CN107033887B - A kind of preparation method of the carbon quantum dot with the transmitting of visible region multicolor fluorescence - Google Patents

A kind of preparation method of the carbon quantum dot with the transmitting of visible region multicolor fluorescence Download PDF

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CN107033887B
CN107033887B CN201710329658.0A CN201710329658A CN107033887B CN 107033887 B CN107033887 B CN 107033887B CN 201710329658 A CN201710329658 A CN 201710329658A CN 107033887 B CN107033887 B CN 107033887B
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quantum dot
carbon quantum
visible region
transmitting
preparation
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CN107033887A (en
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杨培慧
赖志强
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Jinan University
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    • C09K11/00Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/65Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing carbon
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    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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    • C01P2004/01Particle morphology depicted by an image
    • C01P2004/04Particle morphology depicted by an image obtained by TEM, STEM, STM or AFM
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00Particle morphology
    • C01P2004/60Particles characterised by their size
    • C01P2004/64Nanometer sized, i.e. from 1-100 nanometer
    • CCHEMISTRY; METALLURGY
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Abstract

The present invention discloses a kind of preparation method of carbon quantum dot with the transmitting of visible region multicolor fluorescence, belongs to carbon material technical field.This method comprises the following steps: using amino acid, chemiluminescent agent as carbon source, the pH of reacting solution being adjusted to alkalinity, is inserted into working electrode, stirring applies voltage, and reaction obtains reaction mixture;Reaction mixture is collected, will salt out, obtain carbon quantum dot solution;Carbon quantum dot solution is dried in vacuo, the carbon quantum dot with the transmitting of visible region multicolor fluorescence is obtained.The method of the invention has the characteristics that flexible operation, easy to control and last handling process are simple;Carbon source is cheap, simple and easy to get, and mass production is facilitated to prepare carbon quantum dot.Carbon quantum dot of the invention shows blue, green, red multicolor luminous property, has widened carbon quantum dot in the application of multicolor fluorescence sensory field.Fluorescence probe splendid as biocompatibility simultaneously provides possibility to expand carbon quantum dot in the application of field of bioanalysis.

Description

A kind of preparation method of the carbon quantum dot with the transmitting of visible region multicolor fluorescence
Technical field
The invention belongs to carbon material technical fields, and in particular to a kind of carbon quantum with the transmitting of visible region multicolor fluorescence The preparation method of point.
Background technique
Carbon quantum dot (Carbon quantum dots, CQDs) is as a kind of noticeable carbon nanomaterial, because of its tool There are unique optical property and good biocompatibility, is shown in fields such as biomedicine, photoelectric device, energy and materials Wide application prospect.Currently, hydro-thermal method, microwave method etc. are used about most of synthetic method of carbon quantum dot both at home and abroad, this The carbon quantum dot that a little methods are prepared mainly emits blue-fluorescence, and there are also transmitting blue and green fluorescences, however, simultaneously Document report with blue, green, red fluorescence transmitting carbon quantum dot preparation method is seldom, such as uses hydrothermal synthesis technology system Its multicolor luminous red light intensity of standby carbon quantum dot is very weak (Carbon, 2016,96,166).And use microwave-assisted synthesis The multicolor luminous carbon quantum dot of (Adv.Mater.2015,27,7782) preparation, needs using toxic volatile presoma, harshness Reaction condition or complicated and time consumption subsequent processing.Since electrochemistry formated technology has many advantages, such as mild condition, easy to operate, It has been employed successfully in the preparation of various nano materials.It is also seldom using the carbon quantum dot report of technology preparation at present, for example, with CH3CN is as carbon source, with expensive ionic liquid (BMIMPF6) it is used as medium, electrolytic preparation only has the carbon of blue, green emitting Quantum dot (Nanoscale, 2016,8,5470).In order to seek a kind of cheap, the mild preparation side of multicolor luminous carbon quantum dot Method, we have developed it is a kind of based on electrochemistry formated technology combine new presoma develop a kind of mild synthetic method of green, obtain Obtained the carbon quantum dot with the transmitting of visible region multicolor fluorescence and controllable light intensity.The technology cures carbon quantum dot in biology The fields such as polychrome biomarker and bio-imaging have great importance and wide application prospect.
Summary of the invention
In order to overcome the disadvantages and deficiencies of the prior art, the purpose of the present invention is to provide one kind to have visible region polychrome The preparation method of the carbon quantum dot of fluorescent emission.
The purpose of the present invention is to provide one kind by with novel mixing precursor, in conjunction with electrochemistry formated technology, to change It learns luminescence reagent (including luminol and its derivative, different luminol and its derivative, lucigenin etc.), amino acid (including non-pole Property side chain amino acid, unionized polar side chains) be carbon source come prepare with visible region multicolor fluorescence transmitting carbon amounts Sub- point.
Another object of the present invention is to provide what is be prepared by above-mentioned preparation method to have visible region polychrome glimmering Photoemissive carbon quantum dot.
The purpose of the invention is achieved by the following technical solution:
A kind of preparation method of the carbon quantum dot with the transmitting of visible region multicolor fluorescence, is electrochemistry constant potential method, Include the following steps:
(1) using amino acid, chemiluminescent agent as carbon source, the pH of reacting solution is adjusted to alkalinity, working electrode is inserted into, stirs It mixes, applies voltage, reaction obtains reaction mixture;
(2) reaction mixture is collected, will salt out, obtain carbon quantum dot solution;
(3) carbon quantum dot solution is dried in vacuo, obtains powdery solid, the powdery solid has visible region polychrome glimmering Photoemissive carbon quantum dot.
The concentration of amino acid is 0.1~5mg/mL in reacting solution described in step (1);Preferably 0.3~3mg/ mL。
The concentration of chemiluminescent agent is 0.1~5mg/mL in reacting solution described in step (1);Preferably 0.1~ 3mg/mL;
The amino acid includes nonpolar side chains and unionized polar side chains;
Preferably, the amino acid is L-phenylalanine, L-Trp and tyrosine.
The chemiluminescent agent includes luminol and its derivative, different luminol and its derivative and lucigenin etc..
It is preferably that pH is adjusted to 9~14 that pH described in step (1), which is adjusted to alkalinity,;
Working electrode described in step (1) is preferably platinum plate electrode and to electrode gauze platinum electrode.
The working electrode is platinum plate electrode (3 × 3cm of large area2), it is the gauze platinum electrode (3 of large area to electrode ×3cm2)。
Voltage described in step (1) is 2~10 volts of voltages;Preferably 2~8 volts of voltages.
The time of reaction described in step (1) is 1~6 hour;Preferably 1~4 hour.
Reaction described in step (1) is to react under 30~70 DEG C of water bath conditions;Preferably 30~60 DEG C.
It will be salted out described in step (2) and use 3000Da dialysis membrane to dialyse in pure water preferably to remove remnants' Salt.
Vacuum drying described in step (3) is preferably vacuum freeze drying.
A kind of carbon quantum dot with the transmitting of visible region multicolor fluorescence, is prepared by above-mentioned preparation method.The carbon Quantum dot is the carbon quantum dot with blue, green, red multicolor fluorescence emission characteristics.
The method is the preparation of carbon source electrochemistry with blue, green, red more using amino acid, chemiluminescent agent in water solution system The carbon quantum dot of the color characteristics of luminescence can obtain having blue, green, red multicolor luminous characteristic without complicated subsequent moditied processing Carbon quantum dot.Therefore prepared carbon quantum dot can have great application value in field of fluorescence, have preferable application Prospect.
The present invention compared with the existing technology, have following advantages and effects
(1) method of the present invention is carried out in water solution system, avoids the use of some toxic organic reagents, more Add simple green.
(2) electrochemical method of the present invention prepares carbon quantum dot, has flexible operation, easy to control and last handling process Simple feature.
(3) the method for the invention, carbon source be common chemical reagent amino acid and chemical illuminating reagent, it is cheap, It is simple and easy to get, facilitate mass production to prepare carbon quantum dot.
(4) the method for the invention is in water-soluble system, using amino acid, chemical illuminating reagent as carbon source, using electrochemistry side Method can regulate and control its fluorescence property by controlling the various concentration of carbon quantum dot, therefore can prepare according to actual needs with excellent The carbon quantum dot of good fluorescence property.
(5) carbon quantum dot of the method for the invention synthesis shows blue, green, red multicolor luminous property, has widened carbon Application of the quantum dot in multicolor fluorescence sensory field.Fluorescence probe splendid as biocompatibility simultaneously, to expand carbon quantum Point provides possibility in the application of field of bioanalysis.
Detailed description of the invention
Fig. 1 is the electrochemistry preparation flow schematic diagram for the carbon quantum dot that there is visible region multicolor fluorescence to emit.
Fig. 2 is the morphology characterization figure for the carbon quantum dot that there is visible region multicolor fluorescence to emit;Wherein, figure A0 is embodiment The TEM figure of the carbon quantum dot of 1 preparation, figure A1 are the grain size distribution of the carbon quantum dot;Scheming B0 is carbon quantum prepared by embodiment 2 The TEM figure of point, figure B1 are the grain size distribution of the carbon quantum dot;Scheme the TEM figure that C0 is carbon quantum dot prepared by embodiment 3, figure C1 is the grain size distribution of the carbon quantum dot.
Fig. 3 is the Fluorescence behaviour figure of the carbon quantum dot with the transmitting of visible region multicolor fluorescence prepared in embodiment 1.
Fig. 4 is the Fluorescence behaviour figure of the carbon quantum dot with the transmitting of visible region multicolor fluorescence prepared in embodiment 2.
Fig. 5 is the Fluorescence behaviour figure of the carbon quantum dot with the transmitting of visible region multicolor fluorescence prepared in embodiment 3.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited In this.
The electrochemistry preparation flow schematic diagram of carbon quantum dot with the transmitting of visible region multicolor fluorescence, as shown in Figure 1.
Embodiment 1
(1) prepare reaction solution: it is molten that the 100mL NaOH that pH is 9 is added in 0.3g L-phenylalanine, 0.01g lucigenin In liquid, stir evenly stand-by.
(2) two pieces of platinum plate electrodes will be inserted into resulting solution as working electrode and to electrode, stirring applies voltage 10V, reacts 4h by 30 DEG C of bath temperature.
(3) after reaction solution is cooled to room temperature, by solution use 3000Da dialysis membrane dialyse in pure water 1 day it is residual to remove Remaining salt.Obtained liquid up to pulverulent solids, that is, has visible region multicolor fluorescence hair after vacuum freeze drying The carbon quantum dot penetrated, saves backup.The morphology characterization figure and size distribution of carbon quantum dot are shown in Fig. 2A 0 and Fig. 2A 1.
(4) the Fluorescence behaviour characterization of carbon quantum dot: fluorescence spectra: λem=480nm, λem=510nm, λem=620nm. See Fig. 3.
Embodiment 2
(1) it prepares reaction solution: the 100mL NaOH solution that pH is 11 is added in 0.03g L- color base acid, 0.2g luminol In, it stirs evenly stand-by.
(2) two pieces of platinum plate electrodes will be inserted into resulting solution as working electrode and to electrode, stirring applies voltage 4V, reacts 2h by 50 DEG C of bath temperature.
(3) after reaction solution is cooled to room temperature, by solution use 3000Da dialysis membrane dialyse in pure water 1 day it is residual to remove Remaining salt.Obtained liquid up to pulverulent solids, that is, has visible region multicolor fluorescence hair after vacuum freeze drying The carbon quantum dot penetrated, saves backup.The morphology characterization and particle size distribution figure of carbon quantum dot are shown in Fig. 2 B0 and Fig. 2 B1.
(4) the Fluorescence behaviour characterization of carbon quantum dot: fluorescence spectra: λem=485nm, λem=530nm, λem=620nm. See Fig. 4.
Embodiment 3
(1) it prepares reaction solution: the 100mL NaOH solution that pH is 14 is added in 0.1g tyrosine, 0.3g different luminol In, it stirs evenly stand-by.
(2) two pieces of platinum plate electrodes will be inserted into resulting solution as working electrode and to electrode, stirring applies voltage 2V, reacts 1h by 60 DEG C of bath temperature.
(3) after reaction solution is cooled to room temperature, by solution use 3000Da dialysis membrane dialyse in pure water 1 day it is residual to remove Remaining salt.Obtained liquid up to pulverulent solids, that is, has visible region multicolor fluorescence hair after vacuum freeze drying The carbon quantum dot penetrated, saves backup.The morphology characterization and particle size distribution figure of carbon quantum dot are shown in Fig. 2 C0 and Fig. 2 C1.
(4) the Fluorescence behaviour characterization of carbon quantum dot: fluorescence spectra: λem=485nm, λem=550nm, λem=620nm. See Fig. 5.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention, It should be equivalent substitute mode, be included within the scope of the present invention.

Claims (9)

1. a kind of preparation method of the carbon quantum dot with the transmitting of visible region multicolor fluorescence, it is characterised in that including walking as follows It is rapid:
(1) using amino acid, chemiluminescent agent as carbon source, the pH of reacting solution is adjusted to alkalinity, is inserted into working electrode, is stirred, Apply voltage, reaction obtains reaction mixture;
(2) reaction mixture is collected, will salt out, obtain carbon quantum dot solution;
(3) carbon quantum dot solution is dried in vacuo, obtains powdery solid, the powdery solid has visible region multicolor fluorescence hair The carbon quantum dot penetrated;
Chemiluminescent agent described in step (1) includes luminol and its derivative, different luminol and its derivative and lucigenin.
2. the preparation method of the carbon quantum dot according to claim 1 with the transmitting of visible region multicolor fluorescence, feature It is:
The concentration of amino acid is 0.1~5mg/mL in reacting solution described in step (1).
3. the preparation method of the carbon quantum dot according to claim 1 with the transmitting of visible region multicolor fluorescence, feature It is:
The concentration of chemiluminescent agent is 0.1~5mg/mL in reacting solution described in step (1).
4. the preparation method of the carbon quantum dot according to claim 1 with the transmitting of visible region multicolor fluorescence, feature It is:
Amino acid described in step (1) includes nonpolar side chains and unionized polar side chains.
5. the preparation method of the carbon quantum dot according to claim 1 with the transmitting of visible region multicolor fluorescence, feature It is:
It is that pH is adjusted to 9~14 that pH described in step (1), which is adjusted to alkalinity,.
6. the preparation method of the carbon quantum dot according to claim 1 with the transmitting of visible region multicolor fluorescence, feature It is:
Working electrode described in step (1) is for platinum plate electrode and to electrode gauze platinum electrode;
The working electrode is 3 × 3cm of large area2Platinum plate electrode is 3 × 3cm of large area to electrode2Gauze platinum electrode.
7. the preparation method of the carbon quantum dot according to claim 1 with the transmitting of visible region multicolor fluorescence, feature It is:
Voltage described in step (1) is 2~10 volts of voltages.
8. the preparation method of the carbon quantum dot according to claim 1 with the transmitting of visible region multicolor fluorescence, feature It is:
The time of reaction described in step (1) is 1~6 hour;
Reaction described in step (1) is to react under 30~70 DEG C of water bath conditions.
9. a kind of carbon quantum dot with the transmitting of visible region multicolor fluorescence, it is characterised in that pass through any one of claim 1~8 The preparation method is prepared.
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CN106467744A (en) * 2016-09-14 2017-03-01 暨南大学 A kind of preparation method of the carbon quantum dot with adjustable photo-electro-luminescence and photoluminescence performance

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