CN105796113A - Fingerprint detection method based on carbon nanoparticles as fluorescence indicator - Google Patents
Fingerprint detection method based on carbon nanoparticles as fluorescence indicator Download PDFInfo
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- CN105796113A CN105796113A CN201610129297.0A CN201610129297A CN105796113A CN 105796113 A CN105796113 A CN 105796113A CN 201610129297 A CN201610129297 A CN 201610129297A CN 105796113 A CN105796113 A CN 105796113A
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- 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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Abstract
The invention discloses a fingerprint detection method based on carbon nanoparticles as a fluorescence indicator, and relates to a fingerprint detection method. The method comprises the steps that non-viscous fluorescence carbon nanoparticles and nanostarch are combined according to the mass ratio being 0.1% to form nano fluorescence starch; the starch and carbon nanoparticle composite is dried for fingerprint detection. The fingerprint shown through the powder has fluorescence property, has the good light emitting property under a 365 nm ultraviolet lamp, and can be photographed into a picture; the powder has the fluorescence property under irradiation of other wavelengths, and can be photographed into a picture after filtered through an optical filter; the powder also has good upconversion fluorescence radiation under irradiation of infrared light, and clear imaging is achieved through filtering. The adopted materials are wide in source, the synthesis method is simple, needed equipment is low in price, the detection speed is high, the fluorescence starch is stable in property and can be stored for a long time, the light emitting strength is high, the wavelength is adjustable, and interference of a fluorescence dye background and a colored background can be effectively avoided.
Description
Technical field
The present invention relates to a kind of fingerprint detection method, particularly relating to a kind of base carbon nano-particles is the fingerprint detection method of fluorescent marker.
Background technology
Fingerprint has consequence as the important material evidence of scene of a crime in criminal investigation field.Fingerprint is divided into several types, as: blood fingerprint, antiperspirant impression of the hand.Antiperspirant impression of the hand is difficult to direct detection, is generally developed.In fingerprint technique, the problem of most critical is the appearing technique of latent fingerprint.Appearing Techniques of Human Fingerprints is developed so far existing century-old history, not only occur in that method conventional in brush dust method, actual case inspection such as smoked aobvious method, ninhydrin method etc., and advanced analysis and detection technology is used for fingerprint detection by a lot of researchers in the last few years, as: fluorescence method.Fluorescent method makes to be combined fluorescent marker with fingerprint, makes fingerprint send fluorescence under uviol lamp, is greatly improved the sensitivity of detection.Fluorescent method divides fluorescent dye determination, quantum dot method etc..Fluorescent dye method is to be combined by the powder of fluorescent dye with traditional powder method, measures fingerprint by powder method.The method has the disadvantage that fluorescent dye price is higher, has carcinogenesis.Quantum dot method carries out fingerprint detection mainly by the fluorescent characteristic of quantum dot, by utilizing quantum dot solution to make print development；Or utilizing the nano-complex powder of quantum dot, adopt powder method to test, the method is highly sensitive, but quantum dot has stronger toxicity, cannot avoiding of problem of environmental pollution, the healthy of professional and technical personnel can be caused serious harm simultaneously.
Fluorescent carbon nano-particles is also a kind of nano material, and its fluorescence property can match in excellence or beauty with quantum dot.Owing to it is nontoxic, environmental friendliness, transmitting and the adjustable and outstanding upper conversion function of excitating performance be increasingly subject to the attention of scientific circles.But the fluorescence of fluorescent carbon nano-particles can only send at solution state, dried carbon nano-particles fluorescence is wholly absent, because carbon nano-particles there occurs reunion in dry conditions, fluorescent carbon nano-particles may not apply to fingerprint detection.But fluorescent carbon nano-particles can keep with some polyalcohols and natural materials compound tense solid fluorescence, as carbon nano-particles and Polyethylene Glycol compound can have good solid fluorescence, but Polyethylene Glycol is difficult to prepare into powder, complex thickness, it is difficult to form granule.The present invention utilizes its this feature by carbon nano-particles and native starch compound and to be applied to fingerprint detection.The present invention has that testing cost is cheap, testing staff and environment are not poisoned, detection method is simple, rapid advantage, is the succedaneum of cadmium sulfide, powder of cadmium selenide quanta dots method.In addition the exciting and launch Wavelength tunable of fluorescence starch, it is possible to avoid the interference such as the detection fluorescent dye on object surface, colored background, substantially increase scope and the sensitivity of detection.
Summary of the invention
It is an object of the invention to provide a kind of base carbon nano-particles is the fingerprint detection method of fluorescent marker, the method, by a kind of fingerprint fluorescent detection method being luminous marker with carbon nano-particles, solves the problems such as carbon nano-particles dried not luminous, quantum dot nano particle is poisonous, oxidizable, fluorescent dye colored background interference.By adjusting excitation wavelength, it is possible to be effectively improved detection sensitivity.
It is an object of the invention to be achieved through the following technical solutions:
A kind of base carbon nano-particles is the fingerprint detection method of fluorescent marker, and described method includes procedure below: non-thick carbon nano-particles and nano-starch being added solvent acetone and carries out simple ultrasonic agitation so as to compound, the starch after compound is fluorescence starch；Using nano fluorescent starch as label, powder brush method manifests latent property fingerprint, imaging of taking pictures under excitation source,；
Specifically comprise the following steps that
1) preparation of fluorescence starch: negated viscous thick solid carbon nano-particles 0.1 gram mixes addition water and 50 milliliters of acetone with 100 grams of nano-starch, proceed in surface plate, it is placed on ultrasonic cleaner and stirs 30 minutes, natural drying one day, it is subsequently placed in exsiccator dry 3 days, obtaining faint yellow starch powder, gained starch has fluorescence, for fluorescence starch；
2) detection of fingerprint: fingerprint provider washes one's hands with soap three times, naturally dries；Rub gently at forehead with finger, object is restrained impression of the hand；Take above-mentioned fluorescence starch, be distributed in fingerprint surface, in the visible starch attachment of finger-print region, blow away unnecessary starch gently with ear washing bulb；Fluorescence starch fingerprint latent image is placed under radiation source, imaging of taking pictures；Under 365nm uviol lamp, direct imaging is taken pictures, and needs to use filter to remove exciting light, imaging of taking pictures under other wavelength.
Described a kind of base carbon nano-particles is the fingerprint detection method of fluorescent marker, and described fluorescence starch is shiner.
Described a kind of base carbon nano-particles is the fingerprint detection method of fluorescent marker, and described fluorescence starch is fluorescent marker.
Described a kind of base carbon nano-particles is the fingerprint detection method of fluorescent marker, and described using fluorescence starch as label, powder brush method manifests latent property fingerprint, imaging of taking pictures under excitation source.
Described a kind of base carbon nano-particles is the fingerprint detection method of fluorescent marker, and described excitation source produces fluorescence at 320-900 nanometer.
Advantages of the present invention and effect be:
The method, by a kind of fingerprint fluorescent detection method being luminous marker with carbon nano-particles, solves the problems such as carbon nano-particles dried not luminous, quantum dot nano particle is poisonous, oxidizable, fluorescent dye colored background interference.By adjusting excitation wavelength, it is possible to be effectively improved detection sensitivity.
Accompanying drawing explanation
The latent property fingerprint that Fig. 1 is glass surface uses fluorescence starch development fluorescence photo (corresponding embodiment 1)；I.e. fingerprint fluorescent photo under 365 nanometers of uviol lamps；
The latent property fingerprint that Fig. 2 is poster paper surface uses fluorescence starch development up-conversion fluorescence photo (corresponding embodiment 2)；I.e. fingerprint fluorescent photo under 2850 nanometers of infrared lights.
Detailed description of the invention
Below in conjunction with accompanying drawing illustrated embodiment, the present invention is described in detail.
The fingerprint detection method that the present invention is fluorescent marker with a kind of base carbon nano-particles.Being mixed by the mass ratio of 0.1% with nano-starch by non-thick carbon nano-particles, add a small amount of water and solvent acetone carries out simple ultrasonic agitation so as to compound, the starch drying after compound becomes fluorescence starch.Using nano fluorescent starch as label, powder brush method manifests latent property fingerprint, imaging of taking pictures under excitation source.
For technical scheme is better described, spy provides following example, but the enforcement of the present invention is not limited to that.
Embodiment 1
1) preparation of fluorescence starch: negated viscous thick solid carbon nano-particles 0.1 gram mixes a small amount of water of addition and 50 milliliters of acetone with 100 grams of nano-starch, proceed in surface plate, it is placed on ultrasonic cleaner and stirs 30 minutes, natural drying one day, it is subsequently placed in exsiccator dry 3 days, obtaining faint yellow starch powder, gained starch has fluorescence, for fluorescence starch.
2) detection of fingerprint: fingerprint provider washes one's hands with soap three times, naturally dries.Rub gently at forehead with finger, object is restrained impression of the hand.Take above-mentioned fluorescence starch, be distributed in fingerprint surface, in the visible starch attachment of finger-print region, blow away unnecessary starch gently with ear washing bulb.Fluorescence starch fingerprint latent image is placed under radiation source, imaging of taking pictures.Under 365nm uviol lamp, direct imaging is taken pictures, and fingerprint is that sapphirine is luminous.This example is suitable for the smooth inorganic thing fingerprint surfaces such as glass, metal, ceramic tile and measures.
Embodiment 2
1) preparation of fluorescence starch: negated viscous thick solid carbon nano-particles 0.1 gram mixes a small amount of water of addition and 50 milliliters of acetone with 100 grams of nano-starch, proceed in surface plate, it is placed on ultrasonic cleaner and stirs 30 minutes, natural drying one day, it is subsequently placed in exsiccator dry 3 days, obtaining faint yellow starch powder, gained starch has fluorescence, for fluorescence starch.
2) detection of fingerprint: fingerprint provider washes one's hands with soap three times, naturally dries.Rub gently at forehead with finger, object is restrained impression of the hand.Take above-mentioned fluorescence starch, be distributed in fingerprint surface, in the visible starch attachment of finger-print region, blow away unnecessary starch gently with ear washing bulb.Fluorescence starch fingerprint latent image is placed under radiation source, imaging of taking pictures.Under 850nm infrared light supply irradiates, taking pictures imaging through 450 nanometers of upper logical light filters, fingerprint is yellow green.The object fingerprint surface that this example is suitable for copy paper, poster paper etc. have intense fluorescence to disturb under 365 nanometers of uviol lamps measures.
Embodiment 3
1) preparation of fluorescence starch: negated viscous thick solid carbon nano-particles 0.1 gram mixes a small amount of water of addition and 50 milliliters of acetone with 100 grams of nano-starch, proceed in surface plate, it is placed on ultrasonic cleaner and stirs 30 minutes, natural drying one day, it is subsequently placed in exsiccator dry 3 days, obtaining faint yellow starch powder, gained starch has fluorescence, for fluorescence starch.
2) detection of fingerprint: fingerprint provider washes one's hands with soap three times, naturally dries.Rub gently at forehead with finger, object is restrained impression of the hand.Take above-mentioned fluorescence starch, be distributed in fingerprint surface, in the visible starch attachment of finger-print region, blow away unnecessary starch gently with ear washing bulb.Fluorescence starch fingerprint latent image is placed under radiation source, imaging of taking pictures.Under 420nm LASER Light Source irradiates, taking pictures imaging through 500 nanometers of upper logical light filters, fingerprint is green.The object fingerprint surface that this example is suitable for plastics, bank note, composite floor board etc. have intense fluorescence to disturb under 365 nanometers of uviol lamps measures, and uses LASER Light Source fingerprint imaging effect more preferably.
Accompanying drawing 1 gives the latent property fingerprint of glass surface and uses fluorescence starch development fluorescence photo, and excitation source is 365 nanometers of uviol lamps.Figure is clear, and details in fingerprint substantially can be distinguished, it was demonstrated that the method has practicality.
Accompanying drawing 2 gives the latent property fingerprint on poster paper surface and uses fluorescence starch development up-conversion fluorescence photo, and excitation source is 850 nanometers of infrared lamps.Owing to there is a large amount of fluorescent agent on poster paper surface, under 365 nanometers of uviol lamps, fingerprint fluorescent development cannot be differentiated with background fluorescence, using 850 nanometers of infrared lamps is excitation source, fluorescent dye does not have luminescence at this wavelength, after 450 nm filter filter, fingerprint graph is clear, details in fingerprint substantially can be distinguished, it was demonstrated that the method anti-interference.
Claims (5)
1. a base carbon nano-particles is the fingerprint detection method of fluorescent marker, it is characterized in that, described method includes procedure below: non-thick carbon nano-particles and nano-starch being added solvent acetone and carries out simple ultrasonic agitation so as to compound, the starch after compound is fluorescence starch；Using nano fluorescent starch as label, powder brush method manifests latent property fingerprint, imaging of taking pictures under excitation source,；
Specifically comprise the following steps that
1) preparation of fluorescence starch: negated viscous thick solid carbon nano-particles 0.1 gram mixes addition water and 50 milliliters of acetone with 100 grams of nano-starch, proceed in surface plate, it is placed on ultrasonic cleaner and stirs 30 minutes, natural drying one day, it is subsequently placed in exsiccator dry 3 days, obtaining faint yellow starch powder, gained starch has fluorescence, for fluorescence starch；
2) detection of fingerprint: fingerprint provider washes one's hands with soap three times, naturally dries；Rub gently at forehead with finger, object is restrained impression of the hand；Take above-mentioned fluorescence starch, be distributed in fingerprint surface, in the visible starch attachment of finger-print region, blow away unnecessary starch gently with ear washing bulb；Fluorescence starch fingerprint latent image is placed under radiation source, imaging of taking pictures；Under 365nm uviol lamp, direct imaging is taken pictures, and needs to use filter to remove exciting light, imaging of taking pictures under other wavelength.
2. a kind of base carbon nano-particles according to claim 1 is the fingerprint detection method of fluorescent marker, it is characterised in that described fluorescence starch is shiner.
3. a kind of base carbon nano-particles according to claim 1 is the fingerprint detection method of fluorescent marker, it is characterised in that described fluorescence starch is fluorescent marker.
4. a kind of base carbon nano-particles according to claim 1 is the fingerprint detection method of fluorescent marker, it is characterised in that described using fluorescence starch as label, powder brush method manifests latent property fingerprint, imaging of taking pictures under excitation source.
5. a kind of base carbon nano-particles according to claim 1 is the fingerprint detection method of fluorescent marker, it is characterised in that described excitation source produces fluorescence at 320-900 nanometer.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106634980A (en) * | 2016-11-23 | 2017-05-10 | 沈阳大学 | Method for preparing and applying latent fingerprint development luminescent nanopowder |
| CN106957644A (en) * | 2017-03-13 | 2017-07-18 | 武汉大学 | A kind of fingerprint detection probe based on long-persistence nano material and preparation method thereof and the application in latent fingerprint detection |
| CN108659836A (en) * | 2018-07-23 | 2018-10-16 | 辽宁大学 | A kind of high quantum production rate nitrogen sulphur codope fluorescent carbon point and its preparation method and application |
| CN109880614A (en) * | 2019-03-16 | 2019-06-14 | 复旦大学 | Carbon dots-starch composite phosphor and preparation method thereof for fingerprint detection of diving |
| CN112280556A (en) * | 2020-11-14 | 2021-01-29 | 西北农林科技大学 | Preparation of phosphate radical responsive carbon quantum dots and application of phosphate radical responsive carbon quantum dots in fingerprint fluorescence identification |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106634980A (en) * | 2016-11-23 | 2017-05-10 | 沈阳大学 | Method for preparing and applying latent fingerprint development luminescent nanopowder |
| CN106634980B (en) * | 2016-11-23 | 2019-12-24 | 沈阳大学 | Preparation and application method of latent fingerprint appearing luminous nano powder |
| CN106957644A (en) * | 2017-03-13 | 2017-07-18 | 武汉大学 | A kind of fingerprint detection probe based on long-persistence nano material and preparation method thereof and the application in latent fingerprint detection |
| CN106957644B (en) * | 2017-03-13 | 2019-03-19 | 武汉大学 | A kind of fingerprint detection probe based on long-persistence nano material and preparation method thereof and the application in latent fingerprint detection |
| CN108659836A (en) * | 2018-07-23 | 2018-10-16 | 辽宁大学 | A kind of high quantum production rate nitrogen sulphur codope fluorescent carbon point and its preparation method and application |
| CN108659836B (en) * | 2018-07-23 | 2021-06-01 | 辽宁大学 | High-quantum-yield nitrogen-sulfur co-doped fluorescent carbon dot and preparation method and application thereof |
| CN109880614A (en) * | 2019-03-16 | 2019-06-14 | 复旦大学 | Carbon dots-starch composite phosphor and preparation method thereof for fingerprint detection of diving |
| CN112280556A (en) * | 2020-11-14 | 2021-01-29 | 西北农林科技大学 | Preparation of phosphate radical responsive carbon quantum dots and application of phosphate radical responsive carbon quantum dots in fingerprint fluorescence identification |
| CN112280556B (en) * | 2020-11-14 | 2022-12-09 | 西北农林科技大学 | Preparation of phosphate radical responsive carbon quantum dots and application of phosphate radical responsive carbon quantum dots in fingerprint fluorescence identification |
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