CN114854394B - Preparation of fluorescent carbon dot nanocomposite and application of fluorescent carbon dot nanocomposite in latent fingerprint display - Google Patents
Preparation of fluorescent carbon dot nanocomposite and application of fluorescent carbon dot nanocomposite in latent fingerprint display Download PDFInfo
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- CN114854394B CN114854394B CN202210575687.6A CN202210575687A CN114854394B CN 114854394 B CN114854394 B CN 114854394B CN 202210575687 A CN202210575687 A CN 202210575687A CN 114854394 B CN114854394 B CN 114854394B
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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
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
- C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
-
- 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
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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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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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention discloses a preparation method of fluorescent carbon dot nanocomposite, which is prepared by preparing fluorescent carbon quantum dots dispersed in a solution from natural pollen by a solvothermal method, fixing the fluorescent carbon quantum dots on montmorillonite powder, zeolite powder or attapulgite powder by an electrostatic adsorption method, and drying the fluorescent carbon quantum dots. The fluorescent carbon dot nanocomposite powder is taken by a hairbrush to brush and display latent fingerprints on different objects, clear fingerprint details can be observed under ultraviolet light, and the fluorescent carbon dot nanocomposite powder is suitable for fingerprint identification. The fluorescent carbon dot nanocomposite provided by the invention is mainly prepared from natural materials, has the advantages of simple preparation process, low manufacturing cost, convenient operation, environmental protection, no toxicity, small injury to operators, good latent fingerprint display effect on different objects, suitability for industrial production and conventional fingerprint display work, and great promotion effect on the development of fingerprint display technology and great practical application value.
Description
Technical Field
The invention belongs to the technical field of trace inspection, and relates to preparation of a fluorescent carbon dot nanocomposite and application thereof in latent fingerprint display.
Background
Fingerprints are unique features of everyone, hardly change in life of the person, and are often used as personal 'identity cards' and 'information bases' to provide valuable evidence for criminal cases, and are known as 'evidence king'. The fingerprints are classified into three types, namely obvious fingerprints and molded stable fingerprints, which can be directly seen by naked eyes, and the third type of latent fingerprints are invisible fingerprints formed by transferring natural secretion (such as sweat) of a body. When a finger touches an object, even if the hand is thoroughly wiped dry, the latent fingerprint may remain in contact, especially with smooth surface objects such as metal, glass, ceramic and painted surfaces. Latent fingerprints are the most common type of fingerprints on crime scenes, although the fingerprints are invisible to naked eyes, the latent fingerprints can be displayed through a professional physicochemical method, so that the physicochemical treatment of the latent fingerprints is crucial for accurate detection and identification of the latent fingerprints.
Through century development, fingerprint development technology and method are endless and new. A series of different kinds of detection methods are currently developed according to the difference of the visualization substrates. The traditional fingerprint display method comprises a chemical dyeing method, a fingerprint powder method, a small particle suspension method, a 502 glue fumigation display method and the like, but the methods still have the defects of low sensitivity, high cost, high toxicity and the like, so that the potential fingerprint on the crime scene is difficult to identify and extract; in recent years, the forensic science community gradually rises the light-emitting detection technology of noble metal nanoclusters, semiconductor quantum dots, rare earth up-conversion nanomaterials and the like, and the defects of high cost, complex process, high toxicity and the like exist, so that the further application of the nano light-emitting materials in the field of potential fingerprint display is limited.
In recent years, carbon dots have attracted extensive attention and research by a large number of researchers with their numerous advantages and potential applications. As a novel luminescent material, carbon is the main element of carbon dots, and the toxicity to organisms and the harm to the environment are almost negligible. The carbon dots have strong luminescence property, good light stability, simple synthesis method, abundant and cheap raw materials, and are expected to further improve the development effect of the latent fingerprints. Therefore, the development of the application of the fluorescent carbon dot-based composite nano material in the aspect of latent fingerprint appearance is very important.
Although pollen is small, the yield is quite remarkable, for example, the Zhejiang navicular forest institute has investigated pollen yield in Zhoushan region, and it is counted that more than 3000 tons of black pine pollen can be produced in the region every year, so that pollen resources are quite abundant. In addition, the natural conditions of China are complex, the topography is various, the plant species are various, the plant species of China are known to be more than 3.5 ten thousand, and the number of the angiosperms with flowers is nearly 3 ten thousand. In recent years, the pollen industry in China rapidly develops, and only the pollen pini variety can achieve the yield of nearly kilotons each year.
Disclosure of Invention
In order to solve the problems in the prior latent fingerprint display technology, the invention aims to provide a preparation method of a fluorescent carbon dot nanocomposite with simple manufacture and low cost;
it is another object of the present invention to provide the use of the fluorescent carbon dot nanocomposite in latent fingerprint development.
The carbon dots have the equivalent luminescence characteristics of the traditional quantum dot material and the fluorescent dye material, and if the carbon dots are fixed in a carrier with strong electrostatic adsorption capacity, fluorescent carbon dot nanocomposite powder is prepared, so that the traditional fingerprint powder can be replaced, the fingerprint development effect is greatly improved, the injury to operators is reduced, and the field use advantage of a powder development method is maintained. Based on the above consideration, the invention provides a preparation method of a fluorescent carbon dot nanocomposite and application of the fluorescent carbon dot nanocomposite in latent fingerprint development. The latent fingerprint developing powder has the characteristics of low cost, easily available raw materials, simple procedure, convenient use, no toxicity, no harm, obvious effect and the like, does not influence the subsequent extraction of DNA in fingerprint residues, can ensure the dual value of fingerprint evidence, and has excellent application value in the technical field of latent fingerprint developing.
The invention adopts the following detailed technical scheme:
1. preparation of fluorescent carbon dot nanocomposite
The preparation method of the fluorescent carbon dot nanocomposite comprises the following steps:
(1) Ultrasonic washing natural pollen, filtering to remove impurities mixed in the collecting process (which is helpful for preparing fluorescent carbon dots with smaller particles and more uniform dispersion), vacuum drying, taking dried purified pollen as a carbon source, taking ethanol as a dispersing agent, adding sulfuric acid, uniformly dispersing pollen and sulfuric acid in an ethanol system by adopting an ultrasonic and/or vibration and/or magnetic stirring mode, heating uniformly dispersed mixed liquid at 100-200 ℃ for 10-20 h, filtering the cooled liquid to remove unreacted larger particle impurities after heating, taking supernatant after centrifugal treatment for ultrasonic treatment, and finally dialyzing for 28-32 h by using a dialysis bag to obtain the fluorescent carbon dot solution.
Wherein the mass ratio of the natural pollen to the sulfuric acid to the ethanol is (1-10): 1: (10-100); the natural pollen is at least one selected from rape pollen, lotus pollen, tea pollen, pollen Pini and Galla chinensis pollen. Pollen is rich in various amino acids, proteins, vitamins and bioactive substances, and is a good carbon source material for preparing carbon dots. Pollen is used as a carbon source, a complex pretreatment procedure is not needed, and the pollen is directly used as the carbon source, so that the manufacturing cost is greatly reduced.
(2) And (3) fully and uniformly mixing the fluorescent carbon dot solution with montmorillonite powder, zeolite powder or attapulgite powder by adopting an ultrasonic and/or vibration and/or magnetic stirring mode, and drying at 10-100 ℃ to obtain the fluorescent carbon dot nanocomposite.
Wherein the montmorillonite powder is at least one selected from natural montmorillonite, sodium-based montmorillonite, calcium-based montmorillonite and lithium-based montmorillonite; the zeolite powder is selected from one of natural zeolite powder and artificial zeolite powder, the artificial zeolite has stronger adsorption performance than natural zeolite and better ion exchange performance, and the artificial zeolite powder is preferred.
The montmorillonite, zeolite and attapulgite used in the method are all novel inorganic nano materials produced by industry, and the cost of exploitation and manufacture is low because of rich mineral deposits, so the cost of the finished product is several times lower than that of the existing nano materials, and the method is the cheapest of the nano materials in the current market. Montmorillonite, zeolite and attapulgite all have ion exchange property and strong adsorptivity, and are good substrate materials for carbon point carriers. The volume mass ratio of the fluorescent carbon dot solution to montmorillonite powder, zeolite powder or attapulgite powder is 1-20 mL/1 g in terms of 6 mL.
The fluorescent carbon quantum dots dispersed in the solution are prepared from natural materials by a solvothermal method, are fixed in montmorillonite powder, zeolite powder and attapulgite powder by an electrostatic adsorption method, and are dried to obtain the fluorescent carbon dot nanocomposite. Pollen is used as a carbon source for synthesizing fluorescent carbon dots, and montmorillonite powder, zeolite powder and attapulgite powder are used as carriers of the fluorescent carbon dots, so that the fluorescent carbon dots are fixed in solid substances. After the carbon dots are fixed in the three materials, the materials which do not emit light under the purple light lamp appear bright green, which is consistent with the color under the purple light lamp when the carbon dots are dispersed in the solution.
The fluorescent carbon dot nanocomposite prepared by the invention is used for detecting latent fingerprints. The detection of the fluorescent carbon dot nanocomposite on the latent fingerprints comprises the following steps:
(1) Grinding the fluorescent carbon dot nanocomposite into powder by using a mortar, dipping the powder by using a common fingerprint brush, flicking the powder on the surface of an object where the latent fingerprints are positioned by using fingers, gently sweeping the powder, continuing to gently sweep the powder along the fingerprint lines after the fingerprint lines appear, and gently sweeping the unbound redundant powder after the fingerprints are completely developed to obtain macroscopic fingerprints; the object comprises glass, aluminum sheet, stainless steel, plastic or cardboard.
(2) And irradiating the surface of the object where the latent fingerprints are positioned by using an ultraviolet light source with the wavelength of 250-400 nm, and shooting to obtain the latent fingerprint display image with high resolution. The fluorescent carbon dot nanocomposite powder is used for brushing sweat latent fingerprints and grease fingerprints on different objects, clear fingerprint details including third-level characteristics of fingerprints such as sweat pores can be observed under ultraviolet light, and the fluorescent carbon dot nanocomposite powder is suitable for fingerprint identification.
Compared with the prior art, the invention has the advantages and effects that:
the fluorescent carbon dot nanocomposite latent fingerprint developing powder has the advantages of easily available raw materials, simple preparation process, low production cost, convenient use and operation and the like, has small biotoxicity, good stability, quick developing and wide application range, is matched with the existing fingerprint developing tool, has two most outstanding advantages, and can achieve the effect of developing the third-level characteristic of the fingerprint, along with high latent fingerprint developing precision; secondly, DNA in a subsequent fingerprint sample is not affected, fingerprint comparison and DNA individual recognition technology can be combined and applied in actual cases, and the method has positive guiding significance for evidence collection on crime sites.
The fluorescent carbon dot nanocomposite not only has a great pushing effect on the development of fingerprint development technology, but also has great practical application value.
Drawings
FIG. 1 is an electron microscope image of fluorescent carbon dots prepared in example 1 of the present invention;
FIG. 2 is an electron microscope image of the montmorillonite carbon dot composite material prepared in example 1 of the present invention;
FIG. 3 is an electron microscope image of the zeolite carbon dot composite material prepared in example 2 of the present invention;
FIG. 4 is an electron microscope image of the attapulgite carbon dot composite material prepared in example 3 of the present invention;
FIG. 5 is a graph showing fluorescence emission spectra of fluorescent carbon dots prepared in example 1 of the present invention at different wavelengths;
FIG. 6 is a graph showing fluorescence emission spectra of montmorillonite carbon dot composite materials prepared in example 1 of the present invention at different wavelengths;
FIG. 7 is a graph showing fluorescence emission spectra of the zeolite carbon dot composite material prepared in example 2 of the present invention at different wavelengths;
FIG. 8 is a graph showing fluorescence emission spectra of carbon dots of attapulgite prepared in example 3 of the present invention at different wavelengths;
FIG. 9 is a latent fingerprint image of fluorescent carbon dot nanocomposite powder obtained in example 1 of the present invention applied to glass;
FIG. 10 is a latent fingerprint image of fluorescent carbon dot nanocomposite powder according to example 1 of the present invention applied to an aluminum sheet;
FIG. 11 is a latent fingerprint image of fluorescent carbon dot nanocomposite powder according to example 1 of the present invention applied to stainless steel;
FIG. 12 is a latent fingerprint image of fluorescent carbon dot nanocomposite powder according to example 1 of the present invention applied to plastics;
FIG. 13 is a latent fingerprint image of a paper jam with the fluorescent carbon dot nanocomposite powder according to example 1 of the present invention;
FIG. 14 is a latent fingerprint image of a fluorescent carbon dot nanocomposite powder according to example 2 of the present invention for plastics;
FIG. 15 is a latent fingerprint image of the fluorescent carbon dot nanocomposite powder according to example 2 of the present invention applied to stainless steel;
FIG. 16 is a latent fingerprint image of the fluorescent carbon dot nanocomposite powder according to example 3 of the present invention applied to stainless steel;
FIG. 17 is a STR typing result after DNA extraction of male latent fingerprints without any composite visualization;
FIG. 18 is a STR typing result after DNA extraction of female latent fingerprints without any composite visualization;
FIG. 19 is a STR typing result of the fluorescent carbon dot nanocomposite powder prepared in example 1 of the present invention after DNA extraction for revealing male latent fingerprints;
FIG. 20 is a STR typing result of the fluorescent carbon dot nanocomposite powder prepared in example 2 of the present invention after DNA extraction after developing latent fingerprints;
FIG. 21 shows STR typing results of fluorescent carbon dot nanocomposite powder prepared in example 3 of the present invention after DNA extraction after developing latent fingerprints.
(note: in fig. 9 to 16, shooting under sunlight, shooting under a purple light lamp, and shooting under enlarged details of the purple light lamp are sequentially from left to right).
Detailed Description
The preparation method and application of the fluorescent carbon dot nanocomposite of the present invention are described in detail below by way of specific embodiments.
Example 1 preparation of fluorescent carbon dot nanocomposite
(1) Ultrasonic washing natural pollen, filtering to remove impurities mixed in the collecting process, vacuum drying, adding 0.6g dried pollen Pini into 50ml ethanol, adding 0.2ml sulfuric acid, stirring by magnetic force, dispersing, transferring the uniformly dispersed mixed liquid into a high temperature reaction container, and heating in an oven at 180deg.C for 20 hr. And after heating and cooling, filtering by using a filter membrane, centrifuging, taking supernatant, performing ultrasonic treatment for 10 minutes, and dialyzing for 30 hours by using a dialysis bag to obtain a fluorescent carbon dot solution.
The scanning electron microscope of the carbon dots is shown in figure 1, the prepared carbon dots are spherical, uniform in size, good in dispersibility and 3.21nm in average particle size. The fluorescence emission diagram of the carbon dot is shown in fig. 5, the fluorescence emission of the carbon dot shows a strong single emission peak at different excitation wavelengths, and the emission peak does not significantly move with the increase of the excitation wavelength, which indicates that photoluminescence of the carbon dot has no excitation wavelength dependent property. Second, when the excitation wavelength is 390nm, the maximum emission peak occurs, which has an emission wavelength of 526 nm, exhibiting intense green fluorescence.
(2) 7ml of fluorescent carbon dot solution is taken and mixed with 1g of sodium montmorillonite powder, and after the mixture is fully mixed by adopting a magnetic stirring mode, the mixed solution is placed in an oven for drying at 50 ℃. Grinding the obtained dry solid into powder by using a mortar, and filling the powder into a brown glass bottle for later use.
The scanning electron microscope image of the montmorillonite loaded with carbon points is shown in figure 2, and the carbon point montmorillonite composite material maintains the original layered structure of the montmorillonite. The fluorescence emission diagram of the montmorillonite-loaded carbon dots is shown in fig. 6, the carbon dot composite material of the montmorillonite maintains the photoluminescence characteristics when the carbon dots are dispersed in a solution state, the emission wavelength is kept around 530nm, and the maximum emission peak appears when the excitation wavelength is 450 nm.
Example 2 preparation of fluorescent carbon dot nanocomposite
(1) As in example 1;
(2) Mixing 20ml of fluorescent carbon dot solution with 3g of artificial zeolite powder, fully mixing the mixture by adopting a magnetic stirring mode, and then placing the mixed solution in an oven for drying at 50 ℃. Grinding the obtained dry solid into powder by using a mortar, and filling the powder into a brown glass bottle for later use.
The scanning electron microscope image of the carbon dots loaded on the zeolite is shown in fig. 3, carbon dot particles adsorbed on the surface of the zeolite can be observed on the surface of the zeolite, and the overall structure of the zeolite is not changed obviously. The fluorescence emission diagram of the zeolite-loaded carbon dots is shown in fig. 7, the photoluminescence characteristics of the zeolite-carbon dot composite material are maintained when carbon dots are dispersed in a solution state, the emission wavelength is maintained at about 535nm, no obvious movement occurs due to the change of the excitation wavelength, and the emission peak is maximum when the excitation wavelength is 450 nm.
Example 3 preparation of fluorescent carbon dot nanocomposite
(1) As in example 1;
(2) Mixing 20ml of fluorescent carbon dot solution with 1g of attapulgite powder, fully mixing the mixture by adopting a magnetic stirring mode, and then placing the mixed solution in an oven for drying at 50 ℃. Grinding the obtained dry solid into powder by using a mortar, and filling the powder into a brown glass bottle for later use.
The scanning electron microscope graph of the attapulgite loaded carbon points is shown in fig. 4, and the attapulgite structure is not changed due to the loaded carbon points, so that the original structural appearance is maintained. The attapulgite-loaded carbon dot fluorescence emission graph is shown as 8, the attapulgite carbon dot composite material keeps the photoluminescence characteristics when carbon dots are dispersed in a solution state, the emission wavelength is kept at about 535nm, the emission is not obviously moved due to the change of the excitation wavelength, the emission is bright green, and the emission peak is maximum when the excitation wavelength is 450 nm.
Example 4 visualization of fluorescent carbon dot nanocomposite on latent fingerprints on glass
The fluorescent carbon dot nanocomposite powder prepared in example 1 was dipped with a normal fingerprint brush, and was flicked with a finger onto the surface of the glass where the latent fingerprint was located, and the powder was gently brushed with a brush to be adsorbed onto the fingerprint lines, and after the fingerprint developed completely, the excessive unbound powder was brushed off, and the area where the latent fingerprint was located was irradiated with a sunlight source and a 365nm ultraviolet source, respectively, and a clear latent fingerprint developed image on the glass was photographed, as shown in fig. 9. The fingerprint image with clear lines can be obtained under sunlight and ultraviolet light, the fingerprint image is bright green under ultraviolet light, and the details of fingerprint lines are clear.
Example 5 development of fluorescent carbon dot nanocomposite to latent fingerprints on aluminum sheets
The fluorescent carbon dot nanocomposite powder prepared in example 1 was brushed to develop latent fingerprints on an aluminum sheet according to the latent fingerprint developing effect test method of example 4, and the developing results are shown in fig. 10. The fingerprint image with clear lines can be obtained under sunlight and ultraviolet light, and the fingerprint image is bright green under ultraviolet light, so that sweat pore characteristics are clear and visible.
Example 6 visualization of fluorescent carbon dot nanocomposite on latent fingerprints on stainless steel
The fluorescent carbon dot nanocomposite development powder prepared in example 1 was used to brush latent fingerprints on stainless steel according to the latent fingerprint development effect test method of example 4, and the development results are shown in fig. 11. The fingerprint image with clear lines can be obtained under sunlight and ultraviolet light, and the fingerprint image is bright green under ultraviolet light, so that the fingerprint lines are clear.
Example 7 development of fluorescent carbon dot nanocomposite to latent fingerprints on plastics
The fluorescent carbon dot nanocomposite development powder prepared in example 1 was used to brush latent fingerprints on plastics according to the latent fingerprint development effect test method of example 4, and the development results are shown in fig. 12. The fingerprint image with clear lines can be obtained under sunlight and ultraviolet light, and the fingerprint image is bright green under ultraviolet light, so that the fingerprint lines are clear.
Example 8 fluorescent carbon dot nanocomposite visualizes latent fingerprints on cardboard
The fluorescent carbon dot nanocomposite development powder prepared in example 1 was used to brush latent fingerprints on cardboard according to the latent fingerprint development effect test method of example 4, and the development results are shown in fig. 13. The fingerprint image with clear lines can be obtained under sunlight and ultraviolet light, and the fingerprint image is bright green under ultraviolet light.
Example 9 visualization of fluorescent carbon dot nanocomposite on latent fingerprints on plastics
And detecting the latent fingerprint appearance effect of the fluorescent carbon dot nanocomposite prepared in the example 2 on plastics. The fluorescent carbon dot nanocomposite powder prepared in example 2 was used to brush latent fingerprints on plastics according to the latent fingerprint development effect test method of example 4, and the development results are shown in fig. 14. The fingerprint image with clear lines can be obtained under sunlight and ultraviolet light, and the fingerprint image is bright green under ultraviolet light, so that the scar features are clear and visible.
Example 10 development of fluorescent carbon dot nanocomposite to latent fingerprints on stainless steel
And detecting the latent fingerprint appearance effect of the fluorescent carbon dot nanocomposite prepared in the example 2 on stainless steel. The fluorescent carbon dot nanocomposite powder prepared in example 2 was used to brush latent fingerprints on stainless steel according to the latent fingerprint development effect test method of example 4, and the development results are shown in fig. 15. The fingerprint image with clear lines can be obtained under sunlight and ultraviolet light, and the fingerprint image is bright green under ultraviolet light, so that sweat pore characteristics are clear and visible.
EXAMPLE 11 development of fluorescent carbon dot nanocomposite Material against latent fingerprints on stainless Steel
And detecting the latent fingerprint appearance effect of the fluorescent carbon dot nanocomposite prepared in the example 3 on stainless steel. The fluorescent carbon dot nanocomposite powder prepared in example 3 was used to brush latent fingerprints on stainless steel according to the latent fingerprint development effect test method of example 4, and the development results are shown in fig. 16. The fingerprint image with clear lines can be obtained under sunlight and ultraviolet light, and the fingerprint image is bright green under ultraviolet light, so that sweat pore characteristics are clear and visible.
As shown in fig. 9-16, the fingerprint image is clearly visible and fingerprint minutiae information is observable. Therefore, the fluorescent carbon dot nanocomposite can show excellent latent fingerprint imaging effect in latent fingerprint display on different objects. As shown in fig. 19 to 21, it is understood from the comparison analysis of fig. 17 and 18 that the extraction of DNA in the post-extraction fingerprint residues is not affected after the fingerprint is developed using the fluorescent carbon dot nanocomposite powder prepared according to the present invention.
Claims (9)
1. A method for preparing fluorescent carbon dot nanocomposite, comprising the following steps:
(1) Ultrasonically washing, filtering and vacuum drying natural pollen, taking dried purified pollen as a carbon source, taking ethanol as a dispersing agent, adding sulfuric acid, uniformly dispersing, heating uniformly dispersed mixed liquid at 180 ℃ for 10-20 hours, performing suction filtration on the cooled liquid after heating, performing centrifugal treatment, taking supernatant fluid for ultrasonic treatment, and finally dialyzing for 28-32 hours by using a dialysis bag to obtain a fluorescent carbon dot solution; the fluorescent carbon dots are spherical and present strong green fluorescence; the mass ratio of the natural pollen to the sulfuric acid to the ethanol is (1-10): 1: (10-100);
(2) And (3) fully and uniformly mixing the fluorescent carbon dot solution with montmorillonite powder, zeolite powder or attapulgite powder, and drying at 10-100 ℃ to obtain the fluorescent carbon dot nanocomposite.
2. The method for preparing the fluorescent carbon dot nanocomposite according to claim 1, wherein: in the step (1), the natural pollen is at least one selected from rape pollen, lotus pollen, tea pollen, pine pollen and gallnut pollen.
3. The method for preparing the fluorescent carbon dot nanocomposite according to claim 1, wherein: in the step (2), the montmorillonite powder is at least one selected from natural montmorillonite, sodium-based montmorillonite, calcium-based montmorillonite and lithium-based montmorillonite.
4. The method for preparing the fluorescent carbon dot nanocomposite according to claim 1, wherein: in the step (2), the zeolite powder is selected from one of natural zeolite powder and artificial zeolite powder.
5. The method for preparing the fluorescent carbon dot nanocomposite according to claim 1, wherein: in the step (2), the volume mass ratio of the fluorescent carbon dot solution to the montmorillonite powder, the zeolite powder or the attapulgite powder is 1-20 mL/1 g in terms of 6 mL.
6. The use of the fluorescent carbon dot nanocomposite prepared by the method of claim 1 in the development of latent fingerprints.
7. The use of the fluorescent carbon dot nanocomposite in latent fingerprint development according to claim 6, wherein: the detection of the fluorescent carbon dot nanocomposite on the latent fingerprints comprises the following steps:
(1) Grinding the fluorescent carbon dot nanocomposite into powder by using a mortar, dipping the powder by using a brush, lightly flicking the powder on the surface of an object where the latent fingerprints are located by using fingers, and lightly sweeping the surface of the object where the latent fingerprints are located by using the brush to obtain macroscopic fingerprints;
(2) And irradiating the surface of the object where the latent fingerprint is positioned by using an ultraviolet light source, and shooting to obtain a latent fingerprint display image with high resolution.
8. The use of the fluorescent carbon dot nanocomposite material of claim 7 in latent fingerprint development, wherein: the wavelength range of the ultraviolet light source is 250-400 nm.
9. The use of the fluorescent carbon dot nanocomposite material of claim 7 in latent fingerprint development, wherein: the object comprises glass, aluminum sheet, stainless steel, plastic or cardboard.
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