is simple in process and low in cost, thus being suitable for batch production.

Description

Technical field [0001] The invention involves the field of sensors, which specifically involves a polyiline / zinc oxide nano -composite resistance gas sensor and its green preparation method with high sensitivity at room temperature. Background technique [0002] With the popularization of information technology, the Internet of Things is increasingly becoming part of our production and life. Among themImportant means played a key role in the acquisition and transmission of IoT information and processing projects.In addition, the current environmental pollution is very serious, which has caused great harm to human health, and environmental problems have attracted increasing attention from the people. It has attracted widespread attention to air quality monitoring and pollution governance, which indicates that gas sensors will become increasingly important in future production and life.With the increase in environmental protection and the adjustment of the national economic structu...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 李扬焦明飞杨慕杰
Owner ZHEJIANG UNIV
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