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Ammonia sensing material

An ammonia and dye technology, which is applied in the direction of chemical reaction of materials and material analysis by observing the impact on chemical indicators, which can solve problems such as operator injury, semiconductor process impact, and machine damage. , to achieve the effect of improving detection efficiency, improving detection sensitivity and speed, and saving costs

Active Publication Date: 2010-03-10
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Ammonia sensing material

Examples

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Effect test

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 4N sulfuric acid (sulfuric acid 98%) solution and slowly drop it in to control the pH value of the solution to 10.5. gelatinous. 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 cake and dry it at 110°C for 6 hours, and ...

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 two solutions 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 0.3g of aluminosilicate mesoporous materials with different silicon-to-aluminum ratios and 0.001g of indicator bromocresol green (bromocresol green) or bromocresol purple (bromocresol purple) and dissolve them in 100mL of solvent aceto...

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Abstract

The invention provides an ammonia sensing material, which comprises a carrier and a dye, wherein the carrier comprises a silicate mesoporous material of which the specific area is more than 700m<2> / g;the dye comprises an ammonia sensing color-change dye which is embedded into the carrier; and when the ammonia sensing material is exposed in an ammonia environment, the ammonia sensing color-changedye changes color. The silicate mesoporous material is modified with a metal to prepare another ammonia sensing material which also can detect ammonia through the color change of the ammonia sensing color-change 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 1ppm (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 Applications(China)
IPC IPC(8): G01N21/78
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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