CN110511024B - MoO based on thermochromism effect3Application of ceramics - Google Patents

MoO based on thermochromism effect3Application of ceramics Download PDF

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CN110511024B
CN110511024B CN201910834686.7A CN201910834686A CN110511024B CN 110511024 B CN110511024 B CN 110511024B CN 201910834686 A CN201910834686 A CN 201910834686A CN 110511024 B CN110511024 B CN 110511024B
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moo
ceramic
fingerprint
heating
identification
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CN110511024A (en
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杨正文
李明骏
邱建备
宋志国
杨勇
周大成
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Kunming University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/495—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1365—Matching; Classification
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9646—Optical properties

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  • Ceramic Engineering (AREA)
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Abstract

The invention relates to a MoO based on a thermochromism effect3The application of ceramic material belongs to the field of fingerprint collecting and identifying technology. The invention adopts MoO with thermochromism effect3The ceramic material realizes the collection and identification of fingerprints when the finger is in the MoO3After the ceramic surface is pressed to leave sweat latent fingerprints, MoO can be obtained by heating at low temperature and preserving heat3The sweat latent fingerprints on the ceramic surface are displayed in a blue obvious fingerprint form, so that fingerprint collection and identification are realized. MoO with thermochromic effect3Firstly, weighing a proper amount of (NH) in the ceramic material4)6Mo7O24·4H2Mixing and grinding O and absolute ethyl alcohol, heating to 100 ℃ in air atmosphere, preserving heat for 1 hour, cooling to room temperature along with the furnace temperature, and pressing into a wafer with the diameter of 18 mm; heating to 500-600 ℃ in air atmosphere, preserving heat for 2 hours, and cooling to room temperature to obtain MoO3A ceramic. Compared with the prior fingerprint acquisition and identification technology, the fingerprint acquisition and identification technology based on the thermochromic effect has the advantages of convenience, good stability, long storage time, high accuracy and the like.

Description

MoO based on thermochromism effect3Application of ceramics
Technical Field
The invention relates to a MoO based on a thermochromism effect3The application of ceramics belongs to the technical field of fingerprint acquisition and identification.
Background
Human body feature collection and identification technologies include many aspects, such as face identification, iris identification, handwriting identification, fingerprint identification, etc., and all utilize unique and fixed physiological and behavioral features of a human body to verify an individual identity, and have been widely applied to the fields of electronic commerce, communication equipment and financial security because of their advantages of safety, uniqueness, convenience, etc. The fingerprint identification is the most convenient biological identification technology, the fingerprint is the uneven skin lines on the human finger, the fingerprint is formed before the birth of the human, importantly, the fingerprint cannot change along with the physiological growth change of the human, the fingerprints of everyone are different, the total characteristic and the local characteristic detail are obviously different, the fingerprints of different people have great difference in the aspects of core points, triangular points, line numbers, curvatures, nodes and the like, and the basis is provided for the fingerprint identification. Fingerprint identification is to classify and compare fingerprints of an identification object so as to distinguish, and the first step is to collect a fingerprint image. At present, the collection of original images of fingerprints generally comprises optical input by direct pressing, and the fingerprint images are obtained by utilizing the reflection of light; in addition, the method comprises the steps of fingerprint acquisition by a capacitive sensor, temperature sensing acquisition, chip input, ultrasonic input, electromagnetic fingerprint acquisition and the like. The existing fingerprint collection also has some defects, for example, the state of sweat pores can be influenced by different objective environments such as temperature, humidity and the like during fingerprint collection, a printing material is pressed to block the sweat pores and cannot be clearly recorded, the situations of weak, incomplete, deformation and the like of the sweat pores are identified by fingerprints on site, the difficulty of fingerprint display and extraction is increased, and particularly the difficulty of extraction of the fingerprint sweat pores on carriers made of different materials is higher. With the recent years, fingerprint collection and identification play a positive role in criminal investigation; the rapid development of wearable equipment and the Internet ensures that the development of a fingerprint identification and acquisition technology capable of improving acquisition accuracy and stability has great practical significance and potential application value.
Disclosure of Invention
The invention aims to provide a MoO based on a thermochromic effect aiming at the defects of stability and accuracy of the existing fingerprint acquisition and identification3Use of ceramics, using MoO with fast thermochromic effect3Ceramic material for realizing fingerprint collectionSet and identify when finger is in MoO3The surface of the ceramic is pressed to leave sweat latent fingerprints, and MoO can be generated after heating and heat preservation3The sweat latent fingerprints on the ceramic surface are displayed in the form of blue obvious fingerprints, so that fingerprint collection and identification are carried out. Compared with the prior fingerprint acquisition and identification technology, the fingerprint acquisition and identification based on the thermochromism phenomenon has the advantages of convenience, good stability, long storage time, high accuracy and the like. The invention is realized by the following technical scheme.
MoO based on thermochromism effect3Use of ceramic materials, MoO with fast thermochromic effect3Ceramics, by pressing MoO with fingers3Leaving latent sweat fingerprints on the surface of the ceramic material, heating and preserving heat at 200-300 ℃, and MoO after heating and preserving heat3Sweat latent fingerprints on the ceramic surface are shown in a blue obvious fingerprint form, and MoO is utilized3The thermochromic effect of the ceramic realizes fingerprint acquisition and identification.
MoO based on thermochromic effect3Preparation method and application of ceramic material, and MoO with rapid thermochromic effect3The preparation method of the ceramic comprises the following specific steps:
(1) firstly (NH)4)6Mo7O24·4H2Mixing and grinding O and absolute ethyl alcohol, heating to 100 ℃ in air atmosphere, keeping the temperature for 1 hour, cooling to room temperature along with the furnace temperature, and pressing into a wafer;
(2) heating the wafer obtained in the step (1) to 500-600 ℃ in an air atmosphere, preserving heat for 2 hours, and cooling the wafer to room temperature along with a furnace to obtain MoO3And (5) ceramic plates.
MoO based on thermochromic effect3Round piece of ceramic material with a diameter of 18mm
The invention has the beneficial effects that:
(1) when the finger is in MoO3The surface of the ceramic is pressed to leave sweat latent fingerprints, and MoO can be generated after heating and heat preservation3Sweat latent fingerprints on the ceramic surface appear in the form of blue distinct fingerprints.
(2) MoO synthesized by the invention3Ceramic material toolHas excellent photochromic property, and has the advantages of convenience, good stability, long preservation time, high accuracy and the like.
(3) The preparation method is simple in preparation process and low in cost, and is expected to realize industrial production.
Drawings
FIG. 1 shows MoO obtained in examples 1 and 2 of the present invention3Ceramic pictures.
FIG. 2 shows MoO obtained in examples 1 and 2 of the present invention3And a fingerprint identification image is displayed on the surface of the ceramic after fingerprint pressing and light irradiation.
Figure 3 is a picture of the overt fingerprint obtained from examples 1,2 of the present invention after 6 months of exposure to air.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example 1
MoO based on thermochromic effect3Use of ceramics, MoO used3MoO of ceramic chip after fingerprint pressing and 200 ℃ heat preservation3Ceramic due to MoO3The thermochromic effect of (a) shows a clear fingerprint. MoO3The resulting picture after the ceramic wafer was left in air for 6 months under fingerprint compression is shown in figure 2. MoO based on thermochromic effect3Use of ceramics, using MoO3The thermochromic effect of the ceramic realizes fingerprint acquisition and identification.
MoO based on thermochromic effect3Use of ceramic materials, MoO using thermochromic effect3The preparation method of the ceramic comprises the following specific steps:
(1) first, 1.5g (NH) was weighed4)6Mo7O24·4H2Adding 5ml of absolute ethyl alcohol, grinding to obtain a mixed material, heating to 100 ℃ in an air atmosphere, keeping the temperature for 1 hour, cooling to room temperature along with the furnace temperature, and pressing into a wafer with the diameter of 18mm by using a tablet press;
(2) keeping the temperature at 500 ℃ for 2 hours in the air atmosphere, and then cooling the mixture to room temperature along with the furnace to obtain MoO3And (5) ceramic plates.
MoO prepared in this example3The ceramic sheet is shown in fig. 1, and it can be seen from fig. 1 that the color is grey.
Example 2
MoO based on thermochromic effect3Use of ceramics, MoO used3MoO of ceramic chip after fingerprint pressing and heat preservation at 300 DEG C3Ceramic due to MoO3The thermochromic effect of (a) shows a clear fingerprint. MoO3The resulting picture after the ceramic wafer was left in air for 6 months under fingerprint compression is shown in figure 2. MoO based on thermochromic effect3Use of ceramics, MoO using thermochromic effect3Ceramics, using MoO3The thermochromic effect of the ceramic realizes fingerprint acquisition and identification.
MoO based on thermochromic effect3Use of ceramic materials, MoO using thermochromic effect3The preparation method of the ceramic comprises the following specific steps:
(1) first, 1.5g (NH) was weighed4)6Mo7O24·4H2Adding 5ml of absolute ethyl alcohol, grinding to obtain a mixed material, heating to 100 ℃ in an air atmosphere, keeping the temperature for 1 hour, cooling to room temperature along with the furnace temperature, and pressing into a wafer with the diameter of 18mm by using a tablet press;
(2) keeping the temperature at 500 ℃ for 2 hours in the air atmosphere, and then cooling the mixture to room temperature along with the furnace to obtain MoO3And (5) ceramic plates.
MoO prepared in this example3The ceramic sheet is shown in fig. 1, and it can be seen from fig. 1 that the color is grey.
Example 3
MoO based on thermochromic effect3Use of ceramics, MoO used3MoO of ceramic chip after fingerprint pressing and 200 ℃ heat preservation3Ceramic due to MoO3The thermochromic effect of (a) shows a clear fingerprint. MoO3The resulting picture after the ceramic wafer was left in air for 6 months under fingerprint compression is shown in figure 2. MoO based on thermochromic effect3Use of ceramics, MoO using thermochromic effect3Ceramics, use ofMoO3The thermochromic effect of the ceramic realizes fingerprint acquisition and identification.
MoO based on thermochromic effect3Use of ceramic materials, MoO with thermochromic effect3The preparation method of the ceramic comprises the following specific steps:
(1) first, 1.5g (NH) was weighed4)6Mo7O24·4H2Adding 5ml of absolute ethyl alcohol, grinding to obtain a mixed material, heating to 100 ℃ in an air atmosphere, keeping the temperature for 1 hour, cooling to room temperature along with the furnace temperature, and pressing into a wafer with the diameter of 18mm by using a tablet press;
(2) keeping the temperature at 600 ℃ for 2 hours in the air atmosphere, and then cooling the mixture to room temperature along with the furnace to obtain MoO3And (5) ceramic plates.
MoO prepared in this example3The ceramic sheet is shown in fig. 1, and it can be seen from fig. 1 that the color is light yellow.
Example 4
MoO based on thermochromic effect3Use of ceramics, MoO used3MoO of ceramic chip after fingerprint pressing and heat preservation at 300 DEG C3Ceramic due to MoO3The thermochromic effect of (a) shows a clear fingerprint. MoO3The resulting picture after the ceramic wafer was left in air for 6 months under fingerprint compression is shown in figure 2. MoO based on thermochromic effect3Use of ceramics, MoO using thermochromic effect3Ceramics, using MoO3The thermochromic effect of the ceramic realizes fingerprint acquisition and identification.
MoO based on thermochromic effect3Use of ceramic materials, MoO with thermochromic effect3The preparation method of the ceramic comprises the following specific steps:
(1) first, 1.5g (NH) was weighed4)6Mo7O24·4H2Adding 5ml of absolute ethyl alcohol, grinding to obtain a mixed material, heating to 100 ℃ in an air atmosphere, keeping the temperature for 1 hour, cooling to room temperature along with the furnace temperature, and pressing into a wafer with the diameter of 18mm by using a tablet press;
(2) under air atmosphere, at 600 deg.CCooling to room temperature along with the furnace after warming for 2 hours to obtain MoO3And (5) ceramic plates.
MoO prepared in this example3The ceramic sheet is shown in fig. 1, and it can be seen from fig. 1 that the color is light yellow.
MoO obtained in examples 1 to 4 of the invention3Ceramics, as shown in FIG. 1, from FIG. 1 it can be seen that MoO is produced at a sintering temperature of 500 deg.C3The ceramic color is gray, and MoO is prepared at 600 DEG C3The ceramic color is light yellow.
FIG. 2 of the present invention is the MoO obtained in examples 1-4 after fingerprint pressing and incubation at 200 ℃ and 300 ℃3Ceramic due to MoO3The thermochromic effect of (a) shows a clear fingerprint.
Figure 3 of the present invention is a picture of the overt fingerprint obtained in examples 1-4 after 6 months of exposure to air.
MoO obtained in examples 1 to 4 of the invention3The ceramic obtained when the sintering temperature is 500 ℃ and 600 ℃ is a ceramic wafer with a thermochromic effect, and the fingerprint displayed according to the thermochromic phenomenon has the advantages of convenience, good stability, long storage time and high accuracy. MoO illustrating thermochromic behavior3Has wide application prospect in the field of fingerprint identification and collection.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.

Claims (3)

1. MoO based on thermochromism effect3Use of ceramic materials, characterised in that MoO with a fast thermochromic effect is used3Ceramics, by pressing MoO with fingers3Leaving latent sweat fingerprints on the surface of the ceramic material, heating and preserving heat at 200-300 ℃, and MoO after heating and preserving heat3Sweat latent fingerprints on the ceramic surface are shown in a blue obvious fingerprint form, and MoO is utilized3The thermochromic effect of the ceramic realizes fingerprint acquisition and identification.
2. The MoO based on thermochromic effect according to claim 13Use of a ceramic material, characterized in that the MoO of the thermochromic effect3The preparation method of the ceramic comprises the following specific steps:
(1) firstly (NH)4)6Mo7O24·4H2Mixing and grinding O and absolute ethyl alcohol, heating to 100 ℃ in air atmosphere, keeping the temperature for 1 hour, cooling to room temperature along with the furnace temperature, and pressing into a wafer;
(2) heating the wafer obtained in the step (1) to 500-600 ℃ in an air atmosphere, preserving heat for 2 hours, and cooling the wafer to room temperature along with a furnace to obtain MoO3And (5) ceramic plates.
3. The MoO based on thermochromic effect according to claim 23Use of a ceramic material, characterized in that: the diameter of the round piece in the step (1) is 18 mm.
CN201910834686.7A 2019-09-05 2019-09-05 MoO based on thermochromism effect3Application of ceramics Active CN110511024B (en)

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CN103919558B (en) * 2014-04-13 2016-03-16 中南民族大学 Fluorescent quenching system is used for the method that latent fingerprint manifests
CN105160307A (en) * 2015-08-13 2015-12-16 江南大学 Rolling fingerprint acquisition method based on thermochromic principle
CN205538681U (en) * 2016-01-28 2016-08-31 公安部物证鉴定中心 Latent impression of hand thermic fluorescent inspection equipment of sweat on paper
CN110079315A (en) * 2019-04-08 2019-08-02 昆明理工大学 A kind of thermochromism MoO3: Yb, Er up-conversion phosphor, preparation method and its reversible regulation method of up-conversion luminescence

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MoO3 nanostructures from EGCG assisted sonochemical route:Evaluation of its application towards forensic and photocatalysis;H.S.Yogananda et al.;《Journal of Alloys and Compounds》;20180515;第745卷;第874-891页 *
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