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Lanthanum-yttrium-codoped nano-titanium dioxide gas-sensitive material as well as preparation method and application thereof

A technology of nano-titanium dioxide and gas-sensing materials, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology for materials and surface science, etc., can solve the problems of rare gas-sensing materials or gas-sensing sensors, and achieve Improve gas sensing performance, improve stability, good stability effect

Inactive Publication Date: 2013-06-19
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are few reports on gas-sensitive materials or gas-sensitive sensors for the detection of o-chlorophenol

Method used

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  • Lanthanum-yttrium-codoped nano-titanium dioxide gas-sensitive material as well as preparation method and application thereof
  • Lanthanum-yttrium-codoped nano-titanium dioxide gas-sensitive material as well as preparation method and application thereof
  • Lanthanum-yttrium-codoped nano-titanium dioxide gas-sensitive material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Nano-titanium dioxide gas-sensing material co-doped with lanthanum and yttrium, with nano-titanium dioxide as the matrix and the amount of titanium dioxide as the base, the molar percentage of doped lanthanum is 0.2%; the molar percentage of yttrium is 0.2%; co-doped nano The average particle diameter of titanium dioxide is 56 nm.

[0039] The preparation steps are as follows:

[0040] (1) Dissolve 3.4mL tetrabutyl titanate in 16mL absolute ethanol, stir at room temperature for 30min to form solution A; add 2.0mL glacial acetic acid to 1mL deionized water to obtain solution B;

[0041] (2) Pour solution A into a constant pressure funnel, slowly drop into solution B, stir while dropping, and use 6mol·dm -3 Nitric acid was adjusted to pH=3 to obtain solution C;

[0042] (3) According to the molar ratio of Ti / La / Y=1:0.002:0.002, 0.0066g of lanthanum nitrate (La(NO 3 ) 3 ) and 0.0076g yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O) Dissolve in a mixed solution composed of 2mL d...

Embodiment 2

[0045] Embodiment 2, application of lanthanum, yttrium co-doped nano-titanium dioxide gas-sensing material

[0046] Take 5 mg of nano-titanium dioxide powder co-doped with lanthanum and yttrium prepared in Example 1, grind it finely, add a small amount of deionized water to make a paste, apply it evenly on the alumina ceramic tube, and place it in a muffle furnace at 300 °C Internally sintered for 2 hours to form a tube core, which is welded and packaged according to the conventional process of side-heated devices to obtain a gas sensor device. After 120 hours of electrical aging, the properties of the gas sensor were measured with a HW-30A gas sensor tester.

[0047] At an operating temperature of 210°C, the sensitivity of 100ppm o-chlorophenol was tested. From the response-recovery curve of the gas sensor to 100ppm o-chlorophenol, such as Figure 4 As shown, it can be seen that the response and recovery time of o-chlorophenol are 20s and 110s respectively.

[0048] Adding...

Embodiment 3

[0049] Embodiment 3, lanthanum, yttrium co-doped nano-titanium dioxide gas-sensing material, as described in Example 1, the difference is: the molar percentage of doped lanthanum is 0.4%; the molar percentage of yttrium is 0.8%; co-doped The average particle size of nano titanium dioxide is 68nm.

[0050] The preparation steps are as follows:

[0051] (1) Dissolve 3.4mL tetrabutyl titanate in 16mL absolute ethanol, stir at room temperature for 30min to form solution A;

[0052] (2) Add 2.0mL glacial acetic acid to 1mL deionized water to obtain solution B;

[0053] (3) Pour solution A into a constant pressure funnel, slowly drop into solution B, stir while dropping, and use 6mol·dm -3 nitric acid adjusted to pH ≈ 3 to obtain solution C;

[0054] (4) According to the molar ratio of Ti / La / Y=1:0.004:0.008, 0.0132g of lanthanum nitrate (La(NO 3 ) 3 ) and 0.0304g yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O) Dissolve it in a mixed solution composed of 2mL deionized water and 3mL abso...

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Abstract

The invention relates to a lanthanum-yttrium-codoped nano-titanium dioxide gas-sensitive material as well as a preparation method and an application thereof. The material is prepared by the steps of: by taking nano-titanium dioxide as a matrix and the amount of titanium substances as a base number, doping 0.1-0.8 mol% of lanthanum and 0.1-0.8 mol% of yttrium, dripping ethanol solution of tetrabutyl titanate into the ethanol solution of lanthanum nitrate and yttrium nitrate by utilizing a sol-gel method to prepare sol, and drying, grinding and roasting the sol. The grain diameter of the obtained lanthanum-yttrium-codoped nano-titanium dioxide is 35-70 nm. The invention further provides the preparation method of the material. The obtained gas-sensitive material is used for producing gas-sensitive sensors for detecting o-chlorophenol, is high in sensitivity, good in selectivity and short in response time and is beneficial for realizing fast detection of the o-chlorophenol.

Description

technical field [0001] The invention relates to a lanthanum-yttrium co-doped nano-titanium dioxide gas-sensing material and a preparation method and application thereof, belonging to the technical field of gas-sensing materials. Background technique [0002] Ortho-chlorophenol, namely 2-chlorophenol, is an important chemical raw material, which is widely used in organic synthesis and the manufacture of dyes. Because it is easy to volatilize and cause serious harm to animals, plants, water and soil, it is identified as a persistent organic pollutant. At present, gas chromatography and chromatography / mass spectrometry are mainly used for the detection of o-chlorophenol. Because these methods require large precision instruments and are inconvenient to carry, the application of real-time detection is limited. How to quickly and accurately detect o-chlorophenol has become one of the focuses of attention. [0003] The research on making nanomaterials into gas sensors to detect ...

Claims

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Application Information

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IPC IPC(8): C01G23/053B82Y30/00G01N27/407
Inventor 景志红李芬李倩
Owner QUFU NORMAL UNIV
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