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Preparation method of fluorescent-response silica aerogel thin film

A silica and aerogel technology, applied in fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of unsuitability for large-area preparation of thin films, decreased mechanical properties of thin films, and strict molecular structure requirements, saving preparation costs, Simple to use equipment and simple method

Inactive Publication Date: 2015-10-14
YANGZHOU TIANCHEN FINE CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] LB membrane technology and layer-by-layer assembly technology can precisely control the composition, but this technology has the disadvantages of demanding molecular structure and complicated operation process.
[0005] Polymerization is a simple synthesis method, but rare earth compounds are highly polar and have poor compatibility with organic polymers with less polarity, resulting in a decrease in the mechanical properties of this type of film and low transparency
[0006] The pulsed laser ablation method has certain applicability and the preparation process is simple and easy, but the equipment is expensive and the cost is high, so it is not suitable for large-scale preparation of thin films

Method used

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  • Preparation method of fluorescent-response silica aerogel thin film
  • Preparation method of fluorescent-response silica aerogel thin film
  • Preparation method of fluorescent-response silica aerogel thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 20 mL tetraethyl orthosilicate dropwise into 21 mL ethanol, mix and stir evenly, add 0.008 mol / L oxalic acid solution 7 mL, stir for 10 h for hydrolysis reaction, then slowly add 0.5 mol / L ammonia solution 0.4 mL, after stirring for another 25 min, add 0.4 mL of 100 mg / L rhodamine 6G ethanol solution, and stir to obtain fluorescent silica sol.

[0039] After immersing the cleaned and dried glass substrate vertically in the fluorescent silica sol for 20 s, the film was coated at a pulling rate of 800 μm / s.

[0040] The obtained wet gel film was dried under normal pressure in an ethanol atmosphere to obtain a silica airgel fluorescent film with a thickness of 112 nm, a sensitive fluorescence response and a fluorescence lifetime of 4.41 ns.

Embodiment 2

[0042] Add 20 mL of tetraethyl orthosilicate dropwise into 21 mL of ethanol, mix and stir evenly, add 7 mL of 0.008 mol / L oxalic acid solution, stir for 11 hours and then slowly add 0.4 mL of 0.5 mol / L ammonia solution, After stirring for 30 min, add 0.8 mL of 100 mg / L rhodamine 6G ethanol solution, and stir to obtain fluorescent silica sol.

[0043] After immersing the cleaned and dried glass substrate vertically in the fluorescent silica sol for 30 s, the film was coated at a pulling rate of 900 μm / s.

[0044] The obtained wet gel film was dried under normal pressure in an ethanol atmosphere to obtain a silica airgel fluorescent film with a thickness of 116 nm, a sensitive fluorescence response and a fluorescence lifetime of 4.81 ns.

Embodiment 3

[0046] Add 22 mL of tetraethyl orthosilicate to 23 mL of ethanol dropwise, mix and stir evenly, add 7 ml of 0.008 mol / L oxalic acid solution, stir for 12 h for hydrolysis, then slowly add 0.4 mL of 0.5 mol / L ammonia solution dropwise , after stirring for 20 min, add 0.8 mL of 100 mg / L rhodamine B ethanol solution, and stir to obtain fluorescent silica sol.

[0047] After immersing the cleaned and dried glass substrate vertically in the fluorescent silica sol for 50 s, the film was coated at a pulling rate of 1000 μm / s.

[0048] The obtained wet gel film was dried under normal pressure in an ethanol atmosphere to obtain a silica airgel fluorescent film with a thickness of 115 nm, a sensitive fluorescence response and a fluorescence lifetime of 4.88 ns.

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Abstract

The invention discloses a preparation method of a fluorescent-response silica aerogel thin film, and belongs to the functional material technical field. The preparation method comprises the steps: dipping a clean glass substrate in a fluorescent silica sol, then lifting from the glass substrate to obtain a wet gel thin film, and then carrying out ordinary pressure drying on the wet gel thin film in an atmosphere of ethanol, to obtain the silica aerogel fluorescent thin film. The silica fluorescent sol is characterized by being prepared by the steps: firstly, mixing evenly tetraethyl orthosilicate with ethanol, then adding an oxalic acid solution, after a hydrolysis reaction is finished, adding ammonia water and an ethanol solution of a dye, and evenly stirring, to obtain the silica fluorescent sol. The method is simple and convenient, simple in used equipment, good in dispersibility, low in running cost, and suitable for preparation of the silica aerogel thin films doped with different functional molecules.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a preparation process of a fluorescence-responsive silicon dioxide airgel film. Background technique [0002] With the development of science and technology and the improvement of the quality of life, the identification and detection of substances in biology and the environment has become an important application of chemistry in daily life. Traditional methods such as atomic absorption spectrometry, plasma emission spectrometry, high performance liquid chromatography, gas chromatography, and mass spectrometry have been used to detect the content of specific components, but these methods have many disadvantages, such as expensive equipment, operation Complexity, long detection time, low detection limit, etc. Fluorescence analysis refers to the method of qualitative and quantitative analysis of substances according to the intensity of fluorescence emitted ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 谢吉民陈高远魏巍陈国云刘润兴朱建军罗瑞余辉罗志斌
Owner YANGZHOU TIANCHEN FINE CHEM
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