A kind of lanthanum manganate/semiconductor metal oxide composite gas sensitive material and preparation method thereof

A gas-sensitive material and semiconductor technology, applied in the direction of material resistance, etc., can solve the problems of gas-sensitive materials that have not yet appeared, and achieve the effect of being conducive to large-scale industrial use, good gas-sensing performance, and low cost

Active Publication Date: 2017-07-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a perovskite material, lanthanum manganate has good catalytic properties, but it has not been applied to the field of gas-sensing materials in the prior art.

Method used

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  • A kind of lanthanum manganate/semiconductor metal oxide composite gas sensitive material and preparation method thereof
  • A kind of lanthanum manganate/semiconductor metal oxide composite gas sensitive material and preparation method thereof
  • A kind of lanthanum manganate/semiconductor metal oxide composite gas sensitive material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh an appropriate amount of La(NO 3 ) 3 ·6H 2 O and Mn(NO 3 ) 2 4H 2 O, dissolved in distilled water, and press citric acid: metal ion (La 3+ and Mn 2+ )=0.25 Weighed a certain amount of citric acid and added it to the above solution, and stirred at room temperature for 24 hours to obtain the LMO precursor solution.

[0026] Nano SnO to be purchased 2 Add ethanol to the particle powder and ultrasonically vibrate for 15 minutes, dry it, and calculate the volume of LMO precursor solution that needs to be added in advance, so that LMO occupies the nanometer SnO 2 0.5wt% of the particle powder mass; to nano SnO 2 Add quantitative LMO precursor solution and appropriate amount of water to the particle powder, and grind to obtain LMO / SnO 2 slurry.

[0027] figure 1 for LMO / SnO 2 The XRD pattern of the composite gas-sensing material powder obtained after the slurry was calcined at 700°C / 2h, SnO can be seen in the figure 2 The powder is in the rutile phase, while...

Embodiment 2

[0031] The steps are as in Example 1, the mass percentage of LMO is increased from 0.5wt% to 2%, and the prepared LMO / SnO 2 The sensitivity of the sensor to 100ppm hydrogen reaches the highest at 340°C, which is 10.1; while pure SnO 2 The sensitivity of the sensor to 100ppm hydrogen at 340°C is 5.5, an improvement of 83%.

Embodiment 3

[0033] Weigh an appropriate amount of La(NO 3 ) 3 ·6H 2 O and Mn(NO 3 ) 2 4H 2 O, dissolved in distilled water, and press citric acid: metal ion (La 3+ and Mn 2+ )=0.25 A certain amount of citric acid was weighed and added to the above solution, and stirred at room temperature for 24 hours to obtain the LMO precursor solution.

[0034] Weigh 1.1962g C 4 h 6 o 4 Zn·2H 2O, dissolved in 85mL distilled water, stirred for 10min to make the solution completely clear; slowly pour 35mL 2M NaOH solution into the above solution, the mixed solution will appear cloudy first and then clear; pour the above mixed solution into 100mL polytetrafluoroethylene In an ethylene reactor, the filling amount is 80%, and it is kept in an oven at 200° C. for 20 hours; the white powder obtained after the heat preservation is washed three times with water and alcohol, and centrifuged to obtain a white ZnO powder. The ZnO powder has a nanoflower structure, image 3 It is the SEM picture of the ...

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Abstract

The invention discloses a lanthanum manganate / semiconductor metal oxide composite gas-sensing material and a preparation method thereof, which is characterized in that the composite gas-sensing material is composed of semiconductor metal oxide and lanthanum manganate. Compared with pure semiconducting metal oxides, the gas sensing performance of LMO / semiconducting metal oxide composite gas sensing materials has been improved by more than 70%.

Description

technical field [0001] The invention belongs to the field of gas sensors, and in particular relates to a method for preparing a gas-sensing material in which lanthanum manganate and semiconductor metal oxide are compounded. Background technique [0002] In the life of modern society, people are exposed to various gases every day, such as automobile exhaust, household gas, industrial waste gas and so on. Most of these gases are not good for people's health, and are also very harmful to the environment, so how to detect the emission and leakage of these gases is of great significance to people's safety. [0003] As a detection element that converts the external atmosphere information into a specific and identifiable signal, the gas sensor has received extensive attention in gas detection. Among many gas sensor materials, semiconducting metal oxide materials have attracted widespread attention due to their advantages such as low cost, wide range of sources, simple preparation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04
Inventor 易建新纪磊张赫陈冬冬刘卫姜羲
Owner UNIV OF SCI & TECH OF CHINA
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