CN104382600B - 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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- CN104382600B CN104382600B CN201410680319.3A CN201410680319A CN104382600B CN 104382600 B CN104382600 B CN 104382600B CN 201410680319 A CN201410680319 A CN 201410680319A CN 104382600 B CN104382600 B CN 104382600B
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Classifications
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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
- A61B5/48—Other medical applications
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 the latent finger of a kind of two steps based on nano-particle
Stricture of vagina process for show.
Background technology
Due to the interaction of sweat mixed with dirt and oils and fats with body surface when fingerprint refers to the finger touching object of people,
Leave the impression of reflection finger skin papillary ridges on a surface of an.Fingerprint is with its special physiology knot
Structure and feature architecture, in one of the criminal investigation field material evidence becoming most worthy.Fingerprint identification be into
One of reliable method that row individual identifies, plays very important effect 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 are just
Fingerprint has been started research.1856, omeprazole that proposed the theory of " fingerprint is unchangeable ", i.e. refers to
Stricture of vagina has invariance.Additionally, fingerprint also has uniqueness and heritability, owing to everyone has oneself only
Some Finger-print labelling methods, therefore, the centuries, fingerprint becomes the police and accuses of the important clue of suspect.1892
Year, the method that the police of Argentina utilize fingerprint to contrast has cracked criminal case together, becomes fingerprint in case
Crack the first case of middle application.Entering 20 century 70s, the development of computer technology makes to refer to
Stricture of vagina technology is quickly applied.
Latent fingerprint is most important one in three kinds of fingerprint on site, and the method for latent fingerprint recognition is carried out
Substantial amounts of research, is broadly divided into three major types, i.e. chemistry appearance method, physics appearance method and physical chemistry manifests
Method.Physics appearance method mainly includes powder method and vacuum metal deposition method etc., and the method utilizes perspiration material
Adhesive attraction, by one material adsorb on fingerprint ridge so that fingerprint line shows color.Physics
Method is easy and simple to handle, quick, but can cause the destruction of fingerprint, and often can be good for the health of staff
Health causes damage.Chemistry appearance method includes that ninhydrin method, fluorescent material appearance method, DFO method, dyestuff are inhaled
Attached method and electrochemical polymerization method etc., the method mainly utilizes the aminoacid etc. contained in chemical substance and fingerprint to enter
Row reaction, so that fingerprint manifestation is out.The injury that staff is caused by this method compared with Physical
Little, but chemical method susceptiveness is weak, and limitation is big.Physico-chemical process mainly include many precipitated metals method,
Silver nitrate method, iodine fumigation and " 502 " glue fumigation etc..
In sum, the authentication method of the latent fingerprint of tradition exists a lot of not enough, such as insufficient sensitivity, easily
Protected from environmental etc..Nanosecond science and technology are a kind of new techniques grown up in recent years, in a lot of fields all
Achieving remarkable achievement, scientific research personnel is applied in the appearing technique of latent fingerprint, achieves
Certain technological break-through.
Nano material relatively macroscopic material has good physicochemical properties, including selectivity, magnetic and
Fluorescence etc., these character so that nano material and the inorganic substances being retained in criminal scene finger mark,
Organic substances etc. combine, and show latent fingerprint.Meanwhile, nano-particle is after being irradiated by light sources such as ultraviolet lights
Can produce fluorescence, fluorescence imaging that the nano material utilizing detection to be marked on finger mark is sent and the most anti-
Reflect fingerprint characteristic.Therefore, research nano material application in latent manifests is one weight of fingerprint technique
The research direction wanted.
In the actual application of nano material, owing to the object surface mass at fingerprint place is of a great variety, only
Color merely with nano-particle itself, it is impossible to realize the high brightness of fingerprint, high-contrast manifests；Another
Aspect, when nano-particle fluorescence manifests fingerprint, the only nano material of semiconductor property just can be needs spy
Excite under the LASER Light Source of standing wave section, obtain the fingerprint of fluorescent characteristics.Deficiency in terms of these makes nanometer
Granule application in developing latent finger prints is restricted.Therefore, study a kind of based on nano-particle new
Process for show, there is important using value.
Patent 200910066558.9 proposes a kind of side using golden nanometer particle one step to manifest latent fingerprint
Method, the method utilizes the golden nanometer particle of glucose modified or the golden nanometer particle of sucrose modified, one
Interact with the material of residual in object fingerprint surface in the range of fixed pH, thus manifest latent finger
Stricture of vagina.This process simplify the step of developing latent finger prints, environmental sound, but this method does not solve
The problem that nano-particle sensitivity in fingerprint manifestation and nano-particle are combined with fingerprint residues material.
Patent 201410059253.6 discloses a kind of method that aobvious latent fingerprint smoked by wax candle flue dust, and the method will
The latent fingerprint sample of the smoked plating of the wax candle of burning, then imposes external force and makes unstable paddy district candle ash come off, stay
Conjugation relatively Gao Ji district candle ash, can show clear fingerprint.The method is simple and quick, and cost is relatively low,
But fumigation sensitivity is poor, manifests brightness and be also under suspicion.
Patent 201210141370.8 proposes a kind of method utilizing spray to manifest latent fingerprint.There is facility
Property and good fingerprint manifestation effect, but affected bigger by contextual factor.
In sum, the method manifesting latent fingerprint in prior art is a lot, wherein nano-particle manifest effect
Fruit has advantage, but associativity and the fluorescence excitation of common light sources and multiband fluorescence transmitting need to improve；
Fumigation method is easy, quickly, but manifests effect and sensitivity is poor.This research uses a kind of base
In two step fluorescence appearance methods of nano-particle, manifesting effect, manifesting all many-sides such as rate and sensitivity
All it is substantially better than traditional method.
Summary of the invention
It is an object of the invention to provide a kind of developing latent finger prints method of high brightness, high-contrast, and real
The fluorescent emission of common light sources in existing 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.The method first with
The physicochemical characteristics that nano-particle is unique, by the trace thing of method physically or chemically Yu fingerprint surface
Matter combines, it is achieved highly sensitive fingerprint manifestation；Secondly, then with organic fluorescent dye coloured solvent to aobvious
Fingerprint after now carries out adsorption treatment, it is achieved that the high-contrast fluorescent characteristics of fingerprint manifests.
One technical scheme of the present invention relates to nano-particle and manifests the preparation method of liquid, comprises the following steps:
(1) a certain amount of powder of nanometric particles is put in conical flask；
(2) add a certain amount of polar solvent, add a certain amount of surfactant or surface-functionalized
Reagent；
(3) it is positioned in magnetic stirring apparatus, under certain reaction temperature and specified rotation number, water-bath backflow one
The section response time；
(4) after reaction terminates, removing supernatant, solubilizer cleans for several times, is eventually adding stabilizer and makes
Manifest liquid.
Preferably, in described step (1), powder of nanometric particles is nano-aluminium oxide or nano oxidized
Zinc；It is furthermore preferred that described step (1) specifically includes: take 3-5g nano-aluminium oxide and put into cone
In shape bottle.
Preferably, in described step (2), surfactant or surface-functionalized reagent are N-octyl group three
Methoxy silane, polar solvent is water；It is furthermore preferred that above-mentioned steps (2) specifically includes: to conical flask
Middle addition 100-200ml distilled water and the surface-functionalized reagent N of 0.2-2ml-octyl group trimethoxy silane.
Preferably, in described step (3), reaction temperature is 20-60 DEG C, and agitation revolution is 400-800
Rev/min, the response time is 1-2 hour；It is furthermore preferred that above-mentioned steps (3) specifically includes: at magnetic force
In agitator, 20-60 DEG C of water-bath is heated at reflux 1-2 hour, sets revolution 400-800 rev/min so that anti-
Thing is answered fully to react.
Preferably, in described step (4), described solvent is methanol or water, it is furthermore preferred that described
Solvent be distilled water；Described stabilizer is methanol or water, it is furthermore preferred that described stabilizer is for steaming
Distilled water；It is furthermore preferred that above-mentioned steps (4) specifically includes: using centrifuge, rotating speed is 7000-9000
Revolutions per second, remove supernatant, add distilled water and clean, repeated washing 3 times, by Impurity removal, it is eventually adding
What distilled water was configured to 100ml manifests liquid.
Further, a technical scheme of the present invention further relates to the preparation of organic fluorescent dye coloring agent,
Comprise the following steps:
(5) take a certain amount of organic fluorescent dye, add in a certain amount of polar solvent, shake up dispersion,
Make organic fluorochrome stains.
Preferably, in described step (5), organic fluorescent dye coloring agent be cationic yellow, fluorescence green,
Rose-red, preferably cationic yellow；It is furthermore preferred that described step (5) specifically includes: take 0.2-0.5g
Cationic yellow, adds in 100ml methanol, makes cationic yellow stain.
Further, a technical scheme of the present invention further relates to two step method and manifests the technical scheme of latent fingerprint,
Comprise 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 and manifests liquid
In rock, or emulsus manifested drop be suspected to have the material surface to be checked of impression of the hand, after standing, i.e. have fingerprint
Show, then wash loose colour, natural drying off with clear water；
(7) draw appropriate organic fluorescent dye coloring agent with suction pipe, be applied to impression of the hand surface, be washed with water
Loose colour, observes under long-wave ultra violet lamp, and impression of the hand presents high-contrast fluorescent characteristics.
Preferably, in described step (6), it is step (1)-(4) that nano-particle manifests the preparation method of liquid
Shown in；It is furthermore preferred that described material to be checked is metal, pottery, glass, plastics etc..It is furthermore preferred that
Above-mentioned steps (6) specifically includes: nano-aluminium oxide is manifested liquid and shakes up into emulsus, will be suspected to have impression of the hand
Material to be checked immerse in nitrite ion and constantly rock, or emulsus manifested drop treat sample be suspected to have impression of the hand
Material surface, after standing, i.e. has impression of the hand to show, then washes away loose colour, natural drying with clear water.In order to anti-
Only manifest in liquid placement process, appears as distributing raw sedimentation, it is preferred that will become apparent from liquid before use and shake up
Become emulsus.
Preferably, in described step (7), the preparation method of organic fluorescent dye coloring agent is step (5)
Shown in；It is furthermore preferred that above-mentioned steps (7) specifically includes: draw appropriate cationic yellow stain with suction pipe,
Being applied to impression of the hand surface, be washed with water removal floating color, observe under long-wave ultra violet lamp, impression of the hand is bright yellowish green
Color.
Present invention have the advantage that
The most easy and simple to handle, cost is relatively low, nontoxic to staff, is suitable for answering of public security criminal field
With.
2. by the combination of nano-particle Yu fingerprint residues thing, and fluorescent color processes and is undertaken in two steps, and makes
Obtain fingerprint manifestation and there is higher sensitivity and high-contrast fluorescent characteristics.
The most effectively overcome in developing latent finger prints skills such as bearing the reflective interference of background and range of application restriction
Art difficult point.
4. achieve common light sources fluorescence excitation and multiband fluorescence in fingerprint manifestation to launch.
Accompanying drawing explanation
Fig. 1 is to use embodiment 1 method that latent fingerprint on whiteware experimental material is manifested result.
Fig. 2 is to use embodiment 2 method that latent fingerprint on glass check material is manifested result.
Fig. 3 is to use embodiment 3 method that latent fingerprint on aluminium foil experimental material is manifested result.
Fig. 4 is to use embodiment 4 method that latent fingerprint on green plastic experimental material is manifested result.
Fig. 5 is to use embodiment 5 method that latent fingerprint on red lacquer painting can experimental material is manifested knot
Really.
Fig. 6 is to use embodiment 6 method that latent fingerprint on green lacquer painting can experimental material is manifested knot
Really.
Detailed description of the invention
Embodiment 1:
Nano-particle manifests the preparation method of liquid:
(1) weigh in the balance and take 3g nano-aluminium oxide, put in conical flask；
(2) in conical flask, add the distilled water of 100ml, then add 0.2ml N-octyl group trimethoxy
Base silane, mix homogeneously；
(3) stirring in magnetic stirring apparatus, revolution is 400 revs/min, and 20 DEG C of water-baths reflux 1 hour,
Fully reaction；
(4) solution that will have reacted, removes supernatant, uses distilled water to clean repeatedly, is eventually adding steady
Determine agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and take 0.2g cationic yellow, add 100ml methanol, make cationic yellow dyeing
Agent.
Process for show:
(6) nano-aluminium oxide that step (4) prepares is manifested liquid and shake up into emulsus；
(7) make the material whiteware to be checked being suspected to have impression of the hand immerse in liquid constantly to rock, i.e. have impression of the hand to show
Go out；
(8) loose colour, natural drying are washed off with clear water；
(9) draw, with suction pipe, the cationic yellow stain that appropriate step (5) prepares, be applied to impression of the hand surface,
Being washed with water removal floating color, observe under long-wave ultra violet lamp, impression of the hand is bright yellow green, and result is shown in accompanying drawing
1。
Embodiment 2:
(1) weigh in the balance and take 4g nano-aluminium oxide, put in conical flask；
(2) in conical flask, add the distilled water of 150ml, then add 1ml N-octyl group trimethoxy
Silane, mix homogeneously；
(3) stirring in magnetic stirring apparatus, revolution is 600 revs/min, and 30 DEG C of water-baths reflux 1.5 hours,
Fully reaction；
(4) solution that will have reacted, removes supernatant, uses distilled water to clean repeatedly, is eventually adding steady
Determine agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and take 0.4g cationic yellow, add 100ml methanol, make cationic yellow dyeing
Agent.
Process for show:
(6) nano-aluminium oxide that step (4) prepares is manifested liquid and shake up into emulsus；
(7) make the material glass to be checked being suspected to have impression of the hand immerse in liquid constantly to rock, i.e. have impression of the hand to show；
(8) loose colour, natural drying are washed off with clear water；
(9) draw, with suction pipe, the cationic yellow stain that appropriate step (5) prepares, be applied to impression of the hand surface,
Being washed with water removal floating color, observe under long-wave ultra violet lamp, impression of the hand is bright yellow green, and result is shown in accompanying drawing
2。
Embodiment 3:
(1) weigh in the balance and take 5g nano-aluminium oxide, put in conical flask；
(2) in conical flask, add the distilled water of 200ml, then add 2ml N-octyl group trimethoxy
Silane, mix homogeneously；
(3) stirring in magnetic stirring apparatus, revolution is 800 revs/min, and 60 DEG C of water-baths reflux 2 hours,
Fully reaction；
(4) solution that will have reacted, removes supernatant, uses distilled water to clean repeatedly, is eventually adding steady
Determine agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and take 0.5g cationic yellow, add 100ml methanol, make cationic yellow dyeing
Agent.
Process for show:
(6) nano-aluminium oxide that step (4) prepares is manifested liquid and shake up into emulsus；
(7) make the material of aluminum foil to be checked being suspected to have impression of the hand immerse in liquid constantly to rock, i.e. have impression of the hand to show；
(8) loose colour, natural drying are washed off with clear water；
(9) draw, with suction pipe, the cationic yellow stain that appropriate step (5) prepares, be applied to impression of the hand surface,
Being washed with water removal floating color, observe under long-wave ultra violet lamp, impression of the hand is bright yellow green, and result is shown in accompanying drawing
3。
Embodiment 4:
(1) weigh in the balance and take 3.5g nano-titanium oxide, put in conical flask；
(2) in conical flask, add the distilled water of 100ml, then add 0.5ml N-octyl group trimethoxy
Base silane, mix homogeneously；
(3) stirring in magnetic stirring apparatus, revolution is 500 revs/min, and 50 DEG C of water-baths reflux 1.5 hours,
Fully reaction；
(4) solution that will have reacted, removes supernatant, uses distilled water to clean repeatedly, is eventually adding steady
Determine agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and take 0.3g cationic yellow, add 100ml methanol, make cationic yellow dyeing
Agent.
Process for show:
(6) nano-aluminium oxide that step (4) prepares is manifested liquid and shake up into emulsus；
(7) make the material green plastic to be checked being suspected to have impression of the hand immerse in liquid constantly to rock, i.e. have impression of the hand to show
Go out；
(8) loose colour, natural drying are washed off with clear water；
(9) draw, with suction pipe, the cationic yellow stain that appropriate step (5) prepares, be applied to impression of the hand surface,
Being washed with water removal floating color, observe under long-wave ultra violet lamp, impression of the hand is bright yellow green, and result is shown in accompanying drawing
4。
Embodiment 5:
(1) weigh in the balance and take 4.5g nano-titanium oxide, put in conical flask；
(2) in conical flask, add the distilled water of 150ml, then add 1.5ml N-octyl group trimethoxy
Base silane, mix homogeneously；
(3) stirring in magnetic stirring apparatus, revolution is 700 revs/min, and 20 DEG C of water-baths reflux 2 hours,
Fully reaction；
(4) solution that will have reacted, removes supernatant, uses distilled water to clean repeatedly, is eventually adding steady
Determine agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and take 0.4g cationic yellow, add 100ml methanol, make cationic yellow dyeing
Agent.
Process for show:
(6) nano-aluminium oxide that step (4) prepares is manifested liquid and shake up into emulsus；
(7) make the material redness lacquer painting can be checked being suspected to have impression of the hand immerse in liquid constantly to rock, i.e. have hands
Print is showed；
(8) loose colour, natural drying are washed off with clear water；
(9) draw, with suction pipe, the cationic yellow stain that appropriate step (5) prepares, be applied to impression of the hand surface,
Being washed with water removal floating color, observe under long-wave ultra violet lamp, impression of the hand is bright yellow green, and result is shown in accompanying drawing
5。
Embodiment 6:
(1) weigh in the balance and take 3g nano-aluminium oxide, put in conical flask；
(2) in conical flask, add the distilled water of 200ml, then add 2ml N-octyl group trimethoxy
Silane, mix homogeneously；
(3) stirring in magnetic stirring apparatus, revolution is 800 revs/min, and 60 DEG C of water-baths reflux 2 hours,
Fully reaction；
(4) solution that will have reacted, removes supernatant, uses distilled water to clean repeatedly, is eventually adding steady
Determine agent distilled water, make nano-aluminium oxide and manifest liquid.
The preparation of organic fluorescent dye coloring agent:
(5) weigh in the balance and take 0.5g cationic yellow, add 100ml methanol, make cationic yellow dyeing
Agent.
Process for show:
(6) nano-aluminium oxide that step (4) prepares is manifested liquid and shake up into emulsus；
(7) make the material green lacquer painting can be checked being suspected to have impression of the hand immerse in liquid constantly to rock, i.e. have hands
Print is showed；
(8) loose colour, natural drying are washed off with clear water；
(9) draw, with suction pipe, the cationic yellow stain that appropriate step (5) prepares, be applied to impression of the hand surface,
Being washed with water removal floating color, observe under long-wave ultra violet lamp, impression of the hand is bright yellow green, and result is shown in accompanying drawing
6。
Claims (4)
1. two step developing latent finger prints methods based on nano-particle, manifest the preparation of liquid including nano-particle, organic fluorescent dye
Preparation and the two step method of toner manifest fingerprint, it is characterised in that described nano-particle manifests the preparation of liquid and comprises the steps:
(1) powder of nanometric particles is weighed；
(2) it is initially charged polar solvent, adds surfactant or surface-functionalized reagent；
(3) under agitation, water-bath back flow reaction；
(4) after reaction terminates, using centrifuge, rotating speed is 7000-9000 revolutions per second, removes supernatant, and solubilizer cleans, weight
Clean 3 times again, be eventually adding stabilizer, make nano-particle and manifest liquid；
The preparation of described organic fluorescent dye coloring agent comprises the steps:
(5) weigh organic fluorescent dye, add in polar solvent, shake up dispersion, make organic fluorochrome stains；
Described two step method manifests fingerprint and comprises the steps:
(6) nano-particle that step (4) is made is manifested liquid and shakes up into emulsus, immerse to manifest in liquid by the material to be checked being suspected to have impression of the hand and rock,
Or emulsus is manifested drop be suspected to have the material surface to be checked of impression of the hand, after standing, i.e. there is fingerprint to show, then wash off with clear water floating
Color, natural drying；
(7) draw the organic fluorescent dye coloring agent that appropriate step (5) is made, be applied to impression of the hand surface, be washed with water removal floating color, at long wave
Observe under uviol lamp:
In described step (1), powder of nanometric particles is nano-aluminium oxide or nano zine oxide, and the amount of weighing is 3-5g；
In described step (2), surfactant or surface-functionalized reagent are 0.2-2ml N-octyl group trimethoxy silane, polar solvent
For 100-200ml water；
In described step (5), the organic fluorescent dye amount of weighing is 0.2-0.5g cationic yellow, and polar solvent addition is 100ml methanol.
2. a kind of based on nano-particle the two step developing latent finger prints methods described in claim 1, it is characterised in that described step (3)
In, reaction temperature is 20 DEG C, and stirring condition is 400 turns/min, and the response time is 1 hour.
3. a kind of based on nano-particle the two step developing latent finger prints methods described in claim 2, it is characterised in that described step (4)
In, solvent is distilled water, and stabilizer is distilled water.
4. a kind of based on nano-particle the two step developing latent finger prints methods described in claim 1, it is characterised in that described is suspected to have hands
The material to be checked of print is one or both in metal, pottery, glass, plastics.
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| 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 |
| CN111748336B (en) * | 2020-07-08 | 2023-05-02 | 江苏警官学院 | Fluorescent fingerprint developing 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 |
| CN115251907B (en) * | 2022-05-09 | 2024-04-26 | 吉林大学 | Fingerprint display method based on nanosecond laser irradiation |
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| CN101485571A (en) * | 2009-01-20 | 2009-07-22 | 东北师范大学 | Method for developing latent finger prints using zinc sulphide and zinc oxide nanoparticles |
| CN101565619A (en) * | 2009-05-27 | 2009-10-28 | 中国地质大学（武汉） | Small-particle yellow rare-earth fluorescent powder and preparation method and purpose of visualizing latent fingerprint thereof |
| CN101647700A (en) * | 2009-08-28 | 2010-02-17 | 东北师范大学 | Method for using fluorescent silicon dioxide to display laten fingerprint |
| US8574658B1 (en) * | 2011-02-25 | 2013-11-05 | The United States Of America As Represented By The Secretary Of The Navy | Fumeless latent fingerprint detection |
| CN103431867A (en) * | 2013-08-20 | 2013-12-11 | 北京科技大学 | Method for displaying latent fingerprints on fluorogold nano-cluster protected by protein |
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| US20140065290A1 (en) * | 2012-09-04 | 2014-03-06 | Ut-Battelle, Llc | Compositions and methods of use for detection and imaging of prints by surface-enhanced spectroscopic techniques |
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|---|---|---|---|---|
| CN101485571A (en) * | 2009-01-20 | 2009-07-22 | 东北师范大学 | Method for developing latent finger prints using zinc sulphide and zinc oxide nanoparticles |
| CN101565619A (en) * | 2009-05-27 | 2009-10-28 | 中国地质大学（武汉） | Small-particle yellow rare-earth fluorescent powder and preparation method and purpose of visualizing latent fingerprint thereof |
| CN101647700A (en) * | 2009-08-28 | 2010-02-17 | 东北师范大学 | Method for using fluorescent silicon dioxide to display laten fingerprint |
| US8574658B1 (en) * | 2011-02-25 | 2013-11-05 | The United States Of America As Represented By The Secretary Of The Navy | Fumeless latent fingerprint detection |
| CN103431867A (en) * | 2013-08-20 | 2013-12-11 | 北京科技大学 | Method for displaying latent fingerprints on fluorogold nano-cluster protected by protein |
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