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Ammonia sensing material

A technology of ammonia gas and dyes, which is applied in the direction of using chemical indicators for analysis, etc., can solve problems such as machine damage, influence on semiconductor technology, and operator injury, and achieve cost savings, improve detection sensitivity and speed, and improve detection efficiency. Effect

Active Publication Date: 2011-12-14
IND TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The concentration of ammonia gas will not only affect the semiconductor process, but also cause damage to the machine and harm to the operator

Method used

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preparation example Construction

[0024] The preparation method of ammonia gas sensing material of the present invention comprises the following steps:

[0025] (a) First prepare the initial solution, dissolve the required sodium metasilicate (sodium metasilicate) in deionized water, and then stir the solution evenly.

[0026] (b) Then prepare a strong acid (such as sulfuric acid, hydrochloric acid) solution and slowly drop it into the above solution to control the pH value of the solution to about 9-11. At this time, the solution will form a gel.

[0027] (c) Then prepare a surfactant, such as cetyltrimethylammonium bromite (CTAB), weigh the required surfactant and add it to deionized water for stirring. After stirring, slowly drop it into the pre-step In the solution, when the surfactant is dropped, the solution will have a flocculation phenomenon. The role of the surfactant is to provide a template for the preparation of mesoporous materials.

[0028] (d) After stirring for 3 hours, put the solution into ...

Embodiment 1

[0035] Example 1: Preparation of ammonia sensing material containing silicate mesopore material

[0036] Weigh 21.2g of sodium metasilicate (sodium metasilicate) into 80mL of deionized water and stir for 30 minutes, then prepare a 4N sulfuric acid (sulfuric acid98%) solution and slowly drop it in to control the pH value of the solution to 10.5. At this time, the solution will form a gel shape. Then configure the surfactant cetyltrimethylammonium bromite (cetyltrimethylammonium bromite, CTAB), weigh CTAB 7.2g and add 25mL of deionized water to stir, after stirring, slowly drop into the pre-step solution, in the drop When CTAB is added, the solution will flocculate. After stirring for 3 hours, the solution was placed in a pressure cooker and placed in an oven, and synthesized by a hydrothermal method at 145° C. for 36 hours. Take it out from the oven, let it cool down, and perform suction filtration, and rinse it several times with deionized water, then take out the filter cak...

Embodiment 2

[0038] Example 2: Preparation of ammonia sensing material containing aluminosilicate mesopore material

[0039] The synthesis method of porous materials in aluminosilicates with different silicon / aluminum ratios, first weigh the required sodium metasilicate (sodium metasilicate) and add 80mL of deionized water, the sodium metasilicate required for different silicon / aluminum ratios As shown in Table 1, add the required aluminum sulfate (aluminum sulfate) into 20mL deionized water, mix the seed solution and stir for 30 minutes. Change to 10 hours.

[0040] Table 1

[0041] Silicon / aluminum ratio Added aluminum sulfate weight (g)

[0042] 25 0.684

[0043] 50 0.342

[0044] 75 0.228

[0045] 100 0.171

[0046] 150 0.114

[0047] Then measure 0.3 g of different silicon-aluminum ratios of aluminosilicate mesoporous materials and 0.001 g of indicator bromocresol green (b...

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Abstract

The invention provides an ammonia sensing material, which includes: a carrier, including a silicate mesopore material, whose specific surface area is greater than 700m2 / g; and a dye, including a color-changing dye for ammonia sensing, wherein the ammonia The gas-sensing color-changing dye is embedded in the carrier, and when the ammonia-gas sensing material is exposed to the ammonia environment, the ammonia-gas-sensing color-changing dye produces a color change. By modifying the hole material in the above-mentioned silicate with a metal, another kind of ammonia gas sensing material can be obtained, which can also detect ammonia gas by the color change of the ammonia gas sensing color-changing dye.

Description

technical field [0001] The present invention relates to an ammonia sensing material, and in particular to an ammonia sensing material with a mesoporous material as a carrier. Background technique [0002] Ammonia is a gas that is ubiquitous on the earth. It has the characteristics of odor, irritation and corrosion. In my country's air pollution prevention and control regulations, ammonia is listed as a toxic pollutant, and its regulations and standards limit the perimeter. The concentration shall not exceed lppm (Environmental Protection Administration, Taiwan Executive Yuan, 2003). Ammonia has a significant impact on the human body and the environment. When the concentration of ammonia in the air is close to 700ppm, it will cause symptoms such as eye irritation and soreness. If it exceeds 5000ppm, it will be fatal in a short time. Therefore, the concentration of ammonia control appears to be very important. [0003] Coupled with the rapid development of high-tech industrie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/22
Inventor 郭峻男李寿南颜绍仪施惠雅白曛绫江学诗
Owner IND TECH RES INST
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