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Preparation method of high-sensitivity formaldehyde gas sensor

A formaldehyde gas, high-sensitivity technology, applied in the field of preparation of high-sensitivity formaldehyde gas sensors, can solve problems such as pollution, and achieve the effects of high sensitivity, good stability and easy preparation

Inactive Publication Date: 2014-03-19
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is easy to operate and has good selectivity, but the polarographic analysis method has relatively high requirements for the pretreatment of the sample, and the "dropping mercury electrode" used is polluted. Currently, it is mostly used for the detection of formaldehyde in food and food packaging materials.

Method used

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  • Preparation method of high-sensitivity formaldehyde gas sensor

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preparation example Construction

[0019]2. Preparation of L-cysteine-wrapped quantum dots: first dissolve 0.1-2.0g cadmium chloride with 10-100ml ultrapure water, then dissolve 0.1-2.0g L-cysteine ​​with 10-100ml ultrapure water (L-cys), and then put the three-necked bottle with magnets into the heat-collecting constant temperature heating stirrer (DF-101S), and pass nitrogen gas under ice water conditions to ensure that all the air in the three-necked bottle is discharged. Add the dissolved cadmium chloride solution into the three-necked bottle, add 10-200ml ultrapure water at the same time, turn on the stirrer to stir, and pass nitrogen gas for 10-100min; after that, add the dissolved L-cys solution to the three-necked bottle, and add 10-200ml of ultra-pure water, adjust the pH to 3-14 with 0.5-4mol / L NaOH (this process, the reaction solution changes from clear to milky white and then becomes clear), similarly, pass nitrogen gas for 10-100min, after that, add to the reaction solution NaHTe (1-6ml) solution p...

Embodiment 1

[0025] 1. Preparation of NaHTe precursor: Take 0.04g of sodium borohydride, 0.9g of tellurium powder and 3ml of water, react in a syringe, leave it at room temperature for 5 hours and take it out. The solution turns from black to light red or purple.

[0026] 2. Preparation of quantum dots wrapped by L-cysteine: first dissolve 0.4g cadmium chloride with 50ml ultrapure water, dissolve 0.4g L-cysteine ​​(L-cys) with 25ml ultrapure water, and then Put the three-necked bottle with magnets into the heat-collecting constant temperature heating stirrer (DF-101S), pass nitrogen gas under ice water conditions to ensure that all the air in the three-necked bottle is exhausted, and then add dissolved chlorine into the three-necked bottle Cadmium chloride solution, add 125ml of ultrapure water at the same time, turn on the stirrer to stir, and pass nitrogen gas for 20min; after that, add the dissolved L-cys solution into the three-necked flask, add 140ml of ultrapure water at the same time...

Embodiment 2

[0031] 1. Preparation of NaHTe precursor: Take 0.03g of sodium borohydride, 0.9g of tellurium powder and 3ml of water, react in a syringe, place it at room temperature for 5 hours and take it out. The solution turns from black to light red or purple.

[0032] 2. Preparation of quantum dots wrapped by L-cysteine: first dissolve 0.4g cadmium chloride with 50ml ultrapure water, dissolve 0.4g L-cysteine ​​(L-cys) with 25ml ultrapure water, and then Put the three-necked bottle with magnets into the heat-collecting constant temperature heating stirrer (DF-101S), pass nitrogen gas under ice water conditions to ensure that all the air in the three-necked bottle is exhausted, and then add dissolved chlorine into the three-necked bottle Cadmium chloride solution, add 125ml of ultrapure water at the same time, turn on the stirrer to stir, and pass nitrogen gas for 20min; after that, add the dissolved L-cys solution into the three-necked flask, add 140ml of ultrapure water at the same time...

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Abstract

The invention relates to a preparation method of a novel high-sensitivity formaldehyde gas sensor. The preparation method is characterized by comprising the steps of assembling carboxy methylated cellulose (CMC), PDDA, a quantum dot and a bovine serum albumin (BSA) on a glass slide by using a layer by layer self-assembly technology to form a quantum point multilayer film formaldehyde sensor, and carrying out quantitative detection on formaldehyde by using fluorescence change before and after contacting the formaldehyde. An experiment comprises the following steps of 1. preparing a NaHTe precursor to obtain a light red NaHTe liquid; 2. preparing a quantum point wrapped by L-cysteine; 3. preprocessing a quantum point multilayer film carrier quartz plate; and 4. assembling a quantum point multiple film, and carrying out layer by layer self assembling on the PDDA and the quantum point through an electrostatic interaction to obtain the formaldehyde gas sensor. The formaldehyde gas sensor for detecting the formaldehyde is simple in preparation process, excellent in detection effect, easy to actually popularize and apply, low in cost, free of pollution to the environment, and convenient to recycle.

Description

technical field [0001] The invention relates to formaldehyde detection technology, in particular to a preparation method of a portable high-sensitivity formaldehyde gas sensor based on quantum dot fluorescence resonance energy transfer. Background technique [0002] Formaldehyde is defined as carcinogenic and teratogenic shape material by the World Health Organization, is the allergen of generally acknowledging, also is one of potential strong mutagen. Formaldehyde has reproductive toxicity, can reduce immunity, and has teratogenic, sudden and carcinogenic effects on animals. Formaldehyde can enter the human body through processes such as eating, breathing or skin contact. The International Association for Research on Cancer has recommended that formaldehyde be treated as a suspected carcinogen. The acute toxicity of formaldehyde is manifested as a strong irritation to the skin, eyes and respiratory tract and an anesthetic effect on the central nervous system. Low concent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 许世超何磊张晨倪柳松孙孟娜
Owner TIANJIN POLYTECHNIC UNIV
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