Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Carbon nanotube/titanium dioxide composite film and preparation method and application thereof

A technology of nano-titanium dioxide and titanium dioxide, which is applied in the field of gas sensors, can solve the problems of complex preparation process of composite materials and low sensitivity of composite material conductivity sensors, and solve the problems of resistance drifting with the number of cycles, rapid recovery and complete recovery, and improvement The effect of sensitivity

Active Publication Date: 2020-07-10
ZHENGZHOU UNIV +1
View PDF15 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above method uses carbon nanotube powder as a carrier. On the one hand, it involves the treatment of carbon nanotubes. How to ensure its dispersibility complicates the preparation process of the composite material. On the other hand, the conductivity of the prepared composite material and its sensitivity as a sensor are lower

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Carbon nanotube/titanium dioxide composite film and preparation method and application thereof
  • Carbon nanotube/titanium dioxide composite film and preparation method and application thereof
  • Carbon nanotube/titanium dioxide composite film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] Such as figure 1 Shown, a kind of preparation method of carbon nanotube / titanium dioxide composite film comprises the following steps:

[0032] (1) Self-supporting, substrate-free and continuous single-walled carbon nanotube film prepared by chemical vapor deposition, the single-walled carbon nanotube film is tiled on a support ring, and the support ring is a circular copper ring;

[0033] Chemical vapor deposition uses xylene as a carbon source and ferrocene as a catalyst to grow carbon nanotubes in a tube furnace at 1200°C in a hydrogen-argon mixed gas environment to prepare single-walled carbon nanotube films; the prepared single-walled carbon nanotubes The tube film is self-supporting, has good mechanical strength, and does not need a substrate to ensure that the film remains intact during the subsequent in-situ hydrolysis process;

[0034] (2) Tetrabutyl titanate and ethanol are uniformly mixed at a volume ratio of 1:5 to obtain a mixed solution, and the circular ...

Embodiment 1

[0041] The single-walled carbon nanotube film was prepared by chemical vapor deposition, and the film was flattened on the copper ring, put into the mixed solution of tetrabutyl titanate and ethanol (1:5) and then taken out, and then hydrolyzed in situ in the air , and then washed with ethanol and deionized water in turn, and calcined in a tube furnace at 500°C for 180 minutes under an argon atmosphere, and assembled the obtained thin film into a device and put it into CGS-TP1 for testing. After the resistance was stable, inject 20ppm NO The gas is maintained (about 1800s), then it is exposed to the air, and after the resistance is stable (about 5500s), it is irradiated with ultraviolet light.

Embodiment 2

[0048] The single-walled carbon nanotube film was prepared by chemical vapor deposition, and the film was flattened on the copper ring, put into the mixed solution of tetrabutyl titanate and ethanol (1:5) and then taken out, and then hydrolyzed in situ in the air , and then washed with ethanol and deionized water in turn, and calcined in a tube furnace at 500 ° C for 180 min in an argon atmosphere, and assembled the obtained film into a device and put it into a CGS-TP1 for testing. After the resistance was stable (about 600 s), open The gas of 50ppm NO was kept (about 1800s), and then it was exposed to ultraviolet light in the air.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a carbon nanotube / titanium dioxide composite film and a preparation method and application thereof. The carbon nanotube / titanium dioxide composite film comprises a single-walledcarbon nanotube film, the single-walled carbon nanotube film is of a network structure composed of staggered carbon nanotubes, the surfaces of the carbon nanotubes are coated with a coaxial titaniumdioxide layer, and the titanium dioxide layer is composed of a plurality of nano titanium dioxide spheres. The flexible carbon nanotube titanium dioxide composite film is assembled through in-situ hydrolysis and high-temperature calcination and has high sensitivity and excellent selectivity to NO at room temperature and simplifies the preparation process and can realize rapid recovery and completerecovery and has good stability.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a carbon nanotube / titanium dioxide composite film and its preparation method and application. Background technique [0002] With the development of technology and informatization, gas sensors are used in environmental monitoring, industrial production and our daily life. As a poisonous and harmful gas, nitric oxide poses a huge threat to our human body itself and the ecological environment. Even if healthy people are exposed to NO gas for a short period of time, it will also irritate the human respiratory tract. At present, NO sensors are mainly based on semiconductor metal oxides. Due to their high sensitivity, fast response and recovery, they have received widespread attention. However, they often have excellent gas sensing performance at high temperatures, and the room temperature response is often not satisfactory People are satisfied. Carbon nanotubes can respond quick...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28G01N27/12B01D53/02B01J20/30
CPCB01J20/20B01J20/06B01J20/28033B01D53/02G01N27/125G01N27/127B01D2257/404Y02A50/20
Inventor 上媛媛常书龙庞瑞曹安源
Owner ZHENGZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com