CN104337522A - Method for displaying latent fingerprints by adopting fluorescent dye-modified nano particles - Google Patents
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- A61B5/117—Identification of persons
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- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
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Abstract
The invention provides a method for displaying latent fingerprints by adopting fluorescent dye-modified nano particles. By the adoption of organic fluorescent dye chemical modified nano particles, fluorescence excitation of a normal light source during fingerprint displaying and multi-waveband fluorescence emission are realized; residues with doubtful fingerprints are put into a uniformly vibrated displaying agent, then unfixed dyes are washed off by clean water, and the residues are naturally dried; when the residues are observed under a long-wave ultraviolet lamp, a high-contrast fluorescence characteristic can be clearly seen. According to the method, the technical difficulties of interference, such as object light reflection, during latent fingerprint displaying, low sensitivity to powder displaying, low combination property, limited application range and the like are solved; the method is easy to operate and does not have toxic and side effects.
Description
Technical field
The invention belongs to public security Forensic Science field, be specifically related to a kind of method using the nano-particle of organic fluorescent dye chemical modification to prepare reagent to manifest latent fingerprint.
Background technology
Fingerprint, because the many factors such as hereditary material, skin texture, pathology and trauma affect determine fingerprint ridge, there is specificity, multiformity and stability, can be reached by the analysis to fingerprint ridge, identification, qualification and personnel identity be differentiated and assert.Appearing Techniques of Human Fingerprints, mainly by selecting corresponding method (luminescence method, solwution method, powder method, smoked aobvious method etc.) to make light or with the material (perspiration, oil, blood, dirt etc.) manifested in the material of fingerprint and finger mark, association reaction occurring, latent fingerprint is made to be oil, blood dirt etc.) there is association reaction, make latent fingerprint be coloured fingerprint manifestation technology out.
1877, Charles Robert Richet Aubert, in research dermatosis and glandular secretion process, adopted silver nitrate as solution, sweat fingerprint is manifested, has started the history of fingerprint manifestation.Now, in the detection process of case, on-the-spot fingerprint extraction and qualification are the important means of criminal investigation.Wherein visible fingerprint, laten fingerprints and plastic fingerprint are modal three class fingerprint on site, and laten fingerprints is more important one, adopt easy reliable means to obtain laten fingerprints and have great importance.
The method of current identification laten fingerprints can be divided into three major types: physics appearance method, chemical appearance method and physical chemistry appearance method.Powder appearance method in physics appearance method, easy and simple to handle, cost compare is cheap, and the scope of application is wider, effect is fine, but the method has certain requirement to duration, easily damages fingerprint track, and powder flies away in atmosphere, form dust, larger to staff's injury; Another kind of physics appearance method, i.e. vacuum metal deposition method, the method due to cost higher, troublesome poeration, does not popularize.Physical chemistry appearance method, comprises many precipitated metals method, silver nitrate method, and iodine fumigation and " 502 " glue fumigation show method etc., and the method is manifesting effect, duration and to Shortcomings in the injury of human body etc.Chemistry appearance method also comprises a lot of content, but also there is deficiency.Therefore, scientific research personnel has done again a large amount of work in fingerprint manifestation.
In recent years, the Application of micron that develops into of nanosecond science and technology specifies good developing direction in manifesting of potential finger mark.Nano material is due to its have that macroscopic material do not have special and the physicochemical properties of excellence (selectivity, magnetic, fluorescence etc.), thus can not only be combined by physics, chemical action and be marked on fingerprint with being retained in the inorganic substances in the finger mark on object, organic substance etc., also there is the character producing fluorescence by optical excitation, fluorescence is produced, the fluorescence imaging utilizing the nano material of certification mark on finger mark to send and clear reflection fingerprint characteristic by the light source irradiation excitation nano granule such as ultraviolet light.
But manifest in the actual combat work of fingerprint at nano-particle, on the one hand due to multiformity and the complexity of fingerprint carrying object, the simple color relying on nano-particle itself, the high-contrast that cannot realize fingerprint manifestation manifests; When nano-particle fluorescence manifests fingerprint on the other hand, need exciting of the LASER Light Source of specific band, just can obtain the fluorescent emission of nano-particle.The application in actual combat that these limitation make nano-particle manifest for latent fingerprint is had a greatly reduced quality.Therefore, study the Fluorescence fingerprint process for show that a kind of broadband based on nano-particle or common optical band excite, there is important using value.
Patent 201410078720.X proposes a kind of method that many metal deposition technique manifest laten fingerprints, and optionally in fingerprint ridge line region, successively depositing silver and copper particle make it present grey black, and valley line district does not change, thus by fingerprint manifestation out.But it is more loaded down with trivial details to there is operation in the method, and fingerprint manifestation has certain limitation.
Patent 200910066494.2 discloses the method that a kind of ZnS, ZnO and functionalized nano granule thereof manifest for different surfaces latent fingerprint, for different objects surface, is stenciled by different powder respectively on laten fingerprints surface, thus realizes manifesting of laten fingerprints.It is more loaded down with trivial details equally that the method prepares functionalized particle, and in use need differentiate for different object surfaces.
Patent 201310364617.7 is using bovine serum albumin as protective agent, and gold nanoclusters is fluorometric reagent, can manifest with sensitivity laten fingerprints; in the method, fingerprint manifestation is more clear; and stability is also higher, but raw material receives restriction, and operating process requires also higher.
In sum, the process for show of existing laten fingerprints is a lot, but all there is deficiency, can not effectively overcome during latent fingerprint manifests run into such as bear the reflective interference of object background, susceptiveness that powder manifests is weak, associativity is poor and the technological difficulties such as range of application restriction.
Summary of the invention
The object of this invention is to provide a kind of effectively overcome during latent fingerprint manifests run into such as bear the reflective interference of object background, susceptiveness that powder manifests is weak, associativity is poor and the method for the technological difficulties such as range of application restriction.
One aspect of the present invention provides a kind of latent fingerprint and manifests liquid, and the nano-particle modified by organic fluorescent dye prepares, and its preparation method comprises the following steps:
(1) mixed liquor is mixed with the powder of nanometric particles of 2-5g and 0.1-1g organic fluorescent dye;
(2) surfactant of 0.2-2ml or surface-functionalized reagent and 100-200ml polar solvent is added;
(3) under the 20-60 DEG C of agitation revolution with 200-1000 rev/min, 2-4 hour is reacted;
(4), after reaction terminates, solubilizer cleaning repeatedly, finally adds stabilizing agent, makes and manifest liquid.Preferably, in described step (1), powder of nanometric particles is nano zine oxide or nano aluminium oxide, and organic fluorescent dye is lemon yellow, fluorescence green, rose-red, is preferably lemon yellow; Preferred, described step (1) specifically comprises: get 2-5g nano zine oxide and 0.1-1g lemon yellow, put into conical flask and shake up, make mixed liquor.
Preferably, in described step (2), surfactant or surface-functionalized reagent are N-octyl group trimethoxy silane, and polar solvent is methanol or ethanol; Preferred, above-mentioned steps (2) specifically comprises: in conical flask, add 100-200ml polar solvent methanol 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; Preferred, above-mentioned steps (3) specifically comprises: 20-60 DEG C of water-bath reflux 2-4 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, and preferred described solvent is distilled water, and described stabilizing agent is methanol or water, and preferred described stabilizing agent is distilled water; Preferred, above-mentioned steps (4) specifically comprises: after reaction terminates, add distilled water and clean, remove supernatant after sedimentation, retains sedimentation material, and what add that distilled water is made into 100ml manifests liquid.
Another aspect provides a kind of process for show of latent fingerprint, achieve the fluorescence excitation of common light sources in fingerprint manifestation, and multiband fluorescence is launched, the method comprises:
(1) mixed liquor is mixed with the powder of nanometric particles of 2-5g and 0.1-1g organic fluorescent dye;
(2) surfactant of 0.2-2ml or surface-functionalized reagent and 100-200ml polar solvent is added;
(3) under the 20-60 DEG C of agitation revolution with 200-1000 rev/min, 2-4 hour is reacted;
(4), after reaction terminates, solubilizer cleaning repeatedly, finally adds stabilizing agent, makes and manifest liquid;
(5) material to be checked being suspected to have fingerprint is put into the liquid that manifests made and be maybe suspected to have the material surface to be checked of fingerprint by manifesting drop, after leaving standstill, namely have fingerprint to show, fully contact, then use clean water, observe under uviol lamp after drying.
Preferably, in described step (5), described material can be metal, pottery, glass, plastics etc.; 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.Preferredly specifically to comprise in above-mentioned steps (5): liquid will be manifested and shake up into emulsus, the material to be checked being suspected to have fingerprint is immersed in liquid constantly rock, namely fingerprint is had to show, then loose colour is washed off with clear water, natural drying, observe under long-wave ultra violet lamp, fingerprint presents high-contrast fluorescent characteristics.
Tool of the present invention has the following advantages:
1. latent fingerprint process for show of the present invention is easy, easily operates, and material therefor is all more common, easily obtains, and achieves the fluorescence excitation of common light sources in fingerprint manifestation, and multiband fluorescence is launched.
2. the nano-particle that organic fluorescent dye of the present invention is modified manifests liquid and both on the granularity of solution, dispersibility, was better than traditional nano granule suspension, preponderate in showing in rate, sensitivity and repeatability of fingerprint again, especially, rate and highly sensitive advantage is showed when using the combination of Zinc oxide nanoparticle and lemon yellow more can embody.
3. the present invention with the colour contrast of sample and the light levels of fingerprint on be also better than traditional nano granule suspension manifest effect.
4. the present invention has no side effect, easy to use, and cost is also lower.
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.
Fig. 7 be adopt different organic fluorescent dye in embodiment 7 method to laten fingerprints manifest comparing result, comply with from left to right
Secondary be lemon yellow group, fluorescence green group, rose-red group.
Detailed description of the invention
Embodiment 1:
(1) lemon yellow weighing the nano zine oxide and 0.1g of getting 2g respectively in the balance puts into conical flask, shakes up fully;
(2) measure the methanol of 100ml and the N-octyl group trimethoxy silane of 0.2ml with graduated cylinder, put into conical flask;
(3) conical flask is put into the water-bath reflux 2 hours of 20 DEG C, by magnetic stirrer, revolution is 400 revs/min, fully reacts.
(4), after reaction terminates, add distilled water and precipitate, after sedimentation, remove supernatant.Repeat operation 3 to 4 times and carry out alcohol process.Then retain sedimentation material, what add that distilled water is made into 100ml manifests liquid.
Process for show:
(1) nano zine oxide-lemon yellow obtained above being manifested liquid shakes up in emulsus, is immersed in liquid by the experimental material whiteware being suspected to have fingerprint, constantly rocks;
(2) loose colour is washed off with clear water, natural drying;
(3) observe under long-wave ultra violet lamp, yellow green fingerprint clearly can be shown, the results are shown in accompanying drawing 1.
Embodiment 2:
(1) lemon yellow weighing the nano aluminium oxide and 0.5g of getting 3g respectively in the balance puts into conical flask, shakes up fully;
(2) measure the methanol of 150ml and the N-octyl group trimethoxy silane of 1ml with graduated cylinder, put into conical flask;
(3) conical flask is put into the water-bath reflux 3 hours of 40 DEG C, by magnetic stirrer, revolution is 600 revs/min, fully reacts.
(4), after reaction terminates, add distilled water and precipitate, after sedimentation, remove supernatant.Repeat operation 3 to 4 times and carry out alcohol process.Then retain sedimentation material, what add that distilled water is made into 100ml manifests liquid.
Process for show:
(1) nano aluminium oxide-lemon yellow obtained above being manifested liquid shakes up in emulsus, is immersed in liquid by the experimental material glass with fingerprint, constantly rocks;
(2) loose colour is washed off with clear water, natural drying;
(3) observe under long-wave ultra violet lamp, fingerprint clearly can be shown, the results are shown in accompanying drawing 2.
Embodiment 3:
(1) lemon yellow weighing the nano zine oxide and 0.7g of getting 4g respectively in the balance puts into conical flask, shakes up fully;
(2) measure the methanol of 200ml and the N-octyl group trimethoxy silane of 1.5ml with graduated cylinder, put into conical flask;
(3) conical flask is put into the water-bath reflux 4 hours of 50 DEG C, by magnetic stirrer, revolution is 600 revs/min, fully reacts.
(4), after reaction terminates, add distilled water and precipitate, after sedimentation, remove supernatant.Repeat operation 3 to 4 times and carry out alcohol process.Then retain sedimentation material, what add that distilled water is made into 100ml manifests liquid.
Process for show:
(1) nano zine oxide-lemon yellow obtained above being manifested liquid shakes up in emulsus, is immersed in liquid by the experimental material aluminium foil with fingerprint, constantly rocks;
(2) loose colour is washed off with clear water, natural drying;
(3) observe under long-wave ultra violet lamp, fingerprint clearly can be shown, the results are shown in accompanying drawing 3.
Embodiment 4:
(1) lemon yellow weighing the nano aluminium oxide and 1g of getting 5g respectively in the balance puts into conical flask, shakes up fully;
(2) measure the methanol of 200ml and the N-octyl group trimethoxy silane of 2ml with graduated cylinder, put into conical flask;
(3) conical flask is put into the water-bath reflux 4 hours of 60 DEG C, by magnetic stirrer, revolution is 800 revs/min, fully reacts.
(4), after reaction terminates, add distilled water and precipitate, after sedimentation, remove supernatant.Repeat operation 3 to 4 times and carry out alcohol process.Then retain sedimentation material, what add that distilled water is made into 100ml manifests liquid.
Process for show:
(1) nano aluminium oxide-lemon yellow obtained above being manifested liquid shakes up in emulsus, is immersed in liquid by the experimental material green plastic sheet with fingerprint, constantly rocks;
(2) loose colour is washed off with clear water, natural drying;
(3) observe under long-wave ultra violet lamp, fingerprint clearly can be shown, the results are shown in accompanying drawing 4.
Embodiment 5:
(1) lemon yellow weighing the nano zine oxide and 0.5g of getting 2.5g respectively in the balance puts into conical flask, shakes up fully;
(2) measure the methanol of 150ml and the N-octyl group trimethoxy silane of 1.5ml with graduated cylinder, put into conical flask;
(3) conical flask is put into the water-bath reflux 3 hours of 30 DEG C, by magnetic stirrer, revolution is 500 revs/min, fully reacts.
(4), after reaction terminates, add distilled water and precipitate, after sedimentation, remove supernatant.Repeat operation 3 to 4 times and carry out alcohol process.Then retain sedimentation material, what add that distilled water is made into 100ml manifests liquid.
Process for show:
(1) nano aluminium oxide-lemon yellow obtained above being manifested liquid shakes up in emulsus, is immersed in liquid by the red lacquer painting can of experimental material with fingerprint, constantly rocks;
(2) loose colour is washed off with clear water, natural drying;
(3) observe under long-wave ultra violet lamp, fingerprint clearly can be shown, the results are shown in accompanying drawing 5.
Embodiment 6:
(1) lemon yellow weighing the nano zine oxide and 0.1g of getting 5g respectively in the balance puts into conical flask, shakes up fully;
(2) measure the methanol of 100ml and the N-octyl group trimethoxy silane of 0.2ml with graduated cylinder, put into conical flask;
(3) conical flask is put into the water-bath reflux 2 hours of 20 DEG C, by magnetic stirrer, revolution is 400 revs/min, fully reacts.
(4), after reaction terminates, add distilled water and precipitate, after sedimentation, remove supernatant.Repeat operation 3 to 4 times and carry out alcohol process.Then retain sedimentation material, what add that distilled water is made into 100ml manifests liquid.
Process for show:
(1) nano aluminium oxide-lemon yellow obtained above being manifested liquid shakes up in emulsus, is immersed in liquid by the green lacquer painting can of experimental material with fingerprint, constantly rocks;
(2) loose colour is washed off with clear water, natural drying;
(3) observe under long-wave ultra violet lamp, fingerprint clearly can be shown, the results are shown in accompanying drawing 6.
Embodiment 7:
Different organic fluorescent dye manifests contrast test to laten fingerprints:
(1) weigh in the balance respectively the lemon yellow of nano-aluminium oxide and the 0.25g getting 2.5g, fluorescence green, rose-red in one put into conical flask, shake up fully;
(2) measure the methanol of 150ml and the N-octyl group trimethoxy silane of 0.5ml with graduated cylinder, put into conical flask;
(3) conical flask is put into the water-bath reflux 2 hours of 50 DEG C, by magnetic stirrer, revolution is 700 revs/min, fully reacts.
(4), after reaction terminates, add distilled water and precipitate, after sedimentation, remove supernatant.Repeat operation 3 to 4 times and carry out alcohol process.Then retain sedimentation material, what add that distilled water is made into 100ml manifests liquid.
Process for show:
(1) by nano aluminium oxide-lemon yellow obtained above, nano aluminium oxide-fluorescence green or nano aluminium oxide-the rose-red liquid that manifests shakes up in emulsus, the experimental material glass with fingerprint of identical material is immersed in liquid, constantly rocks;
(2) loose colour is washed off with clear water, natural drying;
(3) observe under long-wave ultra violet lamp, can fingerprint be shown.
Result of the test:
As Fig. 7 display, be respectively from left to right and use lemon yellow to be organic fluorescent dye group, use fluorescence green for organic fluorescent dye group and use rose-red for organic fluorescent dye group.
Make to detect by an unaided eye and to grade to manifesting result:
"+" represents the rank of fingerprint clear, and it is higher that "+" represents fingerprint clear degree more.
| Group | Lemon yellow group | Fluorescence green group | Rose-red group |
| Manifest effect | ++++ | +++ | ++ |
Claims (10)
1. a developing latent finger prints liquid, is characterized in that, the nano-particle modified by organic fluorescent dye prepares, and preparation method comprises the following steps:
(1) mixed liquor is mixed with the powder of nanometric particles of 2-5g and 0.1-1g organic fluorescent dye;
(2) surfactant of 0.2-2ml or surface-functionalized reagent and 100-200ml polar solvent is added;
(3) under the 20-60 DEG C of agitation revolution with 200-1000 rev/min, 2-4 hour is reacted;
(4), after reaction terminates, solubilizer cleaning repeatedly, finally adds stabilizing agent, makes and manifest liquid.
2. a kind of developing latent finger prints liquid according to claim 1, is characterized in that, in described step (1), powder of nanometric particles is nano zine oxide or nano aluminium oxide, and organic fluorescent dye is lemon yellow, fluorescence green, rose-red.
3. a kind of developing latent finger prints liquid described in any one of claim 1-2, is characterized in that, in described step (2), surfactant or surface-functionalized reagent are N-octyl group trimethoxy silane, and polar solvent is methanol or ethanol.
4. a kind of developing latent finger prints liquid according to claim 3, is characterized in that, described step (3) is: 20-60 DEG C of water-bath reflux 2-4 hour in magnetic stirring apparatus, and setting revolution 400-800 rev/min, makes reactant fully react.
5. a kind of developing latent finger prints liquid according to claim 1, is characterized in that, in described step (4), solvent is distilled water, and stabilizing agent is distilled water.
6. a developing latent finger prints liquid, is characterized in that, the nano-particle modified by organic fluorescent dye prepares, and preparation method comprises the following steps:
(1) get 2-5g powder of nanometric particles and 0.1-1g organic dyestuff, put into conical flask and shake up, make mixed liquor;
(2) in conical flask, add 100-200ml polar solvent methanol and 0.2-2ml surface-functionalized reagent N-octyl group trimethoxy silane;
(3) 20-60 DEG C of water-bath reflux 2-4 hour in magnetic stirring apparatus, setting revolution 400-800 rev/min, makes reactant fully react;
(4) after reaction terminates, add distilled water and clean, remove supernatant after sedimentation, retain sedimentation material, what add that distilled water is made into 100ml manifests liquid.
7. a process for show for laten fingerprints, is characterized in that, comprises the steps:
(1) mixed liquor is mixed with the powder of nanometric particles of 2-5g and 0.1-1g organic fluorescent dye;
(2) surfactant of 0.2-2ml or surface-functionalized reagent and 100-200ml polar solvent is added;
(3) under the 20-60 DEG C of agitation revolution with 200-1000 rev/min, 2-4 hour is reacted;
(4), after reaction terminates, solubilizer cleaning repeatedly, finally adds stabilizing agent, makes and manifest liquid;
(5) material being suspected to have fingerprint is put into make manifest liquid, fully contact, then use clean water, observe under uviol lamp after drying.
8. the process for show of laten fingerprints according to claim 7, is characterized in that, in described step (1), powder of nanometric particles is nano zine oxide or nano aluminium oxide, and organic fluorescent dye is lemon yellow, fluorescence green, rose-red; In described step (2), surfactant or surface-functionalized reagent are N-octyl group trimethoxy silane, and polar solvent is methanol or ethanol; Described step (3) is: 20-60 DEG C of water-bath reflux 2-4 hour in magnetic stirring apparatus, and setting revolution 400-800 rev/min, makes reactant fully react; In described step (4), solvent distilled water, stabilizing agent is distilled water.
9. the process for show of laten fingerprints according to claim 7, it is characterized in that, described step (5) is: will manifest liquid and shake up into emulsus, the material being suspected to have fingerprint is entered in liquid rock, or emulsus is manifested drop and be suspected to have the material surface of fingerprint, after leaving standstill, namely fingerprint is had to show, then wash loose colour off with clear water, natural drying, observe under uviol lamp.
10. the process for show of laten fingerprints according to claim 7, is characterized in that, the described material being suspected to have fingerprint is one or both in metal, pottery, glass, plastics.
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| CN107179409A (en) * | 2017-05-17 | 2017-09-19 | 中国药科大学 | A kind of method extracted based on immunoblotting and show blood latent dactylogram |
| CN107219367A (en) * | 2017-05-17 | 2017-09-29 | 中国药科大学 | The extraction of protein component and process for show in a kind of latent fingerprint |
| CN107219367B (en) * | 2017-05-17 | 2019-11-08 | 中国药科大学 | The extraction of protein component and process for show in a kind of latent fingerprint |
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