CN101697873A - Method for developing latent fingerprints by adopting nano zinc oxide - Google Patents
Method for developing latent fingerprints by adopting nano zinc oxide Download PDFInfo
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- CN101697873A CN101697873A CN200910235294A CN200910235294A CN101697873A CN 101697873 A CN101697873 A CN 101697873A CN 200910235294 A CN200910235294 A CN 200910235294A CN 200910235294 A CN200910235294 A CN 200910235294A CN 101697873 A CN101697873 A CN 101697873A
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Abstract
The invention relates to a method for developing latent fingerprints by adopting nano zinc oxide, and belongs to the technical field of fingerprint identification. In the method, nano zinc oxide powder is taken as a fluorescence carrier, and develops the fingerprints by utilizing photoluminescence performance of the nano powder. The method comprises the following steps: preparing the nano zinc oxide powder from raw materials of zinc acetate and lithium hydroxide; putting the prepared nano zinc oxide powder into deionized water, and then adding a stabilizer Tween 20 to prepare nano zinc oxide suspension; putting a fingerprint material into the nano zinc oxide suspension; and soaking, developing, cleaning, and observing a fluorescence fingerprint under the radiation of ultraviolet. The nano fluorescence material obtained has strong fluorescent property and high capacity of combining fingerprint residues. The development method has simple and convenient operation, and sanitation and environmental protection; and the nano zinc oxide has ideal development efficiency, sensitivity, accuracy and repeatability. The method can perform high-efficiency, accurate and quick development.
Description
Technical field
The invention belongs to impression of the hand authentication technique field, particularly nano zine oxide ultraviolet-visible luminescence generated by light manifests the method for latent fingerprint.
Background technology
Impression of the hand is the skin pattern of staff, comprises mastoid process decorative pattern (finger stricture of vagina, dactylus stricture of vagina and palmmprint), musculus flexor pleat stricture of vagina, wrinkle and the scar etc. of palmar aspect.It is the most general a kind of personal recognition methods and the evidence form used in the present worldwide, and it is all playing the part of important role in the investigation and the trial process of many cases.So far, there is not a kind of method can substitute its overall characteristic such as accurate, safe, easy fully.
In fingerprint displaying 100 years of development histories, photoluminescence method is a kind of novel fingerprint displaying method that nearly 20 years development are got up.Because it has significant advantages such as cost is low, safe, selective power is strong, fluorescence is good, so quite be subjected to forensic science staff's favor.At present, this method is mainly utilized traditional organic fluorescent dye that the latent fingerprint that latent fingerprint or " 502 " are smoked after showing is manifested or strengthens to manifest, as rhodamine 6G, Gentian Violet, methyl blue etc.What their weak point was that fluorescence property (fluorescence intensity, fluorescence lifetime, bleach-resistant ability, stoke shift etc.) can't satisfy outmoded impression of the hand sometimes manifests requirement, strong with selective binding ability, the toxic of impression of the hand residue.In the middle of the practice, tend to produce that unintelligible, the false feature of the streakline that manifests is many, contrast is little, to adverse consequencess such as the operator ' s health danger side of body are big.
Though the someone proposes to use photoluminescence method binding time resolution imaging technology that some special object surface latent fingerprint is manifested in recent years, to evade the interference of background fluorescence to the luminous result of manifesting of light; But the required condition harshness of this method, complicated operation, cost are higher, are difficult to popularize.
In addition, in the fingerprint displaying technology, the effect that nanotechnology and associated materials are played the part of is more and more important.Cadmium sulfide, cadmium telluride and cadmium selenide/novel nano fluorescent materials such as zinc sulfide nucleocapsid structure that dendrimer coats successively are introduced into the field of potential fingerprint displaying.They all are a kind of fluorescent materials that extensively apply to fields such as biological fluorescent labeling, biochip at present, when size is reduced to nanoscale, its internal electron, hole number sharply reduce, band structure can become discrete energy level by band by quasi-continuous, so the optical transition spectral line of material narrows, the interaction of blue shift, ambient light and material itself is more strong.Compare advantages such as this class fluorescent material has the exciting light spectrum width, emission spectra is narrow, stoke shift is big, emission wavelength position-controllable with traditional fluorescent dye.
Because the powerful advantages of fluorescence property aspect, this class material becomes the main development trend of potential fingerprint displaying method, so far, successively the nano-luminescent material that occurs has Nano cadmium sulphide, the nanometer cadmium selenide, the nano material of nanometer cadmium telluride and other nucleocapsid structure, but also have the further solution of some problem needs in evolution: novel to manifest the reagent preparation cost higher such as some, complicated operation, the reagent stability shortcoming, poor with impression of the hand residue selective binding, manifest consuming time longer, the readability of streakline and minutia are covered easily, still there is hidden danger in reagent safety.
Zinc oxide, zinc sulfide are two kinds of typical II B-VIA compounds of group, and they are the direct band-gap semicondictor material of broad stopband, are that a kind of safer no cadmium manifests reagent, can fundamentally solve pollution and harm that cadmium ion causes.But, common zinc oxide suspension, the scope of application is narrow, and imaging pattern is single, can only be under natural light, be used for manifesting of impression of the hand on the dark object, and the impression of the hand that shows is clear inadequately, is difficult to show minutia.The nano zine oxide that the present invention adopts, use the object wide ranges, imaging pattern is various, both can be under natural light, and the light colour that utilizes self is with forming tangible contrast and imaging between the dark object, also can be under the irradiation under ultraviolet ray of broad wave-length coverage, utilize visible fluorescence imaging with the tangible contrast of formation between the light object, and, the impression of the hand streakline smoothness of showing, minutia is clear, has broken the traditional method that light reagent can not manifest light object impression of the hand.
Summary of the invention
The objective of the invention is to propose a kind of method that adopts nano zine oxide to manifest latent fingerprint for overcoming the weak point of prior art, the inventive method is easy and simple to handle, health environment-friendly, and it is all more satisfactory that it manifests efficient, sensitivity, accuracy and repeatability.
The present invention proposes a kind of method that adopts nano zine oxide to manifest latent fingerprint, it is characterized in that, and be fluorescence carrier with the nano zine oxide powder, utilize the photoluminescence performance of this nano material, impression of the hand is manifested.
This method specifically may further comprise the steps:
1) is raw material with zinc acetate, Lithium hydrate, makes zinc oxide nano powder;
2) zinc oxide nano powder, deionized water, the stabilizer T ween 20 that consumption is respectively 0.05～0.2g, 25～100mL, 0.13～0.5mL mixes, and makes nano zinc oxide suspension;
3) the impression of the hand sample is placed nano zinc oxide suspension; , cleaning apparent through soaking under irradiation under ultraviolet ray, are observed the fluorescence impression of the hand.
Above-mentioned steps 1) specifically can may further comprise the steps:
11) under the normal pressure, in the ebullient ethanol of 25～100mL, add 0.55～2.20g zinc acetate, and place mixture of ice and water to cool off in the gained mixture under the magnetic agitation condition, obtain solution 1;
12) in another container, 0.15～0.58g Lithium hydrate is dissolved in 25～100mL ethanol, behind ultrasonic 10～30min, place mixture of ice and water to cool off, obtain solution 2;
13) be under 1000～1200rpm stirring condition at-1 ℃～1 ℃ and rotating speed, solution 1 slowly dropped in the solution 2, to mixed solution be clear state, the mixed solution with clear state places 4 ℃ to preserve down then;
(14) with the mixed solution of above-mentioned clear state with 3000～4000rpm rotating speed rotating centrifugal, obtain the nano zine oxide powder.
Above-mentioned steps 2) specifically can may further comprise the steps:
21) take by weighing 0.05～0.2g nano zine oxide powder, it is added in 25～100mL deionized water, obtain small-particle suspension;
22) in above-mentioned suspension, add 0.13～0.5mL Tween 20; Under the room temperature, ultrasonic 10～30min is to the nano-particle homodisperse.
Above-mentioned steps 3) specifically can comprise:
31) the impression of the hand sample is placed nano zinc oxide suspension at room temperature soak and show 10～20min, manifest in the process,, latent fingerprint is manifested with 100～300 times/minute the frequencies impression of the hand sample that vibrates in the horizontal direction;
32) after latent fingerprint manifests, use deionized water rinsing impression of the hand sample 0.5～3min, dry under the naturalness, in 300～400nm scope, under the irradiation under ultraviolet ray, observe the fluorescence impression of the hand.
The inventive method also can comprise:
4) the impression of the hand sample is placed the darkroom, long wave ultraviolet light excites down in 300～400nm scope, takes into the impression of the hand image.
Above-mentioned impression of the hand sample comprises any tablet among glass, plastics, tinfoil, pop can, ceramic tile or the plastics.
The present invention has the following advantages:
This method is utilized nano zinc oxide suspension that latent fingerprint is carried out room temperature to soak apparent fast, both kept existing physics appearance method higher manifest efficient, remedied the weak point of existing physics appearance method again, and accomplished safety, environmental protection for streakline details, streakline edge, three grades of characteristic aspect presentation capabilities.
The luminescence generated by light of this method manifests that reagent preparation technology is simple, and production cost is lower, is suitable for producing in enormous quantities; It is easy to manifest process, is easy to popularize; The employed imaging technique of this method is a general ultraviolet fluorescence imaging technology, and simple to operate, job costs are low, and the instrument good portability need not extras.
The nano-luminescent material that is obtained by the present invention has stronger fluorescence property and the higher ability in conjunction with the finger mark residue, is not less than even surpasses at present such object surface fingerprint displaying technology in the world for the presentation capability of surperficial impressions of the hand such as ceramic tile, tinfoil, plastics, metal.
Description of drawings
Fig. 1 is a nano zinc oxide suspension emitting fluorescence design sketch under irradiation under ultraviolet ray; The left side is a deionized water; The right is a nano zinc oxide suspension;
Fig. 2 manifests tinfoil surface green oil latent design sketch for the nano zinc oxide suspension of the embodiment one of employing the inventive method; A is a shooting effect under the rayed of chamber; B is a shooting effect under the irradiation under ultraviolet ray.
The specific embodiment
Further specify the present invention below in conjunction with embodiment, these embodiment only are used for explanation, and do not limit practical ranges of the present invention.
The present invention adopts nano zine oxide to manifest the embodiment of the method for latent fingerprint, may further comprise the steps:
1) is raw material with zinc acetate, Lithium hydrate, makes the nano zine oxide powder;
(11) under the normal pressure, in the ebullient ethanol of 25～100mL, add 0.55～2.20g zinc acetate, and place mixture of ice and water to cool off in the gained mixture under the magnetic agitation condition, obtain solution 1;
(12) in another container, 0.15～0.58g Lithium hydrate is dissolved in 25～100mL ethanol, behind ultrasonic 10～30min, place mixture of ice and water to cool off, obtain solution 2;
(13) be under 1000～1200rpm stirring condition at-1 ℃～1 ℃ and rotating speed, solution 1 slowly dropped in the solution 2, to mixed solution be clear state, the mixed solution with clear state places 4 ℃ to preserve down then;
(14) with the mixed solution of above-mentioned clear state with 3000～4000rpm rotating speed rotating centrifugal, obtain the nano zine oxide powder;
2) be stabilizing agent with Tween 20, make nano zinc oxide suspension;
(21) take by weighing 0.05～0.2g nano zine oxide powder, it is added in 25～100mL deionized water, obtain small-particle suspension;
(22) in above-mentioned suspension, add 0.13～0.5mL Tween 20; Under the room temperature, ultrasonic 10～30min to nanometer granule homodisperse, makes nano zinc oxide suspension.
Fig. 1 is a nano zinc oxide suspension emitting fluorescence effect under the irradiation under ultraviolet ray; The left side is a deionized water among the figure, and the right side is the nano zine oxide small-particle suspension.
3) latent fingerprint sample to be measured is placed nano zinc oxide suspension; , cleaning apparent through soaking, under irradiation under ultraviolet ray, observe the fluorescence impression of the hand:
31) latent fingerprint sample to be measured is placed nano zinc oxide suspension at room temperature soak and show 10～20min, manifest in the process,, latent is manifested with 100～300 times/minute the frequencies impression of the hand sample that vibrates in the horizontal direction;
32) after latent fingerprint manifests, use deionized water rinsing impression of the hand sample 0.5～3min, dry under the naturalness, under 300～400nm irradiation under ultraviolet ray, observe the fluorescence impression of the hand.
Fig. 2 manifests tinfoil surface green oil latent fingerprint design sketch for the nano zinc oxide suspension of the embodiment one of employing the inventive method.The left side is the fingerprint displaying design sketch under the sun exposure among the figure, and the right side is the fingerprint displaying design sketch under the 365nm irradiation under ultraviolet ray.
Impression of the hand sample in the present embodiment can comprise any tablet among glass, plastics, tinfoil, pop can or the ceramic tile.
Present embodiment also can comprise:
4) the impression of the hand sample is placed the darkroom, long wave ultraviolet light excites down in 300～400nm scope, takes into the impression of the hand image.
Claims (6)
1. a method that adopts nano zine oxide to manifest latent fingerprint is characterized in that, is fluorescence carrier with the nano zine oxide powder, utilizes the photoluminescence performance of this nanometer powder, and impression of the hand is manifested; Specifically may further comprise the steps:
1) is raw material with zinc acetate, Lithium hydrate, makes the nano zine oxide powder;
2) nano zine oxide powder, deionized water, the stabilizer T ween 20 that consumption is respectively 0.05～0.2g, 25～100mL, 0.13～0.5mL mixes, and makes nano zinc oxide suspension;
3) the impression of the hand sample is placed nano zinc oxide suspension; , cleaning apparent through soaking under irradiation under ultraviolet ray, are observed the fluorescence impression of the hand.
2. method according to claim 1 is characterized in that: described step 1) specifically comprises:
11) under normal pressure, in the ebullient ethanol of 25～100mL, add 0.55～2.20g zinc acetate, and under the magnetic agitation condition, place mixture of ice and water to cool off in the gained mixture, obtain solution 1;
12) in another container, 0.15～0.58g Lithium hydrate is dissolved in 25～100mL ethanol, behind ultrasonic 10～30min, place mixture of ice and water to cool off, obtain solution 2;
13) be under 1000～1200rpm stirring condition at-1 ℃～1 ℃ and rotating speed, solution 1 slowly dropped in the solution 2, to mixed solution be clear state, the mixed solution with clear state places 4 ℃ to preserve down then;
(14) with the mixed solution of above-mentioned clear state with 3000～4000rpm rotating speed rotating centrifugal, obtain the nano zine oxide powder.
3. method according to claim 1 is characterized in that: described step 2) specifically comprise:
21) take by weighing 0.05～0.2g nano zine oxide powder, it is added in 25～100mL deionized water, obtain small-particle suspension;
22) in above-mentioned suspension, add 0.13～0.5mL Tween 20; Under the room temperature, ultrasonic 10～30min to the nano-particle homodisperse, makes nano zinc oxide suspension.
4. method according to claim 1 is characterized in that: described step 3) specifically comprises:
31) the impression of the hand sample is placed nano zinc oxide suspension, at room temperature soak and show 10～20min, manifest in the process,, potential finger mark is manifested with 100～300 times/minute the frequencies impression of the hand sample that vibrates in the horizontal direction;
32) after latent fingerprint manifests, use deionized water rinsing impression of the hand sample 0.5～3min, dry under the naturalness, in 300～400nm scope, under the irradiation under ultraviolet ray, observe the fluorescence impression of the hand.
5. method according to claim 1 is characterized in that: also comprise:
4) the impression of the hand sample is placed the darkroom, under 300～400nm scope ultraviolet excitation, take into the impression of the hand image.
6. as method as described in claim 1 or 4, it is characterized in that the impression of the hand sample in the described step 3) comprises any tablet among glass, plastics, tinfoil, pop can or the ceramic tile.
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| CN200910235294A CN101697873A (en) | 2009-09-30 | 2009-09-30 | Method for developing latent fingerprints by adopting nano zinc oxide |
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| CN200910235294A CN101697873A (en) | 2009-09-30 | 2009-09-30 | Method for developing latent fingerprints by adopting nano zinc oxide |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104783806A (en) * | 2015-05-05 | 2015-07-22 | 哈尔滨师范大学 | Method for displaying latent fingerprints through fluorescent copper sol |
| CN104894252A (en) * | 2015-05-28 | 2015-09-09 | 公安海警学院 | Recognition method for biological individual identity |
| CN105796113A (en) * | 2016-03-08 | 2016-07-27 | 沈阳大学 | Fingerprint detection method based on carbon nanoparticles as fluorescence indicator |
| RU2694417C1 (en) * | 2018-07-16 | 2019-07-12 | Галина Константиновна Лобачева | Method of finding and detecting hand traces on metal and other non-porous surfaces |
-
2009
- 2009-09-30 CN CN200910235294A patent/CN101697873A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104783806A (en) * | 2015-05-05 | 2015-07-22 | 哈尔滨师范大学 | Method for displaying latent fingerprints through fluorescent copper sol |
| CN104783806B (en) * | 2015-05-05 | 2017-06-30 | 哈尔滨师范大学 | A kind of method that fluorescence copper colloidal sol is used for developing latent finger printss |
| CN104894252A (en) * | 2015-05-28 | 2015-09-09 | 公安海警学院 | Recognition method for biological individual identity |
| CN105796113A (en) * | 2016-03-08 | 2016-07-27 | 沈阳大学 | Fingerprint detection method based on carbon nanoparticles as fluorescence indicator |
| CN105796113B (en) * | 2016-03-08 | 2018-08-03 | 沈阳大学 | A kind of base carbon nano-particles are the fingerprint detection method of fluorescent marker |
| RU2694417C1 (en) * | 2018-07-16 | 2019-07-12 | Галина Константиновна Лобачева | Method of finding and detecting hand traces on metal and other non-porous surfaces |
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Open date: 20100428 |