The sno2/zno nanocomposite fiber material of the same type (n-n) heterogeneous structure and its preparation method and application

A nanocomposite fiber and heterogeneous structure technology, applied in the analysis of materials, fiber processing, material resistance, etc., can solve the problems of large specific surface area of ​​nanoscale powder, response sensitivity less than 6.5, and difficult to meet the requirements of gas sensitivity, to achieve Inexpensive raw materials, good response characteristics and recovery characteristics, novel shape effects

Inactive Publication Date: 2019-01-18
DALIAN NATIONALITIES UNIVERSITY
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Problems solved by technology

Although Chinese patent CN101144789A 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

Method used

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  • The sno2/zno nanocomposite fiber material of the same type (n-n) heterogeneous structure and its preparation method and application
  • The sno2/zno nanocomposite fiber material of the same type (n-n) heterogeneous structure and its preparation method and application
  • The sno2/zno nanocomposite fiber material of the same type (n-n) heterogeneous structure and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0035] Two-step method to prepare SnO with homotype (n-n) heterostructure 2 / ZnO Nanocomposite

[0036] (1) Preparation of spinning precursor solution

[0037] Weigh 0.6g SnCl 2 2H 2 Dissolve O in 4ml ethanol, stir magnetically until completely dissolved, the solution is colorless and transparent, weigh 0.5g PVP and 3ml DMF, dissolve it in SnCl 2 After magnetically stirring for 8 hours, a colorless, transparent and viscous spinning precursor solution was formed.

[0038] (2) Preparation of SnO by electrospinning 2 Nanofibers

[0039] 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. During the spinning process, the spinning precursor solution in the glass needle tube is under the action of a high-voltage electrostatic field, and the positively charged solution at the nozzle forms a "Taylor cone" at the spinneret, and forms a fine jet stream, which move...

Embodiment 2

[0044] (1) Weigh 0.5g SnCl 2 2H 2 Dissolve O in 4ml ethanol, stir magnetically until completely dissolved, the solution is colorless and transparent, weigh 0.8g PVP and 2ml 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, and the electrospinning method was used to obtain the SnCl-containing 2 The white paper-like product is calcined with oxygen at 600°C to obtain SnO with a hollow multi-level structure 2 Nanofibers;

[0045] (2) SnO 2 The nanofibers were made into a paste, spin-coated on a glass slide with a thickness of 0.5 mm, dried in a drying oven at 250 ° C for 40 min, and 0.06 mol / L zinc acetate solution was evenly dropped on the SnO 2 On the surface of the fiber, place it in a drying oven at 250°C for 40 minutes; put the dried glass slide in 50ml of 58mmol.L -1 Zinc nitrate (Zn(NO 3 ) 2 ﹒ 6H 2 O) and 58mmol.L -1 Hexamethylenetetramine (C 6 h 1...

Embodiment 3

[0047] (1) Weigh 1.1g SnCl 2 2H 2 Dissolve O in 2.2ml ethanol, stir magnetically until completely dissolved, the solution is colorless and transparent, weigh 1.5g PVP and 2ml 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, and the electrospinning method was used to obtain the SnCl-containing 2 The white paper-like product is calcined with oxygen at 600°C to obtain SnO with a hollow multi-level structure 2 Nanofibers;

[0048] (2) SnO 2 The nanofibers were made into a paste, spin-coated on a glass slide with a thickness of 0.1mm, and dried in a drying oven at 200°C for 30 minutes, and 0.02mol / L zinc acetate solution was evenly dropped on the SnO 2 On the surface of the fiber, dry in a drying oven at 250°C for 40 minutes; put the dried glass slide in 50ml of 55mmol.L -1 Zinc nitrate and 55mmol.L -1 In the mixed aqueous solution of hexapetramine, grow in a c...

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Abstract

The invention relates to a same type (n-n) heterogeneous structure SnO2 / ZnO nano-composite fiber material and a preparation method and application thereof. The nano-composite fiber material of a novel structure is designed, raw materials are reasonably matched, an electrostatic spinning method and a low-temperature water bathing method are utilized for evenly growing ZnO nano-bars on SnO2 nano-fiber of a hollow multilevel structure, and the same type (n-n) heterogeneous structure SnO2 / ZnO nano-composite fiber material of a hollow structure is obtained; strong points of SnO2 and ZnO are brought into play, deficiencies of SnO2 and ZnO are made up, SnO2 and ZnO play a synergistic effect, and the defect that application of single metallic oxide is limited in the field of gas sensors is overcome. The gas sensitivity of the composite material is remarkably improved through SnO2 of a rutile structure and ZnO of a hexagonal system wurtzite structure, and especially response of the composite material to acetone and ammonia gas is better. The preparation process for the nano-composite fiber material is simple, raw materials are low in price and easy to get, and the composite material is suitable for mass production.

Description

technical field [0001] The present invention relates to a kind of SnO with homotype (n-n) heterostructure 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] The gas sensors currently on the market mainly have shortcomings such as low sensitivity, long response recovery time, and poor selectivity, which can no longer meet the needs of this field. 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 performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/44D01F9/08G01N27/04
CPCD01F9/08D06M11/44G01N27/041
Inventor 杜海英孙炎辉于乃森谷秋实
Owner DALIAN NATIONALITIES UNIVERSITY
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