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Polyaniline/zinc oxide nanocomposite resistive material sensor and preparation method thereof

A zinc oxide nano-composite resistor technology, applied in the field of sensors, can solve problems such as limited use, potential safety hazards, and difficulties in the development and application of flexible photoelectric devices, and achieve the effects of accelerated response, low energy consumption, and easy development and application

Active Publication Date: 2018-04-03
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 nanocomposite resistive material sensor and preparation method thereof
  • Polyaniline/zinc oxide nanocomposite resistive material sensor and preparation method thereof
  • Polyaniline/zinc oxide nanocomposite resistive material sensor and preparation method thereof

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Experimental program
Comparison scheme
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 100 mg / mL, the concentration of polyvinyl alcohol is 100 mg / mL; wherein zinc acetate can be any A metal salt that can be dissolved in the spinning solution solvent and has 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 of silk, including but not limited to polyvinyl alcohol, polyvinyl acetate, polyethylene glycol, polyacrylic acid.

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

Embodiment 2

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

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

[0034] ③ drying the substrate deposited with nanofibers obtained in step ② and then hydrothermally treating it at 90° C. for 48 h to obtain a substrate with semiconductor zinc oxide nanostructures 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] ② The electrospinning solution in step ① was deposited on the glass substrate in the form of nanofibers under the electrospinning conditions of flow rate 10 mL / h; receiving distance 30 cm; spinning voltage 30 kV; receiving time 0.5 min superior;

[0039] ③ drying the substrate deposited with nanofibers obtained in step ② and then hydrothermally treating it at 120° C. for 6 h 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 relates to the field of sensors, in particular to a polyaniline / zinc oxide nanocomposite resistance gas sensor with high sensitivity at room temperature and a green preparation method thereof. Background technique [0002] With the popularization of information technology, the Internet of Things is increasingly becoming a part of our production and life, among which the link terminal between objects and the network is the most important thing, and the gas sensitive sensor based on chemical sensing is the key to provide information such as substance concentration and type. It is an important means and plays a key role in the information acquisition and transmission of the Internet of Things and processing engineering. In addition, the current environmental pollution is very serious, which has caused great harm to human health. Environmental issues have increasingly attracted people's attention, and air quality monitoring and pollution cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 李扬焦明飞杨慕杰
Owner ZHEJIANG UNIV