CN105860969B - A kind of method for improving carbon quantum dot fluorescence property - Google Patents
A kind of method for improving carbon quantum dot fluorescence property Download PDFInfo
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- CN105860969B CN105860969B CN201610318443.4A CN201610318443A CN105860969B CN 105860969 B CN105860969 B CN 105860969B CN 201610318443 A CN201610318443 A CN 201610318443A CN 105860969 B CN105860969 B CN 105860969B
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- 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
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Abstract
The present invention relates to propose a kind of method for improving carbon quantum dot fluorescence property.Loprazolam and ethylene glycol mixed solution are measured, and weighs the aluminum oxide that quality is 0.1 0.5 times of Loprazolam quality, is put into fluorescent carbon quantum dot solution, stirs；Obtained solution is centrifuged under 10,000 16000 turns of rotating speed；Supernatant after centrifugation is put into bag filter and dialysed, and the fluorescent quantum dot solution that a water collects the solution after purification was changed every 48 hours；Obtain strengthening carbon quantum dot fluorescent solutions.By using the fluorescence intensity of the carbon quantum dot solution after being measured common carbon quantum dot with XRF and be esterified, its fluorescence intensity highest can lift 40%.The inventive method is simple and easy, easy to operate.
Description
Technical field
The invention belongs to fluorescent carbon field of material technology, the method for particularly proposing to improve carbon quantum dot fluorescence property.
Background technology
Carbon quantum dot causes the great interest of people as the novel fluorescence carbon nano-particles occurred in recent years.Fluorescent carbon
Quantum dot has a series of excellent features, such as the water solubility that particle diameter is small, excellent, resistance to photobleaching, hypotoxicity, good biology
Compatibility etc..Increasing researcher applies it to bio-imaging, metal ion detection and cell marking etc..
But application of the carbon quantum dot in terms of fluoroscopic examination just starts to walk, the sensitivity of response and anti-interference energy are identified
Power is not high, causes its application to diminish.Therefore it is quick to prepare offer, it is sensitive, the fluorescence signal being accurately more easily detected
Carbon quantum dot, its application is expanded, be an important directions of carbon quantum dot research.And relevant carbon quantum dot synthesis at present
Method mainly has laser ablation, chemical oxidization method, microwave heating method, supported synthesis etc., the carbon quantum of these methods synthesis
Point fluorescence intensity is general all weaker, it is necessary to be further passivated using surface passivator, and cost is high, complex operation.Cause
This is concentrated on the research emphasis of the fluorescence property of carbon quantum dot finds faster, easy preparation method and how effectively to carry
The aspect of fluorescent characteristic two of high-carbon quantum dot.Because carbon quantum dot surface has substantial amounts of carboxyl and hydroxyl.When carbon quantum dot passes through
When crossing ultraviolet light or x-ray bombardment, electronics is rear to return to ground state from excitation state again by ground state to excitation state, launches fluorescence, due to
Carboxyl has very strong electron-withdrawing power, and electronics needs more energy from ground state to excitation state, therefore more containing carboxyl
The fluorescence of carbon quantum dot transmitting is weaker, and hydroxyl loses electronic capability, causes its fluorescence stronger.
The content of the invention
The present invention is utilized on carbon quantum dot surface carboxyl groups by changing the carboxyl on carbon quantum dot surface with glycol reaction
The fluorescence property of carbon quantum dot is improved for hydroxyl.The method of the present invention is as shown in Figure 1：Using Loprazolam, aluminum oxide as catalysis
Agent, esterification is carried out using the carboxyl on ethylene glycol and carbon quantum dot, carbon quantum dot surface carboxyl groups are converted into hydroxyl, so as to
Lift the fluorescence property of carbon quantum dot.
Concrete technical scheme is as follows：
A kind of method for improving carbon quantum dot fluorescence property, step are as follows：
(1) Loprazolam and ethylene glycol mixed solution are measured, and weighs the oxygen that quality is 0.1-0.5 times of Loprazolam quality
Change aluminium, be put into fluorescent carbon quantum dot solution, stir；
(2) solution that step 1) obtains is centrifuged under the rotating speed that 10000-16000 turns；
(3) supernatant after centrifugation is put into bag filter and dialysed, and after 4-8 hours change a water collection purification
Solution fluorescent quantum dot solution；It is improved carbon quantum dot fluorescent solutions.
Preferred steps 1) in the volume ratio of Loprazolam and ethylene glycol be 1:10-1.
Preferred steps 1) in the ratio of ethylene glycol and fluorescent carbon quantum dot solution be 1:10-3
Preferred steps 1) in stirring 10-24h；
Preferred steps 2) in be put into fluorescent carbon quantum dot solution and stir 10-24h.
Preferred steps 2) in centrifuge time 10-15min.
Preferred steps 3) in dialyse in bag filter 24-48h.
Common carbon quantum dot and the fluorescence intensity of the carbon quantum dot solution after esterification are measured by using with XRF,
Its fluorescence intensity highest can lift 40%.The inventive method is simple and easy, easy to operate.
Brief description of the drawings
Fig. 1 is the schematic diagram that the present invention improves carbon quantum dot fluorescent method；
Carbon quantum dot is glimmering under different excitation wavelengths after Fig. 2 is the common carbon quantum dot prepared in example 1 and reacted
Light spectrogram, the carbon quantum dot fluorescence property after being as can be seen from the figure esterified improve 40%；
Carbon quantum dot is glimmering under different excitation wavelengths after Fig. 3 is the common carbon quantum dot prepared in example 2 and reacted
Light spectrogram, the carbon quantum dot fluorescence property after being as can be seen from the figure esterified improve 26%；
Carbon quantum dot is glimmering under different excitation wavelengths after Fig. 4 is the common carbon quantum dot prepared in example 3 and reacted
Light spectrogram, the carbon quantum dot fluorescence property after being as can be seen from the figure esterified improve 24%；
Carbon quantum dot is glimmering under different excitation wavelengths after Fig. 5 is the common carbon quantum dot prepared in example 4 and reacted
Light spectrogram, the carbon quantum dot fluorescence property after being as can be seen from the figure esterified improve 13%.
Specific embodiment
In order that advantages of the present invention, technical scheme and purpose are more clearly understood that, the present invention is entered to advance with reference to example
The explanation of one step.Embodiments of the invention are given below, are the further explanations to the present invention, rather than limit the model of the present invention
Enclose.
Example 1
(1) Loprazolam (Loprazolam density is 1.4812g/ml) that volume ratio is 1ml and 10ml ethylene glycol are measured,
And 200mg aluminum oxide is weighed, and put it into the 30ml carbon quantum dot solution prepared by hydro-thermal method, stir 24h；
(2) above-mentioned solution is positioned in centrifuge tube, 15min is centrifuged under 16000 turns of rotating speed,
(3) supernatant after centrifugation is put into bag filter the 48h that dialyses, and a water was changed every 4 hours；Collect above-mentioned
The fluorescent quantum dot solution of solution after purification；
(4) fluorescence by using the carbon quantum dot solution after being measured common carbon quantum dot with XRF and be esterified is strong
Degree, as shown in Fig. 2 the carbon quantum dot solution fluorescence after being as can be seen from the figure esterified significantly improves, improve nearly 40%.
Example 2
(1) Loprazolam that volume ratio is 1ml and 5ml ethylene glycol are measured, and weighs 148mg aluminum oxide, and by its
It is put into the 25ml carbon quantum dot solution prepared by hydro-thermal method, stirs 18h；
(2) above-mentioned solution is positioned in centrifuge tube, 10min is centrifuged under 10000 turns of rotating speed,
(3) supernatant after centrifugation is put into bag filter the 24h that dialyses, and a water was changed every 8 hours；Collect above-mentioned
The fluorescent carbon quantum dot solution of solution after purification；
(4) fluorescence by using the carbon quantum dot solution after being measured common carbon quantum dot with XRF and be esterified is strong
Degree, as shown in figure 3, the carbon quantum dot solution fluorescence after being as can be seen from the figure esterified significantly improves, improve nearly 26%.
Example 3
(1) measure volume ratio and be 5ml Loprazolam and 5ml ethylene glycol, and weigh 500mg aluminum oxide, and put
Enter in the 50ml carbon quantum dot solution prepared by hydro-thermal method, stir 10h；
(2) above-mentioned solution is positioned in centrifuge tube, 15min is centrifuged under 13000 turns of rotating speed,
(3) supernatant after centrifugation is put into bag filter the 36h that dialyses, and a water was changed every 6 hours；Collect above-mentioned
The fluorescent carbon quantum dot solution of solution after purification；
(4) fluorescence by using the carbon quantum dot solution after being measured common carbon quantum dot with XRF and be esterified is strong
Degree, as shown in figure 4, the carbon quantum dot solution fluorescence after being as can be seen from the figure esterified significantly improves, improve nearly 24%.
Example 4
(1) Loprazolam that volume ratio is 5ml and 5ml ethylene glycol are measured, and weighs 750mg aluminum oxide, and by its
It is put into the 40ml carbon quantum dot solution of hydro-thermal method preparation, stirs 24h；
(2) above-mentioned solution is positioned in centrifuge tube, 13min is centrifuged under 16000 turns of rotating speed,
(3) supernatant after centrifugation is put into bag filter the 48h that dialyses, and a water was changed every 8 hours；Collect above-mentioned
The fluorescent carbon quantum dot solution of solution after purification；
(4) fluorescence by using the carbon quantum dot solution after being measured common carbon quantum dot with XRF and be esterified is strong
Degree, as shown in figure 5, the carbon quantum dot solution fluorescence after being as can be seen from the figure esterified significantly improves, improve nearly 13%.
Claims (6)
- A kind of 1. method for improving carbon quantum dot fluorescence property, it is characterized in that step is as follows：(1) Loprazolam and ethylene glycol mixed solution are measured, and weighs the oxidation that quality is 0.1-0.5 times of Loprazolam quality Aluminium, it is put into fluorescent carbon quantum dot solution, stirs；(2) solution that step 1) obtains is centrifuged under the rotating speed that 10000-16000 turns；(3) supernatant after centrifugation is put into bag filter and dialysed, and it is molten after 4-8 hours change a water collection purification The fluorescent quantum dot solution of liquid；It is improved carbon quantum dot fluorescent solutions.
- 2. the method as described in claim 1, it is characterized in that the volume ratio of Loprazolam and ethylene glycol is 1:10-1.
- 3. the method as described in claim 1, it is characterized in that the volume ratio of ethylene glycol and fluorescent carbon quantum dot solution is 1:10-3.
- 4. the method as described in claim 1,10-24h is stirred it is characterized in that being put into fluorescent carbon quantum dot solution.
- 5. the method as described in claim 1, it is characterized in that centrifuging time 10-15min.
- 6. the method as described in claim 1, it is characterized in that the 24-48h that dialysed in bag filter.
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