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Dual-rare earth-co-doped titanium dioxide gas sensitive sensing material preparation

A gas-sensing sensing material, titanium dioxide technology, applied in the fields of material analysis, material analysis by electromagnetic means, nanostructure manufacturing, etc., can solve the problems of inconspicuous photocatalytic activity, low proportion of rare earth atoms, and low doping utilization rate of rare earth elements. Advanced problems, to achieve the effect of simple process and process, wide adjustable range of parameters, and strong repeatability

Inactive Publication Date: 2016-03-16
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some previous preparation methods, the doping utilization rate of rare earth elements is not high, and the proportion of rare earth atoms that can successfully replace the lattice sites in titanium dioxide is low, so the photocatalytic activity is not significantly improved.
And, the preparation method of co-doping titanium dioxide with two kinds of rare earth elements is rarely reported at present; there is no report about the preparation method of co-doping titanium dioxide with more than three rare earth elements

Method used

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  • Dual-rare earth-co-doped titanium dioxide gas sensitive sensing material preparation

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Experimental program
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Effect test

Embodiment 1

[0021] 1 g of urea, 0.1 g of lanthanum nitrate hexahydrate, and 0.3 g of cerium nitrate hexahydrate were sequentially added to 80 ml of absolute ethanol. After stirring to dissolve, add 12 ml of isopropyl titanate and stir evenly. Then, 7 ml of deionized water was added dropwise to the above system while stirring until a transparent gel was formed. The above gel was put into a Teflon-lined stainless steel autoclave for hydrothermal reaction at 170 °C for 48 hours. After the reaction, the precipitated product is washed with deionized water until the pH of the washing liquid is neutral, and then dried to obtain the target rare earth element doped titanium dioxide nanometer material.

[0022] The obtained powder is dispersedly coated on the hexapod ceramic tube gas sensor test element, and the WS-30A gas sensor test system is used to test the response to NH3 gas at different concentrations. It has obvious response in 10ppm ammonia gas atmosphere at room temperature, and the sen...

Embodiment 2

[0024] Add 0.5 g of urea, 0.3 g of lanthanum nitrate hexahydrate, and 0.02 g of cerium nitrate hexahydrate in sequence in 50 ml of absolute ethanol. After stirring to dissolve, add 8 ml of n-tetrabutyl titanate and stir evenly. Then, 4 ml of deionized water was added dropwise to the above system while stirring until a transparent gel was formed. The above gel was put into a Teflon-lined stainless steel autoclave for hydrothermal reaction at 150 °C for 24 h. After the reaction, the precipitated product is washed with deionized water until the pH of the washing liquid is neutral, and then dried to obtain the target rare earth element-doped titanium dioxide nanomaterial.

[0025] The obtained rare-earth-doped titanium dioxide nanometer material is a highly dispersed nanocrystal grain with a particle diameter of about 5-7 nanometers and uniform size. image 3 It shows that the obtained powder is dispersedly coated on the gas sensor test element of the hexapod ceramic tube, and t...

Embodiment 3

[0027] Add 1.2 g of urea, 0.1 g of gadolinium nitrate hexahydrate, and 0.05 g of neodymium nitrate hexahydrate in sequence in 100 ml of absolute ethanol. After stirring to dissolve, add 15 ml of tetraethyl titanate and stir well. Then, 8 ml of deionized water was added dropwise to the above system while stirring until a transparent gel was formed. The above gel was put into a Teflon-lined stainless steel autoclave for hydrothermal reaction at 200 °C for 16 h. After the reaction, the precipitated product is washed with deionized water until the pH of the washing liquid is neutral, and then dried to obtain the target rare earth element-doped titanium dioxide nanomaterial.

[0028] The obtained powder is dispersedly coated on the hexapod ceramic tube gas sensor test element, and the WS-30A gas sensor test system is used to test the response to NH3 gas at different concentrations. There is an obvious response in 10ppm ammonia gas atmosphere at room temperature, and the sensitivi...

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Abstract

The invention relates to a dual-rare earth-co-doped titanium dioxide gas sensitive sensing material preparation. The method includes the following steps of: adding urea and nitrate of rare earth elements into absolute ethyl alcohol and dissolving the urea and the nitrate of the rare earth elements to obtain solution; adding liquid phase titanium sources into the solution to form a homogeneous solution; stirring and adding deionized water into the homogeneous solution to form transparent gel; and performing hydro-thermal treatment on the transparent gel, and then performing washing, filtering and drying to obtain a dual-rare earth-co-doped titanium dioxide gas sensitive sensing nano-material. Through automatic regulation of pH to a reaction system by means of slow decomposition of the urea in a hydrothermal process, the rare earth elements can be doped into titanium dioxide; the raw materials are cheap, the dual-rare earth-co-doped titanium dioxide gas sensitive sensing nano-material with excellent crystallization can be prepared at the normal temperature, and the material is lower than 10 ppm in detection limit of ammonia gas. The dual-rare earth-co-doped titanium dioxide gas sensitive sensing material can be applied to the field of gas sensitive sensors, and also can be applied to the fields of microwave absorption materials, supercapacitors, electrochromism, and photocatalysts.

Description

technical field [0001] The invention relates to a preparation method of a rare earth element-doped titanium dioxide nanometer sensing material, belonging to the technical field of inorganic nanomaterial preparation. Background technique [0002] Due to its stable photochemical properties, high catalytic efficiency, strong oxidation ability, non-toxic and harmless, low price, simple process flow in practical applications, easy control of operating conditions, and no secondary pollution, titanium dioxide has been widely used as a photocatalyst. growing attention. Developed countries such as Europe and the United States have invested funds and research efforts in the research and development of titanium dioxide photocatalytic technology, and high-tech industries based on this are also taking shape. [0003] Titanium dioxide is a semiconductor functional material, but its working temperature is high, its gas sensitivity is low, but its stability is good Responsive and recovery...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00B82Y40/00G01N27/00
CPCB82B3/0004B82Y40/00G01N27/00
Inventor 何丹农林琳章龙王艳丽张春明
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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