CN101485572A - One-step method for developing latent finger prints using gold nanoparticles - Google Patents
One-step method for developing latent finger prints using gold nanoparticles Download PDFInfo
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- CN101485572A CN101485572A CNA2009100665589A CN200910066558A CN101485572A CN 101485572 A CN101485572 A CN 101485572A CN A2009100665589 A CNA2009100665589 A CN A2009100665589A CN 200910066558 A CN200910066558 A CN 200910066558A CN 101485572 A CN101485572 A CN 101485572A
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Abstract
The invention provides a method used for revealing latent fingerprint in one step by adopting aurum nano granules. A proposal of the method is as follows: glucose modified aurum nano granules or sucrose modified aurum nano granules interreact with ingredients in latent fingerprint within a certain pH range to induce the sedimentary precipitation of the aurum nano granules, thereby clearly and effectively revealing latent fingerprint streakline. The method simplifies revealing steps and realizes one-step revealing of latent fingerprint; moreover, the method can effectively reveal latent fingerprint within a larger pH range; and the aurum nano granules used as revealing agent has simple preparation. The method radically solves the problem that the prior polymetallic sedimentation method has complicated steps during revealing latent fingerprint; meanwhile, the method has no pollution, cheap and easily obtained raw materials and environmental friendliness, and is a simple and effective method used for revealing the latent fingerprint in one step. The method can clearly reveal fingerprints on the surfaces of impermeable objects and damp objects.
Description
Technical field
The invention belongs to a kind of Forensic Science vestige process for show.
Background technology
Fingerprint is called the lines of the hand again, because of having special physiological structure and feature architecture, so become a kind of material evidence that has much superiority.By analyzing, comparing latent fingerprint and known individual fingerprint, can make the conclusion of determining or getting rid of certain suspect.Fingerprint has following characteristics: touch the thing trace, throughout one's life constant, have nothing in common with each other.Thereby identify for the person good platform is provided.Fingerprint once was known as " first of the evidence " by judicial circuit.
In the middle of the 19th century, people have begun the research of fingerprint on scientific meaning.Dr.Henry Faulds (1843-1930), the people who is engaged in Study on Fingerprint in the world the earliest is the great master of the whole world first publication " dactylography " magazine; He has proved the theory of " fingerprint is unchangeable " that omeprazole you (Welker) proposed in 1856, starts that fingerprint manifestation is applied to the scene of a crime evaluation.1877, Charles Robert Richet Aubert is in the process of research dermatosis and glandular secretion, silver nitrate solution is coated in shown sweat fingerprint on the paper, become since then and founded founder (J.Berry, the D.A.Stoney that silver nitrate manifests the fingerprint manifestation technology, in adcances in fingerprinttechnology, ed.H.C.Lee and R.E.Gaensslen, CRC Press, Boca Taton, FL, 2
NdEdn, 2001, ch.4, pp.1-40).In 19 end of the centurys, famous " the Wei Site case " of the U.S. is exactly to determine criminal's by fingerprint identification in two 11 the identical people of personal measurement data.Fingerprint be the most common in the criminal case also be one of the material evidence of most worthy.Finding effectively and extract the offender to be retained in on-the-spot fingerprint, is that correct identification and evaluation are correct identification and identify one of essential condition of offender.Common fingerprint mainly is divided three classes: visible fingerprint, laten fingerprints and plastic fingerprint.Laten fingerprints is sightless, but clear up a criminal case is had great significance, and therefore the fingerprint that need manifest mainly is meant laten fingerprints.The developing latent finger prints using method can be divided into physics appearance method (optical method, powder method etc.), chemical appearance method (ninhydrin method, DFO method etc.) and physical chemistry appearance method (iodine fumigation, smoked method, silver nitrate method, the many precipitated metals method of showing of 502 glue).Wherein applicating history at most, method is a powder method the most widely, and this in recent years method has had significant improvement again, as the appearance of Magnaglo and fluorescent type powder, all greatly improved the sensitivity of this method.The sensitivity and the powder size of this method have direct relation, and the more little then sensitivity of granularity is high more.But more little its of granularity suspends just big more in air and the time is of a specified duration more, and therefore the physical impairment to the professional and technical personnel is just big more.The deadly defect of this method is that sensitivity is low, can not manifest outmoded fingerprint simultaneously.Other fingerprint on site process for show, as spray apparent method owing to used by the restriction of chlorofluorocarbon, lost using value.The development of novel gasifying agent is owing to be subjected to the restriction of safety and cost, also achieving no breakthrough property progress.Saunders utilized many precipitated metals method to manifest laten fingerprints in 1989, and this method comprises two step wet-chemical processes.The first step comprises and will be shown the gold nano solution that object is soaked in pH=2.5-2.8 that this moment, the developing latent finger prints using effect was relatively poor.Second step, to handle the object enhancing with the physics developer and manifest effect, this moment, fingerprint ridge became black by canescence.According under acid condition, aminoacid, polypeptide and the protein etc. in the positive charge fingerprint residues thing that has and surface have the gold nano generation Electrostatic Absorption of negative charge.Be adsorbed in separating out of golden nanometer particle catalysis silver on the fingerprint ridge afterwards, manifest the laten fingerprints streakline clearly.People such as Margot, Almog, Stauffer have carried out further investigation and have improved (M.J.Choi, A.M.McDonagh.Metal-containing nanoparticles and nano-structured particles infingermark detection.Forensic Science International.2008.179.2-3.87-97) this technology afterwards.But this method step is still comparatively loaded down with trivial details, complexity.
Summary of the invention
One step of employing golden nanometer particle method for manifesting latent fingerprints provided by the invention, its step and condition are as follows:
Described golden nanometer particle is the golden nanometer particle of glucose modified or the golden nanometer particle of sucrose modified;
(1) adopt the golden nanometer particle one of glucose modified to go on foot method for manifesting latent fingerprints:
The preparation of the golden nanometer particle of glucose modified: under agitation, in gold chloride and glucose mixed solution, dropwise add sodium borohydride frozen water solution.Stopped reaction behind the 30min-120min obtains the golden nanometer particle of particle size range at 1.0nm-5.0nm; Gold chloride wherein, the amount of substance of glucose and sodium borohydride is than being 1:(5～20): (5～20);
One step manifested laten fingerprints: with the golden nanometer particle of above-mentioned preparation, with citric acid or acetum adjust pH at 3.6-2.0, the object that will be loaded with laten fingerprints afterwards immerses, take out behind the 10min-60min, the golden nanometer particle that does not have absorption with the tap water flush away, naturally dry, promptly can observe fingerprint ridge clearly.
(2) adopt the golden nanometer particle one of sucrose modified to go on foot method for manifesting latent fingerprints:
The preparation of the golden nanometer particle of sucrose modified: under agitation, in gold chloride and sucrose mixed solution, dropwise add sodium borohydride frozen water solution.Stopped reaction behind the 30min-120min obtains the golden nanometer particle of particle size range at 2.0nm-12.0nm; Gold chloride wherein, the amount of substance of glucose and sodium borohydride is than being 1:(5～20): (5～20);
One step manifested laten fingerprints: with the golden nanometer particle of above-mentioned preparation, transfer pH at 6.0-2.0 with citric acid solution or acetum, the object that will be loaded with laten fingerprints afterwards immerses, take out behind the 10min-60min, the golden nanometer particle that does not have absorption with the tap water flush away, naturally dry, promptly can observe fingerprint ridge clearly.
Beneficial effect: the invention provides and adopt one step of golden nanometer particle method for manifesting latent fingerprints.Adopt the golden nanometer particle of glucose modified or the golden nanometer particle of sucrose modified.The enforcement the solution of the present invention is: the golden nanometer particle of glucose modified or the golden nanometer particle of sucrose modified, in certain pH range with laten fingerprints in composition interact, induce the golden nanometer particle deposition to separate out, thus the clear laten fingerprints streakline that manifests effectively.This method has been simplified and has been manifested step, has realized that one step of golden nanometer particle manifests laten fingerprints; In bigger pH scope, can both effectively manifest laten fingerprints; Golden nanometer particle preparation as visualization reagent is simple.The present invention has fundamentally solved the problem of the existing laten fingerprints complex steps of traditional many precipitated metals Faxian, and simple to operate, pollution-free, raw material is cheap and easy to get, and environmental friendliness is an a kind of simple and effective step method for manifesting latent fingerprints.This method is for the impermeability object, and the fingerprint on moist object surface can both clearly manifest.
Description of drawings
Accompanying drawing 1, be used for glass surface developing latent finger prints using image for the gold nano of glucose modified
Accompanying drawing 2, be used for frosting developing latent finger prints using image for the gold nano of glucose modified
Accompanying drawing 3, be used for tinfoil surface developing latent finger prints using image for the gold nano of glucose modified
Accompanying drawing 4, be used for glass surface developing latent finger prints using image for the gold nano of sucrose modified
Accompanying drawing 5, be used for frosting developing latent finger prints using image for the gold nano of sucrose modified
Accompanying drawing 6, be used for tinfoil surface developing latent finger prints using image for the gold nano of sucrose modified
The specific embodiment
Embodiment 1: one step of the golden nanometer particle method for manifesting latent fingerprints that adopts glucose modified:
The preparation of the golden nanometer particle of glucose modified: under agitation, to 20ml concentration is in the glucose mixed solution of the gold chloride of 0.25mmol/L and 10mmol/L, dropwise adding 2ml concentration is the sodium borohydride frozen water solution of 20.0mmol/L, stopped reaction behind the 30min.
One step manifested laten fingerprints: with the golden nanometer particle of above-mentioned preparation, transfer pH 3.6 with citric acid solution, the glass that will be loaded with laten fingerprints afterwards immerses, take out behind the 15min, with the unnecessary golden nanometer particle of tap water flush away, dry naturally, promptly can observe fingerprint ridge clearly.(accompanying drawing 1)
Embodiment 2: one step of the golden nanometer particle method for manifesting latent fingerprints that adopts glucose modified:
The preparation of the golden nanometer particle of glucose modified: under agitation, be that dropwise adding 2ml concentration is the sodium borohydride frozen water solution of 0.3mol/L, stopped reaction behind the 60min in the glucose mixed solution of the gold chloride of 5.0mmol/L and 50mmol/L to 20ml concentration.
One step manifested laten fingerprints: with the golden nanometer particle of above-mentioned preparation, transfer pH 3.0 with acetum, the object that will be loaded with laten fingerprints afterwards immerses, take out behind the 30min, with the unnecessary golden nanometer particle of tap water flush away, dry naturally, promptly can observe fingerprint ridge clearly.(accompanying drawing 2)
Embodiment 3: one step of the golden nanometer particle method for manifesting latent fingerprints that adopts glucose modified:
The preparation of the golden nanometer particle of glucose modified: under agitation, be in the glucose mixed solution of the gold chloride of 10.0mmol/L and 60mmol/L, dropwise add the sodium borohydride frozen water solution of 2ml concentration 2.0mol/L, stopped reaction behind the 120min to 20ml concentration.
One step manifested laten fingerprints: with the golden nanometer particle of above-mentioned preparation, transfer pH 2.0 with citric acid solution, the object that will be loaded with laten fingerprints afterwards immerses, take out behind the 60min, with the unnecessary golden nanometer particle of tap water flush away, dry naturally, promptly can observe fingerprint ridge clearly.(accompanying drawing 3)
Embodiment 4: one step of the golden nanometer particle method for manifesting latent fingerprints that adopts sucrose modified:
The preparation of the golden nanometer particle of sucrose modified: under agitation, be that dropwise adding 2ml concentration is the sodium borohydride frozen water solution of 25mmol/L, stopped reaction behind the 30min in the sucrose mixed solution of the gold chloride of 0.25mmol/L and 1.25mmol/L to 20ml concentration.
One step manifested laten fingerprints: with the golden nanometer particle of above-mentioned preparation, transfer pH 6.0 with citric acid solution, the glass that will be loaded with laten fingerprints afterwards immerses, take out behind the 10min, with the unnecessary golden nanometer particle of tap water flush away, dry naturally, promptly can observe fingerprint ridge clearly.(accompanying drawing 4)
Embodiment 5: one step of the golden nanometer particle method for manifesting latent fingerprints that adopts sucrose modified:
The preparation of the golden nanometer particle of sucrose modified: under agitation, be that dropwise adding 2ml concentration is the sodium borohydride frozen water solution of 0.35mol/L, stopped reaction behind the 60min in the sucrose mixed solution of the gold chloride of 7.0mmol/L and 50mmol/L to 20ml concentration.
One step manifested laten fingerprints: with the golden nanometer particle of above-mentioned preparation, transfer pH 3.5 with citric acid solution, the object that will be loaded with laten fingerprints afterwards immerses, take out behind the 30min, with the unnecessary golden nanometer particle of tap water flush away, dry naturally, promptly can observe fingerprint ridge clearly.(accompanying drawing 5)
Embodiment 6: one step of the golden nanometer particle method for manifesting latent fingerprints that adopts sucrose modified:
The preparation of the golden nanometer particle of sucrose modified: under agitation, be that dropwise adding 2ml concentration is the sodium borohydride frozen water solution of 0.1mol/L, stopped reaction behind the 120min in the glucose mixed solution of the gold chloride of 10.0mmol/L and 0.2mol/L to 20ml concentration.
One step manifested laten fingerprints: with the golden nanometer particle of above-mentioned preparation, transfer pH 2.0 with acetum, the object that will be loaded with laten fingerprints afterwards immerses, take out behind the 60min, with the unnecessary gold nano of tap water flush away, dry naturally, promptly can observe fingerprint ridge clearly.(accompanying drawing 6)
Claims (1)
1, adopt one step of golden nanometer particle method for manifesting latent fingerprints, its step and condition are as follows:
Described golden nanometer particle is the golden nanometer particle of glucose modified or the golden nanometer particle of sucrose modified;
(1) adopt the golden nanometer particle one of glucose modified to go on foot method for manifesting latent fingerprints:
The preparation of the golden nanometer particle of glucose modified: under agitation, in the mixed solution of gold chloride and glucose, dropwise add sodium borohydride frozen water solution, stopped reaction behind the 30min-120min obtains the golden nanometer particle of particle size range at 1.0nm-5.0nm; Gold chloride wherein, the amount of substance of glucose and sodium borohydride is than being 1:5～20:5～20;
One step manifested laten fingerprints: with the golden nanometer particle of above-mentioned preparation, with citric acid or acetum adjust pH at 3.6-2.0, the object that will be loaded with laten fingerprints afterwards immerses, take out behind the 10min-60min, the gold nano that does not have absorption with the tap water flush away, naturally dry, promptly can observe fingerprint ridge clearly; Perhaps,
(2) adopt the golden nanometer particle one of sucrose modified to go on foot method for manifesting latent fingerprints:
The preparation of the golden nanometer particle of sucrose modified: under agitation, in the mixed solution of gold chloride and sucrose, dropwise add sodium borohydride frozen water solution, stopped reaction behind the 30min-120min obtains the golden nanometer particle of particle size range at 2.0nm-12.0nm; Gold chloride wherein, the amount of substance of glucose and sodium borohydride is than being 1:5～20:5～20;
One step manifested laten fingerprints: with the gold nano solution of above-mentioned preparation, transfer pH at 6.0-2.0 with citric acid solution, the object that will be loaded with laten fingerprints afterwards immerses, take out behind the 10min-60min, with the tap water flush away do not have absorption gold nano, dry naturally, promptly can observe fingerprint ridge clearly.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103598890A (en) * | 2013-11-13 | 2014-02-26 | 北京科技大学 | High-resolution latent blood fingerprint image collecting method based on scanning electrochemical microscope (SECM) |
| CN106073795A (en) * | 2016-06-02 | 2016-11-09 | 西南政法大学 | Gold nanoclusters Sweat latent fingerprint visualization reagent preparation method and Sweat latent fingerprint process for show |
-
2009
- 2009-02-24 CN CN2009100665589A patent/CN101485572B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103598890A (en) * | 2013-11-13 | 2014-02-26 | 北京科技大学 | High-resolution latent blood fingerprint image collecting method based on scanning electrochemical microscope (SECM) |
| CN106073795A (en) * | 2016-06-02 | 2016-11-09 | 西南政法大学 | Gold nanoclusters Sweat latent fingerprint visualization reagent preparation method and Sweat latent fingerprint process for show |
| CN106073795B (en) * | 2016-06-02 | 2019-04-05 | 西南政法大学 | Gold nanoclusters Sweat latent fingerprint visualization reagent preparation method and Sweat latent fingerprint process for show |
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