Three-dimensional hollow hybrid structure of polyaniline/graphene capsule and its preparation method and application

A graphene and polyaniline technology, applied in the field of gas sensors, can solve the problems of high working temperature, hinder commercial application, unstable chemical properties of metal oxides, etc., achieve large surface area, facilitate rapid response and recovery, and have Good for quick response

Active Publication Date: 2021-08-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, metal oxides are chemically unstable and require high operating temperatures, which greatly hinders their commercial application.

Method used

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  • Three-dimensional hollow hybrid structure of polyaniline/graphene capsule and its preparation method and application
  • Three-dimensional hollow hybrid structure of polyaniline/graphene capsule and its preparation method and application
  • Three-dimensional hollow hybrid structure of polyaniline/graphene capsule and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of preparation method of polyaniline / graphene capsule (PANI / GCs) three-dimensional hollow hybrid structure, comprises the following steps:

[0037]Step 1, using chemical vapor deposition (CVD), using nano-zinc oxide particles as a template, and acetylene as a carbon source to prepare graphene capsules;

[0038] 1.1. Put 20g of nano-ZnO particles into a quartz tube, place the quartz tube in a rotary CVD furnace with a rotation speed of 5 rpm, and heat it to 650 °C at a rate of 10 °C / min in an argon atmosphere. , with the gas flow rate of 30mL / min, acetylene gas was introduced as the reaction gas, and the reaction time was 30min. After the reaction was completed, it was naturally cooled to room temperature under an argon atmosphere, and the product was taken out to grow coated graphene on the surface of nano-ZnO particles. Nanolayers, resulting in graphene / zinc oxide composites;

[0039] 1.2. Soak the product obtained in step 1 in nitric acid (in nitric acid solut...

Embodiment 2

[0045] Compared with embodiment 1, this embodiment differs in that:

[0046] The specific process of step 2 is: take 3 mg of the graphene capsule GCs prepared in step 1 and disperse them in 100 mL of deionized water, and ultrasonically disperse them evenly, and place the obtained dispersion in an ice bath at 0°C.

Embodiment 3

[0048] Compared with embodiment 1, this embodiment differs in that:

[0049] The specific process of step 2 is: take 9 mg of the graphene capsule GCs prepared in step 1 and disperse them in 100 mL of deionized water, and ultrasonically disperse them evenly, and place the obtained dispersion in an ice bath at 0°C.

[0050] The mixed solution after the complete reaction of Example 1, Example 2 and Example 3 was washed alternately with deionized water and ethanol six times respectively. During the washing process, the centrifugal speed of the centrifuge was set to 3800r / min, so that the suspension After centrifugal separation, the obtained samples were dried at 80° C., and were respectively recorded as PANI / GCs-1 (Example 1), PANI / GCs-3 (Example 2) and PANI / GCs-9 (Example 3).

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Abstract

The polyaniline / graphene capsule three-dimensional hollow hybrid structure, preparation method and application belong to the technical field of resistive gas sensor. In the polyaniline / graphene capsule three-dimensional hollow hybrid structure, the graphene capsule has a hollow opening structure, and the polyaniline nanoparticles are in-situ polymerized on the inner and outer surfaces of the graphene capsule, and form a π-π with the graphene capsule bond conjugation, wherein the polyaniline nanoparticles have a particle size of 18-40nm. The graphene capsule of the present invention is a hollow open capsule structure, and its curved part has more heterocyclic structures such as five-membered rings and seven-membered rings, which can form π-π bond conjugation with polyaniline, which makes polyaniline not a simple Attached to the inner and outer surfaces of graphene capsules, it forms a strong chemical bond and realizes the selective surface growth of polyaniline, so that the three-dimensional hollow hybrid structure is more stable and the carrier transport is more convenient, which is beneficial to the Fast response and increased sensitivity to gases.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a polyaniline / graphene capsule three-dimensional hollow hybrid structure, a preparation method thereof, and an application in gas sensors. Background technique [0002] The development of low-cost, high-reliability and fast-response gas-sensitive materials and gas-sensitive sensors has become a research hotspot. It is widely used in the monitoring of health, industry, military and environmental fields, and provides protection for human safety in production and life. At present, gas sensor materials mainly include metal oxides, conductive polymers and carbon-based materials. Among them, metal oxides are chemically unstable and require high operating temperatures, which greatly hinders their commercial application. Conductive polymers and carbon-based materials have received extensive attention from researchers because of their low cost, high reliability, unique nanostructures...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/14C08G73/02C08K3/04C08K3/22G01N27/12
CPCB01J13/14C08G73/0266C08K3/22C08K2003/2296C08K2201/001C08K2201/011C08K3/042G01N27/126G01N27/127
Inventor 简贤王红聂松李涵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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