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Preparation of Nano-SnO2 Loaded Polyα-Naphthylamine Nanotube Gas Sensing Materials

A technology of nano-tin dioxide and gas-sensitive sensing materials, applied in the field of material chemistry, can solve the problems of in-situ modification of polymer materials and harsh synthesis environment, etc., and achieve stable structure and morphology control, simple process, and cheap raw materials Effect

Inactive Publication Date: 2016-04-27
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently synthesized SnO 2 The methods of nanomaterials mainly include laser lift-off method, microwave method, plasma method, hydrothermal / solvothermal method, etc. The synthesis environment of these methods is relatively harsh, and they are not suitable for in-situ modification of polymer materials.

Method used

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  • Preparation of Nano-SnO2 Loaded Polyα-Naphthylamine Nanotube Gas Sensing Materials
  • Preparation of Nano-SnO2 Loaded Polyα-Naphthylamine Nanotube Gas Sensing Materials
  • Preparation of Nano-SnO2 Loaded Polyα-Naphthylamine Nanotube Gas Sensing Materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, nanometer SnO The chemical preparation method of loaded poly α-naphthylamine nanotube:

[0021] First, 2 mmol of α-naphthylamine monomer, 4 mmol of stannous chloride and 10 mmol of b-naphthalenesulfonic acid were added to 50 mL of deionized water and stirred to form an emulsion. Another 20mmol of potassium persulfate was dissolved in 50mL of deionized water and added to the previously prepared emulsion at a rate of two seconds per drop, the color of the mixture gradually turned blue and then turned brown. The mixed solution was continuously stirred at room temperature for 24 hours, and a black precipitate formed at the bottom of the cup. The resulting product was alternately washed with deionized water and ethanol several times to neutrality, and placed in an oven at 60°C for 8 hours to dry to obtain SnO 2 Supported poly-α-naphthylamine nanotubes. Product XRD patterns such as figure 1 shown, with SnO 2 The standard spectrum (JCPDS card: 41-1445) corres...

Embodiment 2

[0024] Repeat embodiment 1, adopt stannous sulfate to replace tin protochloride, obtain SnO 2 Supported poly-α-naphthylamine nanotubes. The sensitive element prepared from this material has a sensitivity of 1.2 in 10 ppm ammonia gas at room temperature.

Embodiment 3

[0026] Repeat embodiment 1, adopt 10% hydrogen peroxide to replace ammonium persulfate aqueous solution, obtain SnO 2 Supported poly-α-naphthylamine nanotubes. The sensitive element prepared from this material has a sensitivity of 1.4 in 10 ppm ammonia gas at room temperature.

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Abstract

The invention belongs to the technical field of material chemistry and relates to a chemical preparation method for a gas-sensitive sensing material of a nano-SnO2-loaded poly(alpha-naphthylamine) nanotube. The chemical preparation method comprises the following steps of adding an alpha-naphthylamine monomer, a water-soluble stannous salt and a template agent into deionized water, and stirring a mixture to obtain an emulsion; then weighing an initiating agent and dissolving the initiating agent into a beaker filled with deionized water, and adding the mixture into the prepared emulsion at the speed of two seconds per drop; after the reaction is completed, washing and drying a product to obtain a nano-SnO2-modified poly(alpha-naphthylamine) nanotube. The chemical preparation method is inexpensive in raw materials and simple in process, well-crystallized SnO2 can be uniformly modified and loaded on a poly(alpha-naphthylamine) nanotube at normal temperature, the structure and shape of the material are stably controlled, and the detection limit of ammonia gas is under 10 ppm at room temperature. In addition to the field of gas sensitive sensors, the obtained nano-SnO2-modified poly(alpha-naphthylamine) nanotube can be applied to the fields such as microwave absorption materials, super-capacitors, electrochromism, photocatalysts and the like.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and relates to a chemical preparation method of a nano-tin oxide-loaded polyα-naphthylamine nanotube gas-sensitive sensing material. Background technique [0002] Poly-α-naphthylamine is a conjugated polymer with fused ring structure, which has certain sensitivity to acidic and alkaline gases, and can directly obtain signal response at room temperature, but the disadvantage is low sensitivity. [0003] Tin dioxide is a kind of multifunctional wide bandgap semiconductor material, which has unique advantages in the field of gas sensor. Combining poly-α-naphthylamine with a large specific surface area with SnO 2 Composite preparation of gas sensor materials can combine the advantages of both, and obtain better gas response at lower operating temperatures. Currently synthesized SnO 2 The methods of nanomaterials mainly include laser lift-off method, microwave method, plasma method, hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/02C08L79/02C08K3/22
Inventor 汪元元葛美英张柯姜来新尹桂林何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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