Vanadium and palladium-codoped nanometer titania gas-sensitive material as well as preparation method and applications thereof

A technology of nano-titanium dioxide and gas-sensing materials, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, and nanotechnology for materials and surface science. -Short recovery time, reduced generation of by-products

Inactive Publication Date: 2013-05-15
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are relatively few gas-sensitive materials used for chlorobenzene detection

Method used

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  • Vanadium and palladium-codoped nanometer titania gas-sensitive material as well as preparation method and applications thereof
  • Vanadium and palladium-codoped nanometer titania gas-sensitive material as well as preparation method and applications thereof
  • Vanadium and palladium-codoped nanometer titania gas-sensitive material as well as preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Vanadium and palladium co-doped nano-titanium dioxide gas-sensing materials, with nano-titanium dioxide as the matrix, based on the amount of titanium dioxide, the molar percentage of doped vanadium is 1.5%; the molar percentage of palladium is 3%; the co-doped nano The average particle diameter of titanium dioxide is 8 nm.

[0041] The preparation steps are as follows:

[0042] (1) Weigh 7.5mgPd(NO 3 ) 2 .2H 2 O was dissolved in 15 mL of double distilled water to obtain solution A.

[0043] (2) Dissolve 3.4 mg of vanadyl triisopropoxide in 10 mL of ethanol to obtain solution B.

[0044] (3) Measure 0.3196mL of tetrabutyl titanate and add it dropwise to 5mL of ethylene glycol, stir at room temperature for 30min, and use 6mol·dm -3 Adjust the pH to 3 with nitric acid to obtain solution C.

[0045] (4) After mixing the solution A prepared in step (1) and the solution B prepared in step (2) and stirring evenly, add the mixed solution dropwise to the solution C prepar...

Embodiment 2

[0049] Embodiment 2, application of vanadium, palladium co-doped nano-titanium dioxide gas-sensing material

[0050] Take 5 mg of the vanadium and palladium co-doped nano-titanium dioxide powder 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.

[0051] At an operating temperature of 175°C, the sensitivity to 100 ppm of chlorobenzene was tested. From the response-recovery curve of the gas sensor to 100ppm chlorobenzene, such as Figure 4 shown. It can be seen that the response and recovery time of chlorobenzene are 12s and 28s respectively.

Embodiment 3

[0052] Embodiment 3, vanadium, palladium co-doped nano-titanium dioxide gas-sensitive material, as described in Example 1, the difference is: the molar percentage of doped vanadium is 0.5%; the molar percentage of palladium is 1%; co-doped The average particle size of nano titanium dioxide is about 12nm.

[0053] The preparation steps are as follows:

[0054] (1) Weigh 2.5mgPd(NO 3 ) 2 .2H 2 O was dissolved in 15 mL of double distilled water to obtain solution A.

[0055] (2) Dissolve 1.1 mg of vanadyl triisopropoxide in 10 mL of ethanol to obtain solution B.

[0056] (3) Measure 0.3196mL of tetrabutyl titanate and add it dropwise to 5mL of ethylene glycol, stir at room temperature for 30min, and use 6mol·dm -3 Adjust the pH to 3 with nitric acid to obtain solution C.

[0057] (4) After mixing the solution A prepared in step (1) and the solution B prepared in step (2) and stirring evenly, add the mixed solution dropwise to the solution C prepared in step (3) with a const...

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Abstract

The invention relates to a vanadium and palladium-codoped nanometer titania gas-sensitive material as well as a preparation method and applications thereof. The preparation method of the codoped nanometer titania gas-sensitive material comprises the steps of: taking nanometer titania as a matrix, and doping 0.5-1.5mol% of vanadium and 1.0-3.5mol% of palladium, mixing a Pd(NO3)2 solution with a vanadium triisopropoxy oxide alcohol solution and dropwise adding the mixture into a tetrabutyl titanate ethylene glycol solution to obtain gel, drying, grinding and calcining to obtain the vanadium and palladium-codoped nanometer titania gas-sensitive material, wherein the particle size of the vanadium and palladium-codoped nanometer titania ranges from 8 to 15nm. The invention further provides a preparation method of the material. The gas-sensitive material is used for a gas-sensitive sensor for detecting chlorobenzene, is high in sensitivity, good in selectivity, short in response-restoration time, and beneficial to realizing the fast detection of the chlorobenzene.

Description

technical field [0001] The invention relates to a vanadium-palladium 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] With the society's emphasis on environmental protection requirements, the research and development of detection methods and devices and equipment for harmful gases in the environment have become the focus of research and development. At present, the public attaches great importance to the detection of formaldehyde content in the living room. The detection of formaldehyde content generally uses semiconductor gas sensors, and the patent documents in this regard have been published. For example, CN101419181A provides a gas-sensitive material for detecting formaldehyde and a gas-sensitive component made of the material. The gas-sensitive material component is ZnO-TiO 2 Nanocomposite powder as matrix, doped with ZnO and TiO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08B82Y30/00G01N33/00
Inventor 景志红郭道军齐伟凌宝萍朱霄
Owner QUFU NORMAL UNIV
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