Ammoniacal nanometer composite oxides sensitive material

A sensitive material, nanotechnology, applied in the field of sensing, can solve the problems of complex operation, inability to realize on-site, insufficient stability and sensitivity, etc., and achieve the effects of good selectivity, slow precipitation process, and uniform particle growth.

Inactive Publication Date: 2008-05-21
BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have relatively high sensitivity, but the operation is complicated and must be completed in the laboratory, which cannot be realized on site.
The on-site determination methods of ammonia mainly include detection tube colorimetry, which has insufficient stability and sensitivity, and cannot complete the accurate determination of trace amounts of ammonia.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Weigh 200 g of ammonium tungstate and ammonium dichromate according to the atomic ratio of W and Cr of 100:45, dissolve them in 150 mL of deionized water, heat and stir at 60 ° C until completely dissolved, and prepare Solution (I). Butyl titanate and concentrated hydrochloric acid were dissolved in isopropanol to prepare a solution (II), wherein the concentrations of butyl titanate and hydrochloric acid were 0.75 and 0.3 mol / L, respectively. Keep stirring at 60°C, add solution (II) dropwise to solution (I) so that the atomic ratio of W and Ti is 100:30, cool to room temperature and continue stirring for 1 hour, let stand for 10 hours, and reduce the precipitate. Filter under pressure, bake at 110°C for 2 hours until dry, grind thoroughly, then slowly heat up to 450°C in a high-temperature box-type resistance furnace for calcination for 4 hours to obtain nano-powder material with a particle size of 25-35nm.

Embodiment 2

[0015] Example 2: Weigh 200 g of ammonium tungstate and chromium acetate according to the atomic ratio of W and Cr of 100:50, and dissolve them in 200 mL of 1:1 ethanol aqueous solution, heat and stir at 65 ° C until completely dissolved, Solution (I) is prepared. Butyl titanate and concentrated hydrochloric acid were dissolved in ethanol to prepare a solution (II), wherein the concentrations of butyl titanate and hydrochloric acid were 0.65 and 0.25 mol / L, respectively. Keep stirring at 65°C, add solution (II) dropwise to solution (I) so that the atomic ratio of W and Ti is 100:27, cool to room temperature and continue stirring for 1 hour, then let stand for 10 hours, and the precipitate Filtrate under reduced pressure, and dry at 110°C for 2 hours. After fully grinding, slowly raise the temperature to 400°C in a high-temperature box-type resistance furnace and calcinate for 4 hours to obtain nano-powder materials with a particle size of 28-41nm.

Embodiment 3

[0016] Example 3: Weigh 200 g of tungsten hexachloride and chromium oxalate according to the atomic ratio of W and Cr of 100:55, dissolve them in 200 mL of 30% ethanol aqueous solution, heat and stir at 60 ° C until completely dissolved, and prepare into solution (I). Dissolve titanium nitrate in water to make 0.45mol / L solution (II). Keep stirring at 60°C, add solution (II) to solution (I) so that the atomic ratio of W to Ti is 100:35, then slowly add ammonia water drop by drop until the pH is 7, cool to room temperature and continue stirring After 1 hour, let it stand for 8 hours, filter the precipitate under reduced pressure, and dry it at 110°C for 2 hours. After fully grinding, slowly raise the temperature to 420°C in a high-temperature box-type resistance furnace for calcination for 4 hours to obtain a nanopowder material. The particle size is 30-42nm.

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Abstract

The present invention provides the manometer composite oxide sensitive material of ammonia, which is characterized in that the present invention is combined by WO3, Cr2O3 and TiO2; wherein, the atom ratio of W and the Cr is 100 to 45 to 55; the atom ratio of the W and the Ti is 100 to 27 to 36; particle size distribution is between 25 and 45 nm. An ammonia sensor prepared by the sensitive material provided by the present invention has good selectivity and sensitivity for the detection of the trace amount ammonia gas in the air; and no disturbance is caused among common coexistent gases.

Description

technical field [0001] The present invention relates to a sensitive material for monitoring ammonia in the air, especially made of WO 3 、Cr 2 o 3 and TiO 2 Composed of nanocomposite oxide sensitive materials. It belongs to the field of sensor technology. Background technique [0002] Ammonia (NH 3 ) is an alkaline, colorless gas with a strong pungent odor. Ammonia in the air is often adsorbed on human skin and mucous membranes, conjunctiva, and respiratory and throat mucous membranes because it is easily soluble in water. When the concentration of ammonia in the air is 0.5mg / m 3 When the ammonia concentration in the air exceeds 80mg / m, it can make people feel a pungent smell 3 In a short period of time, it can cause tearing, sore throat, cough, chest tightness, and dyspnea, accompanied by dizziness, headache, nausea, vomiting, fatigue and other symptoms. In severe cases, pulmonary edema and respiratory tract lesions can also occur. People living in a low-concentratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N37/00
Inventor 周考文张倩何悦
Owner BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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