Preparation method of graphite-phase carbon nitride solid fluorescent powder and application thereof in light fingerprint extraction
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A graphite-phase carbon nitride and fluorescent powder technology, applied in chemical instruments and methods, nitrogen and non-metallic compounds, luminescent materials, etc., can solve the problems of weak fluorescence intensity and low quantum yield, and achieve easy synthesis and synthetic methods Simple, easy to compare and save the effect
Inactive Publication Date: 2015-12-16
ZHENGZHOU UNIV
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Products of direct high-temperature condensation tend to have lower quantum yields and weaker fluorescence intensity
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Embodiment 1
[0023] A preparation method of graphite phase carbon nitride solid fluorescent powder, comprising the steps of:
[0024] a, take 8g of melamine, 10g of sodium chloride and 12g of potassium chloride in a mortar, fully grind and mix evenly for subsequent use;
[0025] b. Transfer the mixture prepared in step a into a crucible, place it in a muffle furnace, and calcine at a high temperature for 1 hour in an air atmosphere, and the calcination temperature is 670° C.;
[0026] c. Then cool to room temperature, crush the calcined block product and disperse it in 0.3mol / l dilute hydrochloric acid, then centrifuge to remove the supernatant; then wash repeatedly, and place the washed product in an oven at 60°C Drying in medium is graphite phase carbon nitride solid phosphor.
Embodiment 2
[0032] A preparation method of graphite phase carbon nitride solid fluorescent powder, comprising the steps of:
[0033] a. Weigh 9g of melamine, 11g of sodium chloride and 13g of potassium chloride in a mortar, grind and mix well for later use.
[0034] b. Transfer the mixed material prepared in step a into a crucible, place it in a muffle furnace, and calcine at a high temperature for 1 hour in an air atmosphere at a calcination temperature of 670°C.
[0035] c. Then cool to room temperature, crush the calcined block product and disperse it in 0.3mol / l dilute hydrochloric acid, then centrifuge to remove the supernatant; then wash repeatedly, and place the washed product in an oven at 60°C Drying in medium is graphite phase carbon nitride solid phosphor.
[0036] Application examples of graphitic carbon nitride solid phosphors for the display of fingerprints on the surface of different objects:
[0037] Select the mouse, cigarette case, can, and glass as the fingerprint car...
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Abstract
The invention provides a preparation method of graphite-phase carbon nitride solid fluorescent powder and application thereof in quickly developing latent fingerprints on different object surfaces. The graphite-phase carbon nitride solid fluorescent powder can be used for fluorescence labeling, and can be used in the fields of crime scene criminal detection and the like. The invention aims to quickly develop latent fingerprints on different individual and different object surfaces by utilizing the characteristic of photoluminescence of the nano graphite-phase carbon nitride. The high-fluorescence-responsivity graphite-phase carbon nitride solid fluorescent powder is prepared by using melamine as an N-containing precursor and using sodium chloride and potassium chloride as assistants. The application process in fingerprints comprises the following steps: lightly dipping a fingerprint brush into a small amount of graphite-phase carbon nitride solid fluorescent powder, lightly brushing the suspected fingerprint region, removing the excess powder, putting under a 365nm ultraviolet lamp, and observing the special blue light which is conveniently photographed and stored by a digital camera. Due to the specific adsorptivity of the nano material, the affinity between the nano powder and fingerprint ridges is high. The graphite-phase carbon nitride solid fluorescent powder can be used for successfully extracting fingerprints on different individual and different object surfaces.
Description
technical field [0001] The invention belongs to the nanometer material preparation technology and its application field as a fluorescence sensor in analysis and detection technology. In particular, it relates to a preparation method of graphite-phase carbon nitride solid fluorescent powder and its application in shallow fingerprint extraction. Background technique [0002] Nano-luminescent materials are widely used in the field of fluorescent labeling due to their unique optical characteristics and nano-size effect. In recent years, it has been rapidly developed as a fluorescent sensor for rapid visualization of latent fingerprints in criminal investigation scenes. The reported nano-luminescent materials for fingerprint display are mostly rare-earth ion-doped luminescent materials and semiconductor quantum dots composed of II-VI elements. [0003] In 2011, Claude Roux of the Sydney University of Technology reported for the first time that rare earth ion-doped up-conversion...
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