Metal ion coordinated carbon dot/titanium dioxide heterojunction as well as preparation method and application thereof
A metal ion and titanium dioxide technology, applied in the field of biomedicine, can solve the problems of low sensitivity, easily interfered detection limit, etc., and achieve the effects of high biocompatibility, low cost, and simple preparation process
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Embodiment 1
[0035] Preparation method of pyridine N-doped carbon dots (CDs)
[0036] a. Slowly add 4g pyrene to 320mL concentrated nitric acid (mass fraction 68%), react at 80°C for 48h by condensing and refluxing, after cooling to room temperature, dilute the obtained mixture solution with deionized water, and repeatedly suction filter and wash until neutral Post-drying to obtain trinitropyrene;
[0037]b. Weigh 0.025g of trinitropyrene obtained in step a, and add it to 10mL of water; then add 1ml of hydrazine hydrate to the solution, stir the solution for 10min, then transfer the solution to a 30mL microwave reaction tube, and heat at 200°C Reaction at high temperature for 30min;
[0038] c. After natural cooling, take out the carbon dots obtained in step b, filter with a 220nm filter membrane, transfer the filtered solution to a dialysis bag for dialysis for 2 days, and dry the solution by rotary evaporation to finally obtain pyridine N-doped carbon dot powder .
Embodiment 2
[0040] Preparation method of carbon dots coordinated by metal ions (Pt(IV)-CDs):
[0041] Weigh CDs and K according to the mass ratio of 1:2 2 PtCl 4 The powder was dissolved in water, and stirred and reacted at room temperature for 1.5 hours. After the reaction, the precipitate was collected by centrifugation and washed three times with deionized water, and dried to obtain platinum coordination functionalized carbon dots.
Embodiment 3
[0043] Oxygen vacancy doped TiO 2-x The preparation method:
[0044] a. Measure 10mL tetra-n-butyl titanate into a 50mL polytetrafluoroethylene-lined reaction kettle, slowly add 1.2mL hydrofluoric acid under stirring conditions, and react at 180°C for 24 hours after ultrasonication for 10 minutes;
[0045] b. After naturally cooling to room temperature, collect the white precipitate and wash it three times with ethanol and deionized water, and dry it to obtain white TiO 2 Nanosheets;
[0046] c. Weigh 0.6g of white TiO prepared in step b 2 Mix the powder and 0.6g sodium borohydride well and place it in a tube furnace under a nitrogen atmosphere at 400°C for 3h. After cooling down to room temperature naturally, slowly add the obtained black powder into 1M hydrochloric acid solution and stir for 1.5h. Collect the black powder by centrifugation. Precipitated and washed with ethanol and deionized water several times, and finally vacuum-dried to obtain oxygen vacancy-doped TiO ...
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