CN108373917A - A kind of preparation method of carbon quantum dot - Google Patents
A kind of preparation method of carbon quantum dot Download PDFInfo
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- CN108373917A CN108373917A CN201810221772.6A CN201810221772A CN108373917A CN 108373917 A CN108373917 A CN 108373917A CN 201810221772 A CN201810221772 A CN 201810221772A CN 108373917 A CN108373917 A CN 108373917A
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- quantum dot
- carbon quantum
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- flow back
- fluorescent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/65—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing carbon
Abstract
The invention discloses a kind of preparation methods of carbon quantum dot, and steps are as follows：With the nitric acid reflux wood activated charcoal of a concentration of 1.5mol/L, reaction temperature is 105 115 DEG C, and flow back 14 16h, after reaction, will react gains cooled to room temperature, and use Na2CO3It neutralizes, 20 25min is centrifuged under the conditions of 12000r/min, repeat 46 times, until obtaining yellowish-brown clear liquid, then molecular cut off is used to dialyse 4 5d for the bag filter of 3000Da to get fluorescent carbon quantum dot solution.This method is easy, quick, easy to operate, is successfully prepared the carbon quantum dot emitted with double fluorescent, can prepare on a large scale.
Description
Technical field
The present invention relates to a kind of preparation methods of carbon quantum dot.
Background technology
As a kind of novel fluorescent nano particle, not only fluorescence property is excellent for carbon quantum dot, but also preparation method is a variety of
Various, raw material is cheap, and simple and practicable, therefore, no matter being obtained for the extensive of people from preparation method or from application aspect
Concern.The preparation method of carbon quantum dot can be classified as two classes：（1）" method from top to bottom " makes the carbon material " smashing " of macroscopic view
Standby carbon quantum dot；（2）Organic molecule polymerization, carbonization are prepared carbon quantum dot by " method from bottom to top ".In general, " from upper
And laxative remedy " prepare carbon quantum dot raw material it is relatively abundant, such as candle ash, graphite powder, activated carbon, graphite rod, wherein activated carbon because
With porous structure, so being easier to prepare carbon quantum dot than other carbon materials.But it is prepared from report using activated carbon
From the point of view of carbon quantum dot, the research in terms of preparation method and simple application is also laid particular emphasis at present, has no the microcosmic knot in conjunction with activated carbon
Structure come explain carbon quantum dot fluorescence origin report.Since fluorescence property is excellent, the application range of carbon quantum dot is very extensive, packet
Include fluorescent marker, fluorescence sense, photocatalysis and photoelectric device etc..The carbon quantum dot of single fluorescent emission is passed applied to fluorescence
There are certain defects when sensor, such as based on fluorescence intensity detection temperature, ion concentration or when pH value, fluorescence intensity in addition to
Target to be detected is related, also has outside the Pass with excitating light strength and detection efficient, therefore testing result is less reliable.And with double
The carbon quantum dot of weight fluorescent emission may be designed to ratiometer fluorescent optical sensor, testing result made more may be used when applied to sensor
It leans on.But the report of the carbon quantum dot to emitting with double fluorescent is also less at present.The Fluorescence behaviour of carbon quantum dot is complex,
Carbon quantum dot prepared by distinct methods has different photoluminescent properties.The fluorescence of the carbon quantum dot of some research reports is with excitation wave
Length does not move, and the fluorescence of the carbon quantum dot of some research reports is moved with excitation wavelength；Also some carbon quantum dots are shown
Double fluorescent emits, but the relative intensity of blue-fluorescence part and green fluorescence part is again different due to the difference of preparation condition.
Since carbon quantum dot structure and Fluorescence behaviour are all more complex, so can explain carbon well still without unified theory so far
The luminescent behavior of quantum dot.And understand fully the fluorescence origin of carbon quantum dot, it not only can preferably regulate and control its fluorescence, improve its fluorescence
Quantum yield additionally aids the preparation process for improving carbon quantum dot, to realize extensive controllable preparation.
Invention content
The purpose of the present invention is to provide a kind of preparation methods of carbon quantum dot.
The present invention is realized by following technical solution：
A kind of preparation method of carbon quantum dot, includes the following steps：With the nitric acid reflux 15- of 90-100 parts of a concentration of 1.5mol/L
25 parts of wood activated charcoals, reaction temperature are 105-115 DEG C, and flow back 14-16h, after reaction, will react gains natural cooling
To room temperature, Na is used2CO3It neutralizes, 20-25min is centrifuged under the conditions of 12000r/min, repeat 4-6 times, until it is clear to obtain yellowish-brown
Liquid, then molecular cut off is used to dialyse 4-5d for the bag filter of 3000Da to get fluorescent carbon quantum dot solution；Each raw material is attached most importance to
Measure part.
Preferably, in the method, reaction temperature is 110 DEG C.
Preferably, in the method, flow back 15h.
Preferably, in the method, 22min is centrifuged under the conditions of 12000r/min.
Preferably, in the method, use molecular cut off for the bag filter of 3000Da dialysis 4.5d.
The technology of the present invention effect：
This method is easy, quick, easy to operate, is successfully prepared the carbon quantum dot emitted with double fluorescent, can prepare on a large scale.
Specific implementation mode
The essentiality content of the present invention is specifically introduced with reference to embodiment.
Embodiment 1
A kind of preparation method of carbon quantum dot, includes the following steps：With nitric acid 20 parts of wood of reflux of 95 parts of a concentration of 1.5mol/L
Activated carbon, reaction temperature are 110 DEG C, and flow back 15h, after reaction, will react gains cooled to room temperature, use
Na2CO3It neutralizes, centrifuges 22min under the conditions of 12000r/min, be repeated 5 times, until yellowish-brown clear liquid is obtained, then using retention point
The bag filter that son amount is 3000Da dialyses 4.5d to get fluorescent carbon quantum dot solution；Each raw material is parts by weight.
Embodiment 2
A kind of preparation method of carbon quantum dot, includes the following steps：With nitric acid 15 parts of wood of reflux of 90 parts of a concentration of 1.5mol/L
Activated carbon, reaction temperature are 105 DEG C, and flow back 14h, after reaction, will react gains cooled to room temperature, use
Na2CO3It neutralizes, centrifuges 20min under the conditions of 12000r/min, be repeated 4 times, until yellowish-brown clear liquid is obtained, then using retention point
The bag filter that son amount is 3000Da dialyses 4d to get fluorescent carbon quantum dot solution；Each raw material is parts by weight.
Embodiment 3
A kind of preparation method of carbon quantum dot, includes the following steps：With nitric acid 25 parts of wood of reflux of 100 parts of a concentration of 1.5mol/L
Activated carbon, reaction temperature are 115 DEG C, and flow back 16h, after reaction, will react gains cooled to room temperature, use
Na2CO3It neutralizes, centrifuges 25min under the conditions of 12000r/min, be repeated 6 times, until yellowish-brown clear liquid is obtained, then using retention point
The bag filter that son amount is 3000Da dialyses 5d to get fluorescent carbon quantum dot solution；Each raw material is parts by weight.
This method is easy, quick, easy to operate, is successfully prepared the carbon quantum dot emitted with double fluorescent, can be extensive
It prepares.
Claims (5)
1. a kind of preparation method of carbon quantum dot, it is characterised in that include the following steps：With 90-100 parts of a concentration of 1.5mol/L
Nitric acid flow back 15-25 part wood activated charcoals, reaction temperature be 105-115 DEG C, flow back 14-16h will react after reaction
Gains cooled to room temperature, uses Na2CO3It neutralizes, 20-25min is centrifuged under the conditions of 12000r/min, repeatedly 4-6 times, directly
To acquisition yellowish-brown clear liquid, then use molecular cut off molten to get fluorescent carbon quantum dot for the bag filter of 3000Da dialysis 4-5d
Liquid；Each raw material is parts by weight.
2. preparation method according to claim 1, it is characterised in that：Reaction temperature is 110 DEG C.
3. preparation method according to claim 1, it is characterised in that：Flow back 15h.
4. preparation method according to claim 1, it is characterised in that：22min is centrifuged under the conditions of 12000r/min.
5. preparation method according to claim 1, it is characterised in that：Use molecular cut off saturating for the bag filter of 3000Da
Analyse 4.5d.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810221772.6A CN108373917A (en) | 2018-03-18 | 2018-03-18 | A kind of preparation method of carbon quantum dot |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810221772.6A CN108373917A (en) | 2018-03-18 | 2018-03-18 | A kind of preparation method of carbon quantum dot |
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| CN108373917A true CN108373917A (en) | 2018-08-07 |
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| CN201810221772.6A Withdrawn CN108373917A (en) | 2018-03-18 | 2018-03-18 | A kind of preparation method of carbon quantum dot |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109280401A (en) * | 2018-11-12 | 2019-01-29 | 宁夏交通建设股份有限公司 | Environmental-friendly fluorescent color pitch and preparation method thereof |
| CN110550617A (en) * | 2019-10-25 | 2019-12-10 | 广州工程技术职业学院 | Preparation method of carbon quantum dots |
| CN113896185A (en) * | 2021-10-22 | 2022-01-07 | 河北民族师范学院 | Preparation method and application of apricot shell-based nitrogen-doped graphene quantum dots |
-
2018
- 2018-03-18 CN CN201810221772.6A patent/CN108373917A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109280401A (en) * | 2018-11-12 | 2019-01-29 | 宁夏交通建设股份有限公司 | Environmental-friendly fluorescent color pitch and preparation method thereof |
| CN110550617A (en) * | 2019-10-25 | 2019-12-10 | 广州工程技术职业学院 | Preparation method of carbon quantum dots |
| CN113896185A (en) * | 2021-10-22 | 2022-01-07 | 河北民族师范学院 | Preparation method and application of apricot shell-based nitrogen-doped graphene quantum dots |
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Application publication date: 20180807 |