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WO3 nano-particle, as well as preparation method and application in sensor thereof

A nanoparticle and sensor technology, which is applied in the field of WO3 nanoparticles and its preparation, can solve the problems that restrict the gas-sensing performance of nanoparticles, and achieve the effects of fast response/recovery, high porosity, reversibility and good selectivity

Active Publication Date: 2018-12-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, a single WO 3 The preparation of nanoparticles mostly adopts the thermal evaporation method, and the WO prepared by this method 3 The agglomeration of nanoparticles is serious, which seriously restricts the WO 3 Gas Sensitive Properties of Nanoparticles

Method used

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  • WO3 nano-particle, as well as preparation method and application in sensor thereof
  • WO3 nano-particle, as well as preparation method and application in sensor thereof
  • WO3 nano-particle, as well as preparation method and application in sensor thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A gas-sensitive coating is WO 3 The gas sensor of nanoparticles, the schematic diagram of its structure is shown in figure 1 As shown, the heating wire 3 traverses from the ceramic tube 1 and is welded on the heating electrode of the base, the gold electrode 2 covers the outer surface of the ceramic tube 1 and is welded on the measuring electrode of the base through the platinum wire 4, the gas-sensitive coating Layer 5 is coated on gold electrode 2 and Al 2 o 3 Ceramic tube 1 surface.

[0040] The composition of the gas-sensitive coating 5 is WO with a single monoclinic crystal structure. 3 Nanoparticles, with a diameter in the range of 10-50nm, have large porosity and specific surface area. Its X-ray diffraction pattern is as figure 2 As shown, the present embodiment prepares WO with a single monoclinic crystal structure. 3 Nanoparticles, without any other impurity diffraction peaks, crystallized in good condition; WO 3 Scanning electron micrographs of nanopa...

Embodiment 2

[0052] A gas-sensitive coating is WO 3 The gas sensor of nanoparticles, the schematic diagram of its structure is shown in figure 1 shown.

[0053] A gas-sensitive coating is WO 3 Nanoparticle NO 2 The preparation method of the gas sensor is carried out according to the following steps:

[0054] ① Weigh 0.10g polyethyleneimine (PEI) and dissolve it in deionized water, stir it magnetically for 10min to ensure full dissolution, and get 6mL concentration of 0.03mol.L -1 Polyethyleneimine (PEI) solution; Weigh 1.48g Na 2 WO 4 2H 2 O was dissolved in deionized water, and magnetically stirred for 5 minutes to obtain a concentration of 0.30mol.L in 15mL-1 Na 2 WO 4 2H 2 O solution; the above two solutions were mixed, and magnetically stirred for 20 minutes to obtain a mixed solution; the concentration of 13mL was 3mol.L -1 The HCl solution was added into the mixed solution, and magnetically stirred for 10 min;

[0055] ② Transfer the mixed solution obtained in step ① to a...

Embodiment 3

[0060] A gas-sensitive coating is WO 3 The gas sensor of nanoparticles, the schematic diagram of its structure is shown in figure 1 shown.

[0061] A gas-sensitive coating is WO 3 Nanoparticle NO 2 The preparation method of the gas sensor is carried out according to the following steps:

[0062] ①Weigh 0.66g Na 2 WO 4 2H 2 Dissolve O in deionized water, stir magnetically for 10 minutes to ensure full dissolution, and obtain a concentration of 0.10mol.L in 20mL -1 Na 2 WO 4 2H 2 O solution; weigh 0.96g polyethyleneimine (PEI) and dissolve it in deionized water, and stir it magnetically for 10min to obtain 16mL with a concentration of 0.10mol.L -1 polyethyleneimine solution; the above two solutions were mixed, and magnetically stirred for 20min to obtain a mixed solution; the concentration of 9mL was 3mol.L -1 The HCl solution was added to the mixed solution, and magnetically stirred for 10 min;

[0063] ② Transfer the mixed solution obtained in step ① to a 100mL po...

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Abstract

The invention belongs to the technical field of gas sensors of semiconductor oxides, and particularly relates to a WO3 nano-particle, as well as a preparation method and an application in a sensor thereof. The preparation method comprises the following steps: mixing a polyethyleneimine solution and a Na2WO4.2H2O2 solution, regulating the pH value to be 0.8-1.4 with an HCL solution, reacting for 4-36 hours at a constant temperature of 140-180 DEG C, washing, drying and heating for 4-8 hours to obtain the WO3 nano-particle which has a monoclinic crystal structure and a diameter of 10-50nm; and coating the surfaces of an Al2O3 ceramic tube and a gold electrode, and ageing to prepare the gas sensor. As for the NO2 gas sensor prepared based on the method, quick response for high-sensitivity, high selectivity and low working temperature of NO2 gas from sub-ppm to ppb level can be realized.

Description

technical field [0001] The invention relates to the technical field of semiconductor oxide gas sensors, in particular to a WO 3 Nanoparticles and methods for their preparation and their use in sensors. Background technique [0002] With the rapid development of my country's economic construction and the continuous acceleration of the industrialization process, more and more toxic and harmful gases are produced in the production and utilization of mineral resources, transportation energy, petrochemicals, etc., resulting in increasing environmental pollution and a serious threat human health and safety. NO 2 The gas is a highly toxic gas with a pungent smell. It mainly comes from mining blasting, industrial combustion waste gas and automobile exhaust. It is the main cause of air pollution, acid rain, photochemical smog and greenhouse effect. Therefore, in order to better monitor and detect the pollution of such gases to the environment, it is urgent to develop a highly sensi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02B82Y40/00G01N27/30
CPCB82Y40/00C01G41/02C01P2002/72C01P2004/03C01P2004/04C01P2004/64G01N27/30
Inventor 沈岩柏李停停赵思凯李国栋韩聪魏德洲
Owner NORTHEASTERN UNIV
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