A coaxial heterostructured sno 2 Preparation method and application of /zno nanocomposite fiber material

A nanocomposite fiber and heterogeneous structure technology, which is applied in fiber processing, textile and papermaking, and hollow filament manufacturing, can solve the problems of poor dispersion, complicated preparation methods, and high raw material costs, and overcome the limited application, Sensitive performance and simple preparation process

Inactive Publication Date: 2017-12-08
DALIAN NATIONALITIES UNIVERSITY
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Problems solved by technology

Although Chinese patent CN 101144789A discloses a gas sensor with high sensitivity, the sol-gel method obtains nanoscale powder SnO 2 / ZnO, due to the large specific surface area of ​​nano-scale powder, it is easy to agglomerate and has poor dispersion, which makes it difficult to meet the requirements of gas sensitivity
Gu Cuiping of Anhui Normal University used copper chloride, stannous chloride dihydrate, thiourea, and ethylene glycol as raw materials to produce copper tin sulfur, and obtained a porous flower-shaped tin dioxide material after calcination and pickling. Toluene, formaldehyde and other gases have high sensitivity, but the response sensitivity to 100ppm acetone is less than 6.5
The existing semiconductor gas-sensing material preparation methods are generally complicated, require harsh production conditions, and have high raw material costs, which are not suitable for large-scale production

Method used

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  • A coaxial heterostructured sno <sub>2</sub> Preparation method and application of /zno nanocomposite fiber material
  • A coaxial heterostructured sno <sub>2</sub> Preparation method and application of /zno nanocomposite fiber material
  • A coaxial heterostructured sno <sub>2</sub> Preparation method and application of /zno nanocomposite fiber material

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Experimental program
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Effect test

Embodiment 1

[0028] Two-step method to prepare SnO with coaxial heterostructure 2 / ZnO Nanocomposite

[0029] A coaxial heterostructure of SnO 2 The preparation method of / ZnO composite nanofiber material comprises the following processing steps:

[0030] ① Weigh 0.5g SnCl 2 2H 2 Dissolve O in 4ml of absolute ethanol, stir magnetically until completely dissolved, the solution is colorless and transparent, weigh 0.8g of PVP and 2ml of DMF, dissolve it in SnCl 2 In the ethanol solution, after magnetic stirring for 8 hours, a colorless, transparent and viscous spinning precursor solution was formed. The prepared SnO 2 The spinning precursor solution was injected into a 10ml glass needle tube connected with a No. 7 needle, and connected to the electrospinning device. The electrospinning device is mainly composed of three parts: a high-voltage power supply, a container with a nozzle and a receiving device. The container with the nozzle is composed of a 10ml glass needle tube connected wit...

Embodiment 2

[0033] ①Weigh 1.1g SnCl 2 2H 2 O was dissolved in 1.5ml of absolute ethanol, magnetically stirred until completely dissolved, the solution was colorless and transparent, weighed 1.5g of PVP and 1.2ml of DMF, dissolved in SnCl 2 In the ethanol solution, after magnetic stirring for 8 hours, a colorless, transparent and viscous spinning precursor solution was formed, and the electrospinning method was used to obtain the SnCl-containing 2 The white paper-like intermediate product is calcined with oxygen at a high temperature of 600°C to obtain SnO with a hollow multi-level structure 2 Nanofibers;

[0034] ②SnO 2 Make nanofibers into a paste, spin-coat on a glass slide with a thickness of 0.1-0.5 mm, dry in a drying oven at 250 °C for 1.5 hours, and drop 0.06 mol / L zinc acetate solution evenly on the SnO 2 Place the dried glass slide in a 0.06mol / L ethanol solution of zinc acetate, heat it in a constant temperature water bath at 90°C for 4 hours, and finally take out the glass ...

Embodiment 3

[0036] ①Weigh 0.8g SnCl 2 2H 2 Dissolve O in 8ml of absolute ethanol, stir magnetically until completely dissolved, the solution is colorless and transparent, weigh 1g of PVP and 4.8ml of DMF, and dissolve it in SnCl 2 In the ethanol solution, after magnetic stirring for 8 hours, a colorless, transparent and viscous spinning precursor solution was formed, and the electrospinning method was used to obtain the SnCl-containing 2 The white paper-like intermediate product is calcined with oxygen at a high temperature of 600°C to obtain SnO with a hollow multi-level structure 2 Nanofibers;

[0037] ②SnO 2 The nanofibers were made into a paste, spin-coated on a glass slide with a thickness of 0.5 mm, and dried in a drying oven at 200 ° C for 1 hour, and 0.02 mol / L zinc acetate solution was evenly dropped on the SnO 2 On the surface of the fiber, dry in a drying oven at 200°C for 30 minutes; put the dried glass slide in a 0.02mol / L ethanol solution of zinc acetate, heat it in a co...

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Abstract

The invention provides a preparation method and applications of a SnO2 / ZnO nano composite fiber material with a coaxial heterostructure, and belongs to the technical field of metal oxide semiconductor sensor material preparation. The preparation method comprises following steps: PVP is taken as an organic solvent; SnCl2.2H2O, ethyl alcohol, and DMF are mixed fully so as to obtain a Sn salt spinning precursor liquid, and electrostatic spinning and high temperature oxygen-containing calcining are adopted so as to obtain SnO2 nano fiber; the SnO2 nano fiber is prepared into a slurry, is dried, and is delivered into an ethanol solution of zinc acetate, and an obtained mixture is heated in thermostatic waterbath at 80 to 90 DEG C so as to obtain the hollow SnO2 / ZnO nano composite fiber material with a coaxial heterostructure. The SnO2 / ZnO nano composite fiber material with a coaxial heterostructure, novel morphology, and a stable structure is obtained at a reasonable ratio via two-step-method of electrostatic spinning and thermostatic waterbath. The preparation method is simple; the raw materials are cheap and easily available; the preparation method is suitable for large scale production; and at the same time, indirectly heated gas sensors prepared from the SnO2 / ZnO nano composite fiber material possesses more excellent and higher sensitivity on methanol.

Description

technical field [0001] The invention relates to a coaxial heterostructure SnO 2 The invention discloses a preparation method and application of ZnO nanometer composite fiber material, belonging to the technical field of metal oxide semiconductor sensor material preparation technology. Background technique [0002] Tin dioxide is one of the earliest semiconductor gas sensor materials studied. Because of its high electrical conductivity, stable crystal structure, low cost and wide applicability, it has always been a research and application hotspot in the field of semiconductor gas sensors. However, a single metal oxide semiconductor material often cannot meet the requirements of various application fields due to its performance defects. [0003] The sensitivity of semiconductor gas-sensing materials not only depends on the composition of the material, but also the structure and morphology of the material itself will have a great impact on the performance. Although Chinese ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/44D01F9/08D01F1/08D01D5/00
Inventor 杜海英谷秋实于乃森孙炎辉廖家发
Owner DALIAN NATIONALITIES UNIVERSITY
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