Fluorescent carbon dot/mesoporous molecular sieve composite luminescent material as well as preparation and application of fluorescent carbon dot/mesoporous molecular sieve composite luminescent material

A technology of mesoporous molecular sieves and fluorescent carbon dots, applied in the fields of luminescent materials, fluorescence/phosphorescence, analytical materials, etc., can solve the problems of production and application limitations, high price of precious metals, and achieve short time consumption, high sensitivity and selectivity, and low cost. Effect

Inactive Publication Date: 2016-07-13
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In previous studies, luminescent complexes of noble metals such as platinum and ruthenium were often used for oxyge

Method used

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  • Fluorescent carbon dot/mesoporous molecular sieve composite luminescent material as well as preparation and application of fluorescent carbon dot/mesoporous molecular sieve composite luminescent material
  • Fluorescent carbon dot/mesoporous molecular sieve composite luminescent material as well as preparation and application of fluorescent carbon dot/mesoporous molecular sieve composite luminescent material
  • Fluorescent carbon dot/mesoporous molecular sieve composite luminescent material as well as preparation and application of fluorescent carbon dot/mesoporous molecular sieve composite luminescent material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Preparation of carbon dots / MCM-41 composite luminescent material

[0036] (1) Preparation of silane-functionalized fluorescent carbon dots: Add 30mL of silane coupling agent KH-602 into a 100mL three-necked flask, degas with nitrogen for 10 minutes, and heat to 240°C. Quickly add 1.5g of anhydrous citric acid while stirring, take it out after 3 minutes of constant temperature reaction, and cool it down to room temperature naturally. After the crude product is purified three times with petroleum ether, the final silane-functionalized fluorescent carbon quantum dots are obtained;

[0037] (2) Preparation of inorganic carrier mesoporous material MCM-41: can be obtained by referring to literature methods (C.T.Kresge, M.E.Leonowicz, W.J.Roth, J.C.Vartuli, J.S.Beck, Nature, 1992,359,710; J.S.Beck, J.C.Vartuli, W.J.Roth, M.E.Leonowicz, C.T.Kresge, K.D.Schmitt, C.T.-W.Chu, D.H.Olson, E.W.Sheppard, S.B.McCullen, J.B.Higgins, J.L.Schlenker, J.Am.Chem.Soc.1992,114,10834...

Embodiment 2

[0039] Example 2: Preparation of carbon dots / MCM-48 composite luminescent material

[0040] (1) Prepare silane functionalized fluorescent carbon dots by the method of Example 1;

[0041] (2) Preparation of inorganic carrier mesoporous material MCM-48: it can be obtained by referring to literature methods (D.Zhao, Q.Huo, J.Feng, B.F.Chmelka, G.D.Stucky, J.Am.Chem.Soc.1998,120, 6024; J.Xu, Z.H.Luan, L.Kevan, Chem.Mater, 1998, 10, 3690-3698), the specific steps are: according to TEOS: CTAB: NaOH: H 2O=1:0.6:0.47:65 ratio, weigh 10.95g cetyltrimethylammonium bromide (CTAB), dissolve it in 59.1mL deionized water, then add 0.94g NaOH, and maintain the system at 35°C Stir at constant temperature for a period of time to dissolve it, slowly add 9.7mL tetraethyl orthosilicate (TEOS), and continue stirring for 4 to 5 hours. Move it into a polytetrafluoroethylene-lined reactor, crystallize at 100°C for 48h, filter, wash with deionized water, and dry at 60°C for 12h. Put it into a muffl...

Embodiment 3

[0043] Example 3: Preparation of carbon dots / SBA-15 composite luminescent material

[0044] (1) Prepare silane functionalized fluorescent carbon dots by the method of Example 1;

[0045] (2) Preparation of inorganic carrier mesoporous material SBA-15: It can be obtained according to the literature method (B.F.Lei, L.Wang, H.R.Zhang, Y.L.Liu, H.W.Dong, M.T.Zheng, X.H.Zhou, SensActuatorsBChem.2016,10,1016) , the specific steps are: Weigh 6g of P123 into a round bottom flask, add 225mL of a mixture containing 180mL of 2mol / L hydrochloric acid and 45mL of deionized water, stir in a water bath at 35°C until it becomes clear, and add 13.8mL of orthosilicic acid dropwise Ethyl ester, kept stirring at 25°C for 24h. Put it into a polytetrafluoroethylene reactor lined with water heat treatment at 100°C for 48 hours, take it out after cooling, filter it with suction, and wash it repeatedly with deionized water for 5 times and once with ethanol, and dry the obtained powder in an oven at ...

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Abstract

The invention belongs to the field of composite luminescent materials and discloses a fluorescent carbon dot/mesoporous molecular sieve composite luminescent material, a preparation method of the composite luminescent material and application of the composite luminescent material in the aspect of oxygen sensing. The preparation method of the composite luminescent material comprises the following steps: (1) preparing silane functionalized fluorescent carbon dots: under a stirring condition, adding anhydrous citric acid into a silane coupling agent and reacting at a constant temperature; purifying to obtain silane functionalized fluorescent quantum dots; (2) preparing the fluorescent carbon dot/mesoporous molecular sieve composite luminescent material: under the condition of taking ethanol as a solvent, taking a mesoporous molecular sieve to react with the silane functionalized fluorescent carbon dots prepared in the step (1) and purifying to obtain the fluorescent carbon dot/mesoporous molecular sieve composite luminescent material. The preparation method is simple, and the raw materials are low in price and have no toxin; the prepared composite luminescent material has high sensitivity and selectivity, stable performance, and quick response, the emission intensity is sensitive to oxygen concentration, and the composite luminescent material is an economical type green and environment-friendly oxygen sensing material.

Description

technical field [0001] The invention belongs to the field of composite luminescent materials, in particular to a fluorescent carbon dot / mesoporous molecular sieve composite luminescent material and its preparation and application in oxygen sensing. Background technique [0002] With the advancement of science and technology, sensing technology has played a key role in various aspects such as environmental protection, national defense construction, and space exploration. Since Freeman et al first developed a chemiluminescent hydrogen peroxide sensor in 1978, optical sensors have attracted more and more attention from analytical chemists. The luminescence intensity, luminescence peak position or excited state lifetime of luminescent chemical sensing materials change with the surrounding chemical environment, so as to realize the sensing and detection of the analyte. Sensing and detection methods based on luminescence do not have the interference of scattered light background ...

Claims

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Application Information

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IPC IPC(8): C09K11/65G01N21/64
CPCC09K11/65G01N21/643G01N2021/6432
Inventor 雷炳富王丽张浩然周晓华刘应亮庄健乐何友玲
Owner SOUTH CHINA AGRI UNIV
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