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 fields of titanium dioxide, titanium oxide/hydroxide, nanotechnology for materials and surface science, etc. -Short recovery time and improved gas sensitivity

Inactive Publication Date: 2014-05-21
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 material, using nano-titanium dioxide as the matrix and the amount of titanium dioxide as the base, the mole percentage of doped vanadium is 1.5%; the mole percentage of palladium is 3%; the co-doped nano The average particle size of titanium dioxide is 8 nm.

[0041] The preparation steps are as follows:

[0042] (1) Weigh 7.5mg Pd(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 dropwise to 5mL of ethylene glycol, stir for 30min at room temperature, and use 6mol·dm -3 Adjust the pH of the nitric acid to 3 to obtain solution C.

[0045] (4) After mixing and stirring the solution A prepared in step (1) and the solution B prepared in step (2) uniformly, use a constant pressure funnel to drop the mixture into the solution...

Embodiment 2

[0049] Example 2. Application of nano-titanium dioxide gas-sensitive material co-doped with vanadium and palladium

[0050] Take 5 mg of the vanadium and palladium co-doped nano titanium dioxide powder prepared in Example 1, after grinding, add a small amount of deionized water to make a paste, evenly coat it 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, and welded and packaged in accordance with the conventional process of indirectly heated devices to obtain a gas sensor. After 120 hours of electrical aging, use the HW-30A gas sensor to measure the properties of the gas sensor.

[0051] Test the sensitivity of 100ppm chlorobenzene at a working temperature of 175°C. From the response of the gas sensor to 100ppm chlorobenzene-recovery curve, 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 and palladium co-doped nano titanium dioxide gas sensing material, as described in embodiment 1, the difference is: the mole percentage of doped vanadium is 0.5%; the mole percentage of palladium is 1%; co-doped The average particle size of nanometer titanium dioxide is about 12nm.

[0053] The preparation steps are as follows:

[0054] (1) Weigh 2.5mg Pd(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 dropwise to 5mL of ethylene glycol, stir for 30min at room temperature, and use 6mol·dm -3 Adjust the pH of the nitric acid to 3 to obtain solution C.

[0057] (4) After mixing and stirring the solution A prepared in step (1) and the solution B prepared in step (2) uniformly, use a constant pressure funnel to drop the mixture into the solution C prepared in step ...

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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 and palladium co-doped nano titanium dioxide gas sensitive material and a preparation method and application thereof, belonging to the technical field of gas sensitive materials. Background technique [0002] As the society attaches importance to environmental protection requirements, the research and development of detection methods, devices and equipment for harmful gases in the environment has begun to become the focus of research and development. At present, the public attaches great importance to the detection of formaldehyde content in the room. The detection of formaldehyde content generally uses semiconductor gas sensors. 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 is composed of ZnO-TiO 2 Nano composite powder as the matrix, mixed with ZnO a...

Claims

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Application Information

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Patent Type & Authority Patents(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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