Preparation method for MOF-based Co-doped tin dioxide gas-sensitive nano material as well as product and application

A nanomaterial, tin dioxide technology, applied in tin oxide, analytical materials, measurement devices, etc., can solve the problems of p-n junction reduction, gas sensing performance limitation, etc., to achieve improved gas sensing response, controllable Co doping amount, Responsive recovery effect

Active Publication Date: 2019-01-18
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the general process of doping metal elements, metal elements are easy to aggregate into large particles, which greatly reduces the amount of p-n junctions built and limits the improvement of gas sensing performance.

Method used

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  • Preparation method for MOF-based Co-doped tin dioxide gas-sensitive nano material as well as product and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Measure 40mL of deionized water and 20mL of N,N-dimethylformamide (DMF) into a flask, and stir evenly;

[0023] (2) 1g tin protochloride hexahydrate (SnCl 2 ∙6H 2 O), 0.2g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ∙6H 2 (2) and 0.5mL terephthalic acid (PTA) are added in the flask, fully stirred at room temperature;

[0024] (3) Transfer the solution in the beaker to the reaction kettle, react at 160~200°C for 30min, filter the reacted precipitate, wash and dry;

[0025] (4) After drying, place it in a muffle furnace and bake at 500°C for 10h at a heating rate of 5°C / min to obtain Co-doped SnO 2 Gas-sensitive nanomaterials.

[0026] figure 1 Co-doped SnO for the present invention 2 Real-time response curve of gas-sensing nanomaterials to 10 ppm acetone gas, operating temperature. Among them, the sensitivity reaches 36.89, the response time is about 14s, and the recovery time is about 8s.

Embodiment 2

[0028] (1) Measure 30mL of deionized water and 20mL of N,N-dimethylformamide (DMF) into a flask and stir evenly;

[0029] (2) 0.8g tin protochloride hexahydrate (SnCl 2 ∙6H 2 O), 0.1g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ∙6H 2 (2) and 0.4mL terephthalic acid (PTA) were added in the flask, stirred at room temperature;

[0030] (3) Transfer the solution in the beaker to the reaction kettle, and react at 160~200°C for 25 minutes; filter the precipitate, wash and dry;

[0031] (4) After drying, place it in a muffle furnace and bake at 600°C for 15h at a heating rate of 5°C / min to obtain Co-doped SnO 2 Gas-sensitive nanomaterials.

Embodiment 3

[0033] (1) Measure 35mL of deionized water and 15mL of N,N-dimethylformamide (DMF) into a flask, and stir evenly;

[0034] (2) 0.9g tin protochloride hexahydrate (SnCl 2 ∙6H 2 O), 0.15g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ∙6H 2 (2) and 0.3mL terephthalic acid (PTA) were added in the flask, stirred at room temperature;

[0035] (3) Transfer the solution in the beaker to the reaction kettle, and react at 160~200°C for 40 minutes; filter the precipitate, wash and dry;

[0036] (4) After drying, put it in a muffle furnace and bake at 600°C for 8h, and the heating rate is 2°C / min to obtain Co-doped SnO 2 Gas-sensitive nanomaterials.

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Abstract

The invention discloses a preparation method for an MOF-based Co-doped tin dioxide gas-sensitive nano material as well as a product and application. MOF (a metal organic framework structure) of Co andSn is utilized, and the Co-doped SnO2 gas-sensitive nano material is prepared by regulating conditions such as concentration, proportion, reaction time and a reaction temperature of a precursor. Thepreparation method is characterized in that Co doping amount is controllable, and Co element is uniformly distributed. The Co-doped gas-sensitive nano material prepared by the preparation method is high in purity, is uniform in dimension, is greatly improved in gas-sensitive response in comparison with a pure SnO2 gas-sensitive material, and is quick in response recovery speed.

Description

technical field [0001] The invention belongs to the field of preparation of metal oxide nanomaterials, and in particular relates to a preparation method, product and application of a Co-doped tin dioxide gas-sensitive nanomaterial based on MOF. Background technique [0002] Tin dioxide (SnO 2 ) is a low-cost, non-toxic n-type inorganic semiconductor material with a wide bandgap (3.6 eV). SnO 2 Since its resistivity will vary with the type and concentration of the gas adsorbed on the surface, the composition and concentration of the gas can be detected by using this property, and it is very effective for various gases such as liquefied petroleum gas, coal gas, natural gas, carbon monoxide, hydrogen and ethanol vapor. High sensitivity. However, a single SnO 2 Gas sensors still have disadvantages such as high operating temperature and poor selectivity. Doped with other metal elements, can be combined with SnO 2 Build a p-n junction to form an electron depletion layer and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02G01N33/00
CPCC01G19/02G01N33/0036
Inventor 何丹农孙健武葛美英卢静尹桂林金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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