Occult blood fingerprint appearing agent, occult blood fingerprintappearing cotton piece and application ofoccult blood fingerprintappearing cotton piece
A technique of revealing agent and fingerprint, which is applied in the field of fingerprint revealing, can solve the problems of unsuitable occult blood fingerprint revealing, low fluorescence quantum yield, etc., and achieve the effects of clear revealing effect, convenient and simple operation process, and portability
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Embodiment 1
[0047] This embodiment provides an aminated polyphenylene acetylene fluorescent conjugated polymer and a preparation method thereof.
[0048] In this example, the synthesis of M1 can be found in the literature (J. Mater. Chem. C, 2017, 5, 5010-5017), and the synthesis of M2 can be found in the literature (ACS Appl. Mater. Interface, 2014, 6, 5041– 5049).
[0049] The structural formula of monomer M1 is
[0050]
[0051] The structural formula of monomer M2 is
[0052]
[0053] see attached figure 1 , the preparation of PPE-NBoc precursor: under the protection of argon, monomer M1 (0.284 g, 0.5 mmol), monomer M2 (0.307 g, 0.05 mmol), (PPh 3 ) 2 PdCl 2 (0.035 g, 0.05 mmol) and CuI (5 mg, 0.025 mmol) were added to a pre-dried flask, and then 8 mL of anhydrous tetrahydrofuran and 2 mL of anhydrous diisopropylamine were added. Under the protection of argon, stir at reflux at 60°C for 14h. After the reaction, the reactant was cooled to room temperature, filtered with a...
Embodiment 2
[0058] This embodiment provides an aminated polyphenylene acetylene fluorescent conjugated polymer PPE-NH 3 + Fingerprint developing agent and loaded PPE-NH 3 + The preparation method of the revealed cotton sheet, concrete steps are as follows:
[0059] 1. PPE-NH 3 + Preparation of fingerprint revealing agent: take polymer PPE-NH 3 + (0.0129 g, 0.015 mmol), DMF (5mL) in a 10 mL centrifuge tube, after the solid was completely dissolved, 5 mL of PPE-NH 3 + Fingerprint revealer.
[0060] 2. Cut the cotton non-woven fabric to a size of 2cm×3cm.
[0061] 3. Take 300 μL of the developing agent prepared in step 1 in a weighing bottle, immerse 2 cut cotton pieces in the developing agent, soak for 1 min, and take it out. The cotton pieces are wet, and the loaded PPE-NH 3 + The fingerprint revealing cotton sheet of the fingerprint revealing agent.
[0062] 4. Seal the display cotton piece in a plastic bag and store it in a cool and dry place.
Embodiment 3
[0064] This example provides a fresh occult blood fingerprint on the surface of the aluminum foil object, using the loaded PPE-NH prepared in Example 2 3 + The fingerprint revealing cotton sheet of the fingerprint revealing agent is used for revealing occult blood fingerprints to obtain fingerprint pictures under ultraviolet light. The specific steps are as follows:
[0065] 1. Put the aluminum foil object loaded with fresh occult blood fingerprints in a cool and dry place for 24 hours;
[0066] 2. Take a piece of loaded PPE-NH prepared in Example 2 3 + The fingerprint revealing cotton sheet of the fingerprint revealing agent is evenly covered on the aluminum foil object loaded with occult blood fingerprints, gently press to ensure that the cotton sheet is in full contact with the object, and stand for 2 minutes;
[0067] 3. Peel off the cotton piece from the aluminum foil smoothly, after drying, take pictures under 415nm light to obtain the blood occult fingerprints displa...
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