CN104382600A - Two-step latent fingerprint manifesting method based on nano-particles - Google Patents
Two-step latent fingerprint manifesting method based on nano-particles Download PDFInfo
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- CN104382600A CN104382600A CN201410680319.3A CN201410680319A CN104382600A CN 104382600 A CN104382600 A CN 104382600A CN 201410680319 A CN201410680319 A CN 201410680319A CN 104382600 A CN104382600 A CN 104382600A
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- 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
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Abstract
The invention relates to a two-step latent fingerprint manifesting method based on nano-particles. The two-step latent fingerprint manifesting method based on nano-particles includes that firstly, combining zinc oxide or aluminum oxide nano-particles with micro substances at the fingerprint surface through a physical or chemical method to realize high-sensitivity fingerprint manifesting; secondly, using organic fluorescent dye coloring agent to adsorb the manifested fingerprint so as to realize the high-contrast fluorescence characteristic manifesting of the fingerprint. The two-step latent fingerprint manifesting method based on nano-particles has advantages of high sensitivity, strong associativity, background reflection interference resistance, multi-waveband fluorescence emitting and the like, and both the manifesting rate and sensitivity are higher than those of a powder manifesting method and a 502 glue fuming method.
Description
Technical field
The invention belongs to public security Forensic Science field, be specifically related to a kind of two step developing latent finger prints methods based on nano-particle.
Background technology
Due to the interaction of sweat mixed with dirt and oils and fats and body surface when fingerprint refers to the finger touch object of people, leave the impression of reflection finger skin papillary ridges on a surface of an.Fingerprint with its special physiological structure and feature architecture, in one of the criminal investigation field material evidence becoming most worthy.One of most reliable method that individual identifies is carried out in fingerprint identification, plays a part very important in solving criminal cases.
Fingerprint technique originates from China, and dactylography is risen in Europe, and as far back as in the middle of the 19th century, scientific circles just start research to fingerprint.1856, omeprazole that proposed the theory of " fingerprint is unchangeable ", and namely fingerprint has invariance.In addition, fingerprint also has uniqueness and heritability, and due to the Finger-print labelling method that everyone has oneself exclusive, therefore, the centuries, fingerprint becomes the important clue that the police accuse of suspect.1892, the method that the Argentinian police utilize fingerprint to contrast cracked criminal case together, became the first case that fingerprint is applied in case is cracked.Enter 20 century 70s, the development of computer technology makes fingerprint technique be applied fast.
Laten fingerprints is most important one in three kinds of fingerprint on site, knows method for distinguishing and has carried out large quantifier elimination, be mainly divided into three major types, i.e. chemical appearance method, physics appearance method and physical chemistry appearance method for laten fingerprints.Physics appearance method mainly comprises powder method and vacuum metal deposition method etc., and the method utilizes the adhesive attraction of perspiration material, by a kind of species adsorbs on fingerprint ridge, makes fingerprint line show color.Physical method is easy and simple to handle, quick, but can cause the destruction of fingerprint, and often can cause damage to the healthy of staff.Chemistry appearance method comprises ninhydrin method, fluorescent material appearance method, DFO method, dye adsorption method and electrochemical polymerization method etc., and the method mainly utilizes the aminoacid etc. contained in chemical substance and fingerprint to react, thus makes fingerprint manifestation out.The injury that this method causes staff compared with Physical is little, but chemical method susceptiveness is weak, and limitation is large.Physico-chemical process mainly comprises many precipitated metals method, silver nitrate method, iodine fumigation and " 502 " glue fumigation etc.
In sum, the authentication method of traditional laten fingerprints exists a lot of not enough, and such as insufficient sensitivity, is subject to the impact etc. of environment.Nanosecond science and technology are a kind of new techniques grown up in recent years, all achieve remarkable achievement in a lot of field, and scientific research personnel is applied in the appearing technique of laten fingerprints, achieve certain technological break-through.
Nano material comparatively macroscopic material has good physicochemical properties, comprises selectivity, magnetic and fluorescence etc., and these character can make nano material and the combination such as inorganic substances, organic substance be retained in criminal scene finger mark, show laten fingerprints.Meanwhile, nano-particle can produce fluorescence after by the light source irradiation such as ultraviolet light, the fluorescence imaging utilizing the nano material of certification mark on finger mark to send and clear reflection fingerprint characteristic.Therefore, studying the application of nano material in latent manifests is the important research direction of fingerprint technique one.
In the practical application of nano material, because the object surface mass at fingerprint place is of a great variety, only utilize the color of nano-particle itself, high brightness, the high-contrast that cannot realize fingerprint manifest; On the other hand, when nano-particle fluorescence manifests fingerprint, only have the nano material of semiconductor property just can excite under the LASER Light Source needing specific band, obtain the fingerprint of fluorescent characteristics.The deficiency of these aspects makes the application of nano-particle in developing latent finger prints be restricted.Therefore, study a kind of new process for show based on nano-particle, there is important using value.
Patent 200910066558.9 proposes a kind of method adopting golden nanometer particle one step to manifest laten fingerprints, the method utilizes the golden nanometer particle of glucose modified or the golden nanometer particle of sucrose modified, interact with residual material in object fingerprint surface within the scope of certain pH, thus manifest laten fingerprints.This process simplify the step of developing latent finger prints, environmental sound, but this method does not solve the problem that the sensitivity of nano-particle in fingerprint manifestation and nano-particle are combined with fingerprint residues material.
Patent 201410059253.6 discloses a kind of method that aobvious laten fingerprints smoked by wax candle flue dust, the method is by the wax candle of burning smoked plating laten fingerprints sample, then imposing external force makes unstable paddy district candle ash come off, and leaves conjugation comparatively Gao Ji district candle ash, can show clear fingerprint.The method is simple and quick, and cost is lower, but fumigation sensitivity is poor, manifests brightness and is also under suspicion.
Patent 201210141370.8 proposes a kind of method utilizing spray to manifest laten fingerprints.There is convenience and good fingerprint manifestation effect, but larger by the impact of contextual factor.
In sum, the method manifesting laten fingerprints in prior art is a lot, and wherein the effect that manifests of nano-particle has advantage, but the fluorescence excitation of associativity and common light sources and multiband fluorescence transmitting need to improve; Fumigation method is easy, fast, but manifests effect and sensitivity is poor.This research adopts a kind of two step fluorescent appear methods based on nano-particle, manifesting effect, manifests all many-sides such as rate and sensitivity and is all obviously better than traditional method.
Summary of the invention
The object of this invention is to provide a kind of developing latent finger prints method of high brightness, high-contrast, and realize the fluorescent emission of common light sources in fingerprint manifestation, and the method that multiband fluorescence is launched.
The present invention proposes a kind of two step developing latent finger prints methods based on nano-particle.First the method utilizes the physicochemical characteristics of nano-particle uniqueness, is combined, realizes highly sensitive fingerprint manifestation by the method for physics or chemistry with the trace substance on fingerprint surface; Secondly, then carry out adsorption treatment with organic fluorescent dye coloured solvent to the fingerprint after manifesting, the high-contrast fluorescent characteristics achieving fingerprint manifests.
A technical scheme of the present invention relates to the preparation method that nano-particle manifests liquid, comprises the following steps:
(1) a certain amount of powder of nanometric particles is put into conical flask;
(2) add a certain amount of polar solvent, then add a certain amount of surfactant or surface-functionalized reagent;
(3) be positioned in magnetic stirring apparatus, under certain reaction temperature and specified rotation number, water-bath refluxes one period of response time;
(4), after reaction terminates, removing supernatant, solubilizer cleaning for several times, finally adds stabilizing agent and makes and manifest liquid.
Preferably, in described step (1), powder of nanometric particles is nano-aluminium oxide or nano zine oxide; Preferred, described step (1) specifically comprises: get 3-5g nano-aluminium oxide and put into conical flask.
Preferably, in described step (2), surfactant or surface-functionalized reagent are N-octyl group trimethoxy silane, and polar solvent is water; Preferred, above-mentioned steps (2) specifically comprises: in conical flask, add 100-200ml distilled water and 0.2-2ml surface-functionalized reagent N-octyl group trimethoxy silane.
Preferably, in described step (3), reaction temperature is 20-60 DEG C, and agitation revolution is 400-800 rev/min, and the response time is 1-2 hour; Preferred, above-mentioned steps (3) specifically comprises: 20-60 DEG C of water-bath reflux 1-2 hour in magnetic stirring apparatus, and setting revolution 400-800 rev/min, makes reactant fully react.
Preferably, in described step (4), described solvent is methanol or water, preferred, and described solvent is distilled water; Described stabilizing agent is methanol or water, preferred, and described stabilizing agent is distilled water; Preferred, above-mentioned steps (4) specifically comprises: use centrifuge, rotating speed is 7000-9000 revolutions per second, removing supernatant, and adding distil water cleans, repeated washing 3 times, and by Impurity removal, what finally add that distilled water is mixed with 100ml manifests liquid.
Further, a technical scheme of the present invention also relates to the preparation of organic fluorochrome stains, comprises the following steps:
(5) get a certain amount of organic fluorescent dye, add in a certain amount of polar solvent, shake up dispersion, make organic fluorescent dye coloring agent.
Preferably, in described step (5), organic fluorescent dye coloring agent is cationic yellow, fluorescence green, rose-red, is preferably cationic yellow; Preferred, described step (5) specifically comprises: get 0.2-0.5g cationic yellow, add in 100ml methanol, make cationic yellow stain.
Further, a technical scheme of the present invention also relates to the technical scheme that two step method manifests laten fingerprints, comprises the following steps:
(6) nano-particle is manifested liquid and shake up into emulsus, the material to be checked being suspected to have impression of the hand is immersed to manifest in liquid and rocks, or emulsus is manifested drop and be suspected to have the material surface to be checked of impression of the hand, after leaving standstill, namely there is fingerprint to show, then wash loose colour off with clear water, natural drying;
(7) draw appropriate organic fluorescent dye coloring agent with suction pipe, be applied to impression of the hand surface, then wash removal floating color with water, observe under long-wave ultra violet lamp, impression of the hand presents high-contrast fluorescent characteristics.
Preferably, in described step (6), nano-particle manifests the preparation method of liquid for shown in step (1)-(4); Preferred, described material to be checked is metal, pottery, glass, plastics etc.Preferred, above-mentioned steps (6) specifically comprises: nano-aluminium oxide is manifested liquid and shakes up into emulsus, the material to be checked being suspected to have impression of the hand is immersed in nitrite ion and constantly rocks, or emulsus is manifested drop be suspected to have the material surface to be checked of impression of the hand, after leaving standstill, namely there is impression of the hand to show, then wash away loose colour with clear water, natural drying.In order to prevent manifesting in liquid put procedure, appearsing as a point generation sedimentation, preferably, liquid will be manifested before use and shake up into emulsus.
Preferably, in described step (7), the preparation method of organic fluorescent dye coloring agent is for shown in step (5); Preferred, above-mentioned steps (7) specifically comprises: draw appropriate cationic yellow stain with suction pipe, be applied to impression of the hand surface, then wash removal floating color with water, observe under long-wave ultra violet lamp, and impression of the hand is in bright yellow green.
Tool of the present invention has the following advantages:
1. easy and simple to handle, cost is lower, nontoxic to staff, is applicable to the application of public security criminal field.
2. by the combination of nano-particle and fingerprint residues thing, and fluorescent color process is carried out in two steps, makes fingerprint manifestation have higher sensitivity and high-contrast fluorescent characteristics.
3. effectively overcome in developing latent finger prints technological difficulties such as bearing the reflective interference of background and range of application restriction.
4. achieve common light sources fluorescence excitation and multiband fluorescence in fingerprint manifestation to launch.
Accompanying drawing explanation
Fig. 1 be adopt embodiment 1 method to latent fingerprint on whiteware experimental material manifest result.
Fig. 2 be adopt embodiment 2 method to latent fingerprint on glass check material manifest result.
Fig. 3 be adopt embodiment 3 method to latent fingerprint on aluminium foil experimental material manifest result.
Fig. 4 be adopt embodiment 4 method to latent fingerprint on green plastic experimental material manifest result.
Fig. 5 be adopt embodiment 5 method to latent fingerprint on red lacquer painting can experimental material manifest result.
Fig. 6 be adopt embodiment 6 method to latent fingerprint on green lacquer painting can experimental material manifest result.
Detailed description of the invention
Embodiment 1:
Nano-particle manifests the preparation method of liquid:
(1) weigh in the balance and get 3g nano-aluminium oxide, put into conical flask;
(2) in conical flask, add the distilled water of 100ml, and then add 0.2ml N-octyl group trimethoxy silane, mix homogeneously;
(3) stir in magnetic stirring apparatus, revolution is 400 revs/min, and 20 DEG C of water-baths reflux 1 hour, fully react;
(4) solution will reacted, removes supernatant, uses distilled water cleaning repeatedly, finally adds stabilizing agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and get 0.2g cationic yellow, add 100ml methanol, make cationic yellow stain.
Process for show:
(6) nano-aluminium oxide that step (4) is obtained is manifested liquid and shake up into emulsus;
(7) the material whiteware to be checked being suspected to have impression of the hand is immersed in liquid constantly to rock, namely have impression of the hand to show;
(8) loose colour is washed off with clear water, natural drying;
(9) draw the obtained cationic yellow stain of appropriate step (5) with suction pipe, be applied to impression of the hand surface, then wash removal floating color with water, observe under long-wave ultra violet lamp, impression of the hand, in bright yellow green, the results are shown in accompanying drawing 1.
Embodiment 2:
(1) weigh in the balance and get 4g nano-aluminium oxide, put into conical flask;
(2) in conical flask, add the distilled water of 150ml, and then add 1ml N-octyl group trimethoxy silane, mix homogeneously;
(3) stir in magnetic stirring apparatus, revolution is 600 revs/min, and 30 DEG C of water-baths reflux 1.5 hours, fully react;
(4) solution will reacted, removes supernatant, uses distilled water cleaning repeatedly, finally adds stabilizing agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and get 0.4g cationic yellow, add 100ml methanol, make cationic yellow stain.
Process for show:
(6) nano-aluminium oxide that step (4) is obtained is manifested liquid and shake up into emulsus;
(7) material glass to be checked being suspected to have impression of the hand is immersed in liquid constantly to rock, namely have impression of the hand to show;
(8) loose colour is washed off with clear water, natural drying;
(9) draw the obtained cationic yellow stain of appropriate step (5) with suction pipe, be applied to impression of the hand surface, then wash removal floating color with water, observe under long-wave ultra violet lamp, impression of the hand, in bright yellow green, the results are shown in accompanying drawing 2.
Embodiment 3:
(1) weigh in the balance and get 5g nano-aluminium oxide, put into conical flask;
(2) in conical flask, add the distilled water of 200ml, and then add 2ml N-octyl group trimethoxy silane, mix homogeneously;
(3) stir in magnetic stirring apparatus, revolution is 800 revs/min, and 60 DEG C of water-baths reflux 2 hours, fully react;
(4) solution will reacted, removes supernatant, uses distilled water cleaning repeatedly, finally adds stabilizing agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and get 0.5g cationic yellow, add 100ml methanol, make cationic yellow stain.
Process for show:
(6) nano-aluminium oxide that step (4) is obtained is manifested liquid and shake up into emulsus;
(7) material of aluminum foil to be checked being suspected to have impression of the hand is immersed in liquid constantly to rock, namely have impression of the hand to show;
(8) loose colour is washed off with clear water, natural drying;
(9) draw the obtained cationic yellow stain of appropriate step (5) with suction pipe, be applied to impression of the hand surface, then wash removal floating color with water, observe under long-wave ultra violet lamp, impression of the hand, in bright yellow green, the results are shown in accompanying drawing 3.
Embodiment 4:
(1) weigh in the balance and get 3.5g nano-titanium oxide, put into conical flask;
(2) in conical flask, add the distilled water of 100ml, and then add 0.5ml N-octyl group trimethoxy silane, mix homogeneously;
(3) stir in magnetic stirring apparatus, revolution is 500 revs/min, and 50 DEG C of water-baths reflux 1.5 hours, fully react;
(4) solution will reacted, removes supernatant, uses distilled water cleaning repeatedly, finally adds stabilizing agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and get 0.3g cationic yellow, add 100ml methanol, make cationic yellow stain.
Process for show:
(6) nano-aluminium oxide that step (4) is obtained is manifested liquid and shake up into emulsus;
(7) the material green plastic to be checked being suspected to have impression of the hand is immersed in liquid constantly to rock, namely have impression of the hand to show;
(8) loose colour is washed off with clear water, natural drying;
(9) draw the obtained cationic yellow stain of appropriate step (5) with suction pipe, be applied to impression of the hand surface, then wash removal floating color with water, observe under long-wave ultra violet lamp, impression of the hand, in bright yellow green, the results are shown in accompanying drawing 4.
Embodiment 5:
(1) weigh in the balance and get 4.5g nano-titanium oxide, put into conical flask;
(2) in conical flask, add the distilled water of 150ml, and then add 1.5ml N-octyl group trimethoxy silane, mix homogeneously;
(3) stir in magnetic stirring apparatus, revolution is 700 revs/min, and 20 DEG C of water-baths reflux 2 hours, fully react;
(4) solution will reacted, removes supernatant, uses distilled water cleaning repeatedly, finally adds stabilizing agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and get 0.4g cationic yellow, add 100ml methanol, make cationic yellow stain.
Process for show:
(6) nano-aluminium oxide that step (4) is obtained is manifested liquid and shake up into emulsus;
(7) the red lacquer painting can of material to be checked being suspected to have impression of the hand is immersed in liquid constantly to rock, namely have impression of the hand to show;
(8) loose colour is washed off with clear water, natural drying;
(9) draw the obtained cationic yellow stain of appropriate step (5) with suction pipe, be applied to impression of the hand surface, then wash removal floating color with water, observe under long-wave ultra violet lamp, impression of the hand, in bright yellow green, the results are shown in accompanying drawing 5.
Embodiment 6:
(1) weigh in the balance and get 3g nano-aluminium oxide, put into conical flask;
(2) in conical flask, add the distilled water of 200ml, and then add 2ml N-octyl group trimethoxy silane, mix homogeneously;
(3) stir in magnetic stirring apparatus, revolution is 800 revs/min, and 60 DEG C of water-baths reflux 2 hours, fully react;
(4) solution will reacted, removes supernatant, uses distilled water cleaning repeatedly, finally adds stabilizing agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and get 0.5g cationic yellow, add 100ml methanol, make cationic yellow stain.
Process for show:
(6) nano-aluminium oxide that step (4) is obtained is manifested liquid and shake up into emulsus;
(7) the green lacquer painting can of material to be checked being suspected to have impression of the hand is immersed in liquid constantly to rock, namely have impression of the hand to show;
(8) loose colour is washed off with clear water, natural drying;
(9) draw the obtained cationic yellow stain of appropriate step (5) with suction pipe, be applied to impression of the hand surface, then wash removal floating color with water, observe under long-wave ultra violet lamp, impression of the hand, in bright yellow green, the results are shown in accompanying drawing 6.
Claims (10)
1., based on two step developing latent finger prints methods of nano-particle, comprise nano-particle and manifest the preparation of liquid, the preparation of organic fluorescent dye coloring agent and two step method and manifest fingerprint, it is characterized in that, the preparation that described nano-particle manifests liquid comprises the steps:
(1) powder of nanometric particles is taken;
(2) first add polar solvent, then add surfactant or surface-functionalized reagent;
(3) under agitation, water-bath back flow reaction;
(4) after reaction terminates, use centrifuge, rotating speed is 7000-9000 revolutions per second, removing supernatant, and solubilizer cleans, and repeated washing 3 times, finally adds stabilizing agent, makes nano-particle and manifests liquid;
The preparation of described organic fluorescent dye coloring agent comprises the steps:
(5) take organic fluorescent dye, add in polar solvent, shake up dispersion, make organic fluorescent dye coloring agent;
Described two step method manifests fingerprint and comprises the steps:
(6) nano-particle that step (4) is made is manifested liquid and shake up into emulsus, the material to be checked being suspected to have impression of the hand is immersed to manifest in liquid and rocks, or emulsus is manifested drop be suspected to have the material surface to be checked of impression of the hand, after leaving standstill, namely fingerprint is had to show, then loose colour is washed off with clear water, natural drying;
(7) draw the organic fluorescent dye coloring agent that appropriate step (5) is made, be applied to impression of the hand surface, then wash removal floating color with water, observe under long-wave ultra violet lamp.
2. a kind of two step developing latent finger prints methods based on nano-particle according to claim 1, it is characterized in that, in described step (1), powder of nanometric particles is nano-aluminium oxide or nano zine oxide, and the amount of taking is 3-5g.
3. a kind of two step developing latent finger prints methods based on nano-particle described in claim 1 or 2, it is characterized in that, in described step (2), surfactant or surface-functionalized reagent are 0.2-2ml N-octyl group trimethoxy silane, and polar solvent is 100-200ml water.
4. a kind of two step developing latent finger prints methods based on nano-particle according to claim 3, it is characterized in that, in described step (3), reaction temperature is 20 DEG C, and stirring condition is 400 turns/min, and the response time is 1 hour.
5. a kind of two step developing latent finger prints methods based on nano-particle according to claim 4, it is characterized in that, in described step (4), solvent is distilled water, and stabilizing agent is distilled water.
6. a kind of two step developing latent finger prints methods based on nano-particle according to claim 5, it is characterized in that, in described step (5), the organic fluorescent dye amount of taking is 0.2-0.5g cationic yellow, and polar solvent addition is 100ml methanol.
7. nano-particle manifests a preparation method for liquid, it is characterized in that, comprises the steps:
(1) powder of nanometric particles is taken;
(2) first add polar solvent, then add surfactant or surface-functionalized reagent;
(3) under agitation, water-bath back flow reaction;
(4), after reaction terminates, removing supernatant, solubilizer cleans, and finally adds stabilizing agent, makes nano-particle and manifest liquid.
8. a preparation method for organic fluorescent dye coloring agent, is characterized in that, comprises the steps:
(1) take organic fluorescent dye, add in polar solvent, shake up dispersion, make organic fluorescent dye coloring agent.
9. two step method manifests a method for fingerprint, it is characterized in that, comprises the steps:
(1) nano-particle is manifested liquid and shake up into emulsus, the material to be checked being suspected to have impression of the hand is immersed in nitrite ion and rocks, or emulsus is manifested drop and be suspected to have the material surface to be checked of impression of the hand, after leaving standstill, namely there is fingerprint to show, then wash loose colour off with clear water, natural drying;
(2) draw organic fluorescent dye coloring agent, be applied to impression of the hand surface, then wash removal floating color with water, observe under long-wave ultra violet lamp, impression of the hand presents high-contrast fluorescent characteristics.
10. a kind of two step developing latent finger prints methods based on nano-particle according to claim 1 or two step method according to claim 9 manifest the method for fingerprint, it is characterized in that, the described material to be checked being suspected to have fingerprint is one or both in metal, pottery, glass, plastics.
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| CN111748336A (en) * | 2020-07-08 | 2020-10-09 | 江苏警官学院 | Fluorescent fingerprint developing powder and preparation method and application thereof |
| CN113925500A (en) * | 2021-10-15 | 2022-01-14 | 沈阳理工大学 | Fingerprint appearing powder and preparation method and application thereof |
| CN115251907A (en) * | 2022-05-09 | 2022-11-01 | 吉林大学 | Fingerprint showing method based on nanosecond laser irradiation |
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| CN106865615A (en) * | 2017-02-14 | 2017-06-20 | 西南政法大学 | A kind of preparation of copper/chromium composite black nanometer powder and its finger mark process for show |
| CN106865615B (en) * | 2017-02-14 | 2018-05-15 | 西南政法大学 | A kind of preparation of copper/chromium composite black nanometer powder and its finger mark process for show |
| CN111748336A (en) * | 2020-07-08 | 2020-10-09 | 江苏警官学院 | Fluorescent fingerprint developing powder and preparation method and application thereof |
| CN111748336B (en) * | 2020-07-08 | 2023-05-02 | 江苏警官学院 | Fluorescent fingerprint developing powder and preparation method and application thereof |
| CN113925500A (en) * | 2021-10-15 | 2022-01-14 | 沈阳理工大学 | Fingerprint appearing powder and preparation method and application thereof |
| CN113925500B (en) * | 2021-10-15 | 2023-09-29 | 沈阳理工大学 | Fingerprint developing powder and preparation method and application thereof |
| CN115251907A (en) * | 2022-05-09 | 2022-11-01 | 吉林大学 | Fingerprint showing method based on nanosecond laser irradiation |
| CN115251907B (en) * | 2022-05-09 | 2024-04-26 | 吉林大学 | Fingerprint display method based on nanosecond laser irradiation |
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