CN101446557A - Method for strengthening latent fingerprint observation on non-permeating object by adopting gold nano-material - Google Patents
Method for strengthening latent fingerprint observation on non-permeating object by adopting gold nano-material Download PDFInfo
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- CN101446557A CN101446557A CNA2008100516912A CN200810051691A CN101446557A CN 101446557 A CN101446557 A CN 101446557A CN A2008100516912 A CNA2008100516912 A CN A2008100516912A CN 200810051691 A CN200810051691 A CN 200810051691A CN 101446557 A CN101446557 A CN 101446557A
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Abstract
The invention provides a method for strengthening latent fingerprint observation on non-permeating object by adopting gold nano-material. The method employs gold nano-particles modified by sodium citrate and tannin acid to display latent fingerprint on non-permeating objects. Under the acid condition, the gold nano-particles are absorbed on fingerprint residue of the non-permeating object by electrostatic absorption, and then are placed in silver-salt solution, and silver particles are dissolved out from silver ions by the catalysis of the gold nano-particles modified by the sodium citrate and the tannin acid. The silver particles are deposited on a fingerprint line, thus clearly displaying the latent fingerprint on the surface of the non-permeating objects. The method can better display the latent fingerprint on the surface of the non-permeating objects, and has good effect on old fingerprints. The method is simple and easy, the cost is low, and the synthesized gold nano-solution can be preserved for a long time and used repeatedly; the latent fingerprints on the surfaces of the different non-permeating objects can be clearly observed under visible light without complicated instruments. The method is environmental-friendly and causes no harm to operators.
Description
Technical field
The invention belongs to a kind of criminal technique vestige process for show, be specifically related to a kind of developing latent finger prints using method that adopts the gold nano-material enhancing in non-permeating objects.
Background technology
In the middle of the 19th century, people have begun the research of fingerprint on scientific meaning.Dr.HenryFaulds (1843-1930), the people who is engaged in Study on Fingerprint in the world the earliest is the great master of first publication of the whole world " dactylography "; He has proved the theory of " fingerprint is unchangeable " that Ao Keer (Welker) proposed in 1856, starts that fingerprint manifestation is applied to the scene of a crime evaluation.1877, Charles Robert Richet Aubert manifested the fingerprint manifestation technology having founded silver nitrate.Laten fingerprints is sightless, but clear up a criminal case is had great significance, and existing many advanced technologies are applied to fingerprint manifestation.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 suspension amount in air of granularity is just big more 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.The employing nano material is carried out fingerprint manifestation and is strengthened the incipient stage that is in research at present, the Sodhi of India Univ Delhi has synthesized a kind of nano fluorescent powder of alundum (Al, be used to manifest multiple object surfaces such as white and colour fingerprint, to body surface more suitable (Soshi.G.S, Kaur.J.Nanoparticles Size Fingerprint Dusting Conpostion Basedon Fluorescent Eosin Y Dye.Fingerprint Whorld 2006.32.146-147.) smooth and moist and that have viscosity.People such as Menzel utilize dendron shaped polymer and cadmium sulfide synthesis of nano multipolymer, dendron shaped polymer surface has amino or hydroxy functional group, can interact with residual organic on the fingerprint ridge, cause the quantum dot gathering and show fingerprint (Menzel E.R, Takatsu M.et al.PhotoluminescentCdS/dendrimer nanocomposites for fingerprint detection Journal of ForensicSciences, 2000,45,770-773).Choi has synthesized the nm of gold material of oleyl amine modification and the titanium dioxide nano material that fluorescent dye is modified.Process for show is with conventional powder method (Choi M J, McDonagh R M.Preparation and Evaluation of Metal Nanopowders for theDetection of fingerprint on Nonporous surfaces.J.Forensic Identification2006.56.756-758).The pattern that the present invention has adopted immersion to manifest has reduced the weakness that nano material suspends in air, reduce the possibility to the harm that manifests personnel.
Summary of the invention
The purpose of this invention is to provide a kind of developing latent finger prints using method that adopts the gold nano-material enhancing in non-permeating objects, be specifically related to a kind of developing latent finger prints using method that adopts the gold nano-material enhancing of sodium citrate and tannic acid modification in non-permeating objects.This method is highly sensitive, and is fast, simple.After fingerprint manifestation finished, it was fixing directly to take pictures, and evaluation compares.
The invention provides a kind of developing latent finger prints using method that adopts the gold nano-material enhancing in non-permeating objects, golden nanometer particle is adsorbed on the fingerprint ridge that is retained in the object surface by electrostatic attraction, and catalysis silver separates out gathering, absorbs visible light, manifests thereby reach laten fingerprints strengthened.
The preparation of golden nanometer particle: with the chlorauric acid solution heated and stirred to the boiling after, add sodium citrate and tannic acid solution, continue boiling 10min～20min, stop heating and be cooled to room temperature, wherein, gold chloride: sodium citrate: the tannic acid amount of substance is than being 1:(8～15): (0.008～0.015), in above-mentioned solution, add gold chloride and polysorbas20 or polysorbate40, wherein, the gold chloride amount of substance: the volume mL of polysorbas20 or polysorbate40 is than being 1:(0.45～0.80), stir after 15min～30min, transfer pH=2.4～2.8 with citric acid solution, room temperature is placed stand-by;
The fingerprint manifestation method: at room temperature, object to be measured is immersed in the gold nano solution, soak time is to take out behind 15min～120min, uses distilled water flushing, to remove the golden nanometer particle that does not have absorption; The citric acid-sodium citrate buffer of preparation pH=3.6～3.9, with mass ratio is that the silver acetate and the p-dihydroxy-benzene of 1:2.3～2.8 is dissolved in the citric acid solution, to be put into this mixed liquor by apparent object and soak 5min～30min, take out, use distilled water flushing, put into stop bath and soak 3min～9min, take out, with the tap water flushing, obtain fingerprint image clearly.
Beneficial effect; This method is simple, and is with low cost, and synthetic gold nano solution can long preservation, repeatedly uses, and does not need the auxiliary of complex instrument, can clearly see the lip-deep laten fingerprints streakline of multiple object under visible light.This method environmental friendliness, whole process is finished at aqueous phase, to operating personnel without any actual bodily harm.
Description of drawings
Fig. 1 is the fingerprint image that displays on glass.
Fig. 2 displays fingerprint image on the aluminium foil.
Fig. 3 displays fingerprint image on the green plastic.
Fig. 4 displays fingerprint image on the plank.
Embodiment
Embodiment 1:
Preparation gold nano solution: with 50ml concentration is the HAuCl of 0.1mmol/L
4Solution, heated and stirred add the mixed solution of the tannic acid of sodium citrate that 30ml concentration is 1.33mmol/L and 0.0025mmol/L afterwards to boiling, continue boiling 15 minutes, are cooled to room temperature.Add the 25ul polysorbas20 in above-mentioned solution, fully stir, transferring pH with citric acid solution is 2.4.Object glass to be measured is immersed gold nano solution soak, soak 5min, take out and use distilled water flushing, remove the golden nanometer particle that does not have absorption.
Fingerprint manifestation: the citric acid-sodium citrate buffer 50ml of preparation pH=3.8.Get the 75mg silver acetate, the p-dihydroxy-benzene of 210mg is dissolved in the buffer solution.To wait to show object glass puts into above-mentioned solution and soaks 10min.Take out, use distilled water flushing, remove unnecessary silver salt, put into stop bath and soak 4min, take out, wash with tap water.Can see fingerprint image clearly.(accompanying drawing 1)
Embodiment 2:
Preparation gold nano solution: with 50ml concentration is the HAuCl of 0.14mmol/L
4Solution is heated to boiling, stirs after adding the mixed solution of tannic acid of sodium citrate that 30ml concentration is 3.5mmol/L and 0.0019mmol/L, continues boiling 10 minutes, is cooled to room temperature.Add the 30ul polysorbas20 in above-mentioned solution, fully stir, transferring pH with citric acid solution afterwards is 2.5.Object aluminium foil to be measured is immersed gold nano solution soak, soak 13min, take out and use distilled water flushing, remove the golden nanometer particle that does not have absorption.
Fingerprint manifestation: the citric acid-sodium citrate buffer 50ml of preparation pH=3.6.Get the 75mg silver acetate, the p-dihydroxy-benzene of 250mg is dissolved in the 50ml citric acid solution.To wait to show object tinfoil puts into mixed liquor and soaks 15min.Take out, use distilled water flushing, remove unnecessary silver salt, put into stop bath and soak 6min, take out, wash with tap water.Can see fingerprint image clearly.(accompanying drawing 2)
Embodiment 3:
Preparation gold nano solution: with 50ml concentration is the HAuCl of 0.6mmol/L
4Solution is heated to boiling, stirs after adding the tannic acid mixed solution of sodium citrate that 30ml concentration is 10.0mmol/L and 0.0012mmol/L, continues boiling 13min, stops heating and is cooled to room temperature.Add the 25ul polysorbate40 in above-mentioned solution, stir after the 18min, transferring to pH with citric acid solution is 2.6.Object plastics to be measured are immersed in the gold nano solution, soak 60min, take out and use distilled water flushing, remove the golden nanometer particle that does not have absorption.
Fingerprint manifestation: the citric acid-sodium citrate buffer 50ml of preparation pH=3.8.Get the 80mg silver acetate, the p-dihydroxy-benzene of 220mg is dissolved in the buffer solution, afterwards two kinds of solution is mixed.To wait to show the object plastics puts into mixed liquor and soaks 15min.Take out, use distilled water flushing, remove unnecessary silver salt, put into stop bath and soak 4min, take out, wash with tap water.Can see fingerprint image clearly.(accompanying drawing 3)
Embodiment 4:
Preparation gold nano solution: with 50ml concentration is the HAuCl of 0.3mmol/L
4Solution is heated to boiling, stirs after adding the tannic acid mixed solution of sodium citrate that 30ml concentration is 11.0mmol/L and 0.0015mmol/L, continues boiling 20 minutes, is cooled to room temperature.Add the 44ul polysorbas20 in above-mentioned solution, fully stir, transferring pH with citric acid solution afterwards is 2.8.Object wood chip to be measured is immersed gold nano solution soak, soak 120min, take out and use distilled water flushing, remove the golden nanometer particle that does not have absorption.
Fingerprint manifestation: the citric acid-sodium citrate buffer 50ml of preparation pH=3.9.The p-dihydroxy-benzene of getting 100mg silver acetate 350mg is dissolved in the citric acid solution.To wait to show the object wood chip puts into mixed liquor and soaks 20min.Take out, use distilled water flushing, remove unnecessary silver salt, put into stop bath and soak 9min, take out, wash with tap water.Can see fingerprint image clearly.(accompanying drawing 4)
Claims (1)
1, a kind of developing latent finger prints using method that adopts the gold nano-material enhancing in non-permeating objects is characterized in that step and condition are as follows:
The preparation of golden nanometer particle: with the chlorauric acid solution heated and stirred to the boiling after, add sodium citrate and tannic acid solution, continue boiling 10min～20min, stop heating and be cooled to room temperature, wherein, gold chloride: sodium citrate: the tannic acid amount of substance is than being 1:8～15:0.008～0.015, in above-mentioned solution, add gold chloride and polysorbas20 or polysorbate40, wherein, the gold chloride amount of substance: the volume mL of polysorbas20 or polysorbate40 is than being 1:0.45～0.80, stir after 15min～30min, transfer pH=2.4～2.8 with citric acid solution, room temperature is placed stand-by;
The fingerprint manifestation method: at room temperature, object to be measured is immersed in the gold nano solution, soak time is to take out behind 15min～120min, uses distilled water flushing, to remove the golden nanometer particle that does not have absorption; The citric acid-sodium citrate buffer of preparation pH=3.6～3.9, with mass ratio is that the silver acetate and the p-dihydroxy-benzene of 1:2.3～2.8 is dissolved in the citric acid solution, to be put into this mixed liquor by apparent object and soak 5min～30min, take out, use distilled water flushing, put into stop bath and soak 3min～9min, take out, with the tap water flushing, obtain fingerprint image clearly.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100516912A CN101446557A (en) | 2008-12-29 | 2008-12-29 | Method for strengthening latent fingerprint observation on non-permeating object by adopting gold nano-material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101703404B (en) * | 2009-08-28 | 2012-01-11 | 东北师范大学 | Method for showing fingerprints on various object surfaces and keeping DNA information |
| CN105615892A (en) * | 2014-10-31 | 2016-06-01 | 青岛农业大学 | Novel silver development reagent for latent fingerprint development and preparation process of silver development reagent |
| 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 |
-
2008
- 2008-12-29 CN CNA2008100516912A patent/CN101446557A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101703404B (en) * | 2009-08-28 | 2012-01-11 | 东北师范大学 | Method for showing fingerprints on various object surfaces and keeping DNA information |
| CN105615892A (en) * | 2014-10-31 | 2016-06-01 | 青岛农业大学 | Novel silver development reagent for latent fingerprint development and preparation process of silver development reagent |
| CN105615892B (en) * | 2014-10-31 | 2018-09-21 | 青岛农业大学 | A kind of novel silver for developing latent finger printss shows reagent and its preparation process |
| 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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Open date: 20090603 |