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Heterojunction sensitive device, its preparation method and gas sensor containing the sensitive device

A gas sensor and sensitive device technology, applied in chemical instruments and methods, nanotechnology for sensing, instruments, etc., can solve the problems of high probability of carrier recombination, shortened response/recovery time, limited sensitivity, etc., to achieve The construction method is simple, the uniformity of device performance is guaranteed, and the effect of improving device performance

Active Publication Date: 2020-09-18
南京晶碳纳米科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when pure reduced graphene oxide is used as a gas-sensing material, due to the existence of a large number of structural defects or functional groups, the probability of carrier recombination is very high, which limits the further improvement of the sensitivity and the shortening of the response / recovery time of this type of gas-sensing devices.

Method used

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  • Heterojunction sensitive device, its preparation method and gas sensor containing the sensitive device
  • Heterojunction sensitive device, its preparation method and gas sensor containing the sensitive device
  • Heterojunction sensitive device, its preparation method and gas sensor containing the sensitive device

Examples

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Effect test

Embodiment 1

[0051] Magnetic Fe with a diameter of 500 nm 3 o 4 @SiO 2 The core-shell structure submicron sphere is used as the support body, and the electrostatic self-assembly method is used to build the magnetic Fe 3 o 4 @SiO 2 Carboxylated multi-walled carbon nanotubes assembled on the surface of submicron spheres with core-shell structure, the assembly time is 1 hour; then, the magnetic submicron spheres wrapped with carboxylated carbon nanotubes on the surface are put into graphene oxide dispersion liquid for stirring and assembly , the assembly time is 12 hours; the three-dimensional magnetic carbon nanotube / reduced graphene oxide heterojunction gas-sensing material is dispersed in isopropanol solution, and the above-mentioned sensitive material with a concentration of 0.2mg / mL is solution in a transverse magnetic field with a strength of 2000 Gauss (such as figure 1 ) under the condition of directional arrangement, after the solvent is evaporated, the magnetic field is withdra...

Embodiment 2

[0053] Magnetic γ-Fe with a diameter of 600nm 2 o 3 @SiO 2 The core-shell structure submicron sphere is used as the support body, and the carboxylated single-walled carbon nanotubes are first assembled on the surface of the magnetic core-shell structure submicron sphere by electrostatic self-assembly method, and the assembly time is 5 hours; then, the surface is wrapped with carboxylated carbon nanotubes The magnetic submicron spheres of the tube were put into the graphene oxide dispersion liquid for stirring and assembly, and the assembly time was 8 hours; the three-dimensional magnetic carbon nanotube / reduced graphene oxide heterojunction gas-sensing material was dispersed in the isopropanol solution, and the During the production process of the gas sensor, the above-mentioned sensitive material solution with a concentration of 0.2 mg / mL is oriented under a transverse magnetic field with a strength of 200 gauss. After the solvent is evaporated, the magnetic field is withdra...

Embodiment 3

[0055] Magnetic Ni@SiO with a diameter of 800 nm 2 The core-shell structure submicron sphere is used as the support body, and a layer of carboxylated single-walled carbon nanotubes is first assembled on the surface of the magnetic core-shell structure submicron sphere by electrostatic self-assembly method, and the assembly time is 10 hours; then, the surface is wrapped with carboxyl groups The magnetic submicron spheres of single-walled carbon nanotubes were put into the graphene oxide dispersion liquid for stirring and assembly, and the assembly time was 6 hours; the three-dimensional magnetic carbon nanotubes / reduced graphene oxide heterojunction gas-sensing materials were dispersed in In the propanol solution, during the production process of the gas sensor, the above-mentioned sensitive material solution with a concentration of 0.2mg / mL is oriented under the condition of a transverse magnetic field with a strength of 3000 Gauss. ° heat treatment for 90 minutes to complete ...

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Abstract

The invention discloses a heterojunction sensitive device, its preparation method and a gas sensor containing the sensitive device, belonging to the technical field of semiconductor devices and sensing. The preparation method includes three steps: carbon nanotubes and graphene oxide are sequentially coated on the surface of magnetic submicron spheres to form a heterojunction; the above-mentioned three-dimensional magnetic carbon nanotubes / reduction The graphene oxide heterojunction forms a chain-like multi-conduction channel arranged in an orientation between the electrodes; the graphene oxide is reduced to complete the construction of the gas sensor device. Compared with the prior art, the present invention utilizes in-situ formation of carbon-based heterojunctions and magnetic field manipulation technology to effectively solve the problem of low sensitivity of sensitive nanomaterial devices, poor uniformity of sensitive materials, and poor performance stability of devices in the same batch during the construction of gas sensor sensors. and other issues, the construction method is simple, efficient, and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of semiconductor devices and sensing (G03F), and specifically relates to a method for preparing a three-dimensional magnetic carbon nanotube / reduced graphene oxide heterojunction in situ and using a magnetic field to induce a controllable arrangement to construct a high-performance gas sensor. Background technique [0002] Reduced graphene oxide exhibits specific properties different from conventional materials due to its huge specific surface area, unique size effect and macroscopic quantum tunneling effect. The huge specific surface area provides a lot of active sites, and through functional groups The modification method can easily realize different gas-sensing response characteristics, and at the same time has the characteristics of working at room temperature, which is a kind of nano-gas-sensing material with great development potential. However, in the construction of reduced graphene oxide sensor devi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12B82Y15/00C01B32/198C01B32/184
CPCB82Y15/00C01B32/184C01B32/198G01N27/127
Inventor 苏言杰叶显柱俞健
Owner 南京晶碳纳米科技有限公司
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