Preparation of cellulose-based carbon quantum dots and application of cellulose-based carbon quantum dots in uric acid detection
A technology based on carbon quantum and cellulose, which is applied in the field of preparation of fluorescent carbon quantum dots, can solve problems such as the reduction of fluorescence emission intensity, and achieve the effects of easy large-scale production, low cost, and simple operation methods
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[0028] A preparation method of cellulose-based carbon quantum dots, comprising:
[0029] Cellulose-based carbon quantum dots were prepared by one-step hydrothermal method using cellulose acetate, melamine and sodium thiosulfate as raw materials.
[0030] The research found that: after synthesizing fluorescent carbon quantum dots with cellulose acetate, melamine and sodium thiosulfate as basic raw materials, AuNPs as absorber, adding Ag + In the case of uric acid, in an alkaline environment, with the addition of uric acid, uric acid has a certain reducibility, which will reduce Ag + reduced to Ag 0 , thus attaching to the surface of AuNPs to form an in-situ Ag 0 The shell layer becomes Au@AgNPs, which blue-shifts the plasmon resonance absorption peak position to about 513 nm, and the position of the absorption peak will also be correspondingly enhanced, so that when it is blended with the carbon quantum dots prepared by the present invention and emitted, it passes through the...
Embodiment 1
[0043] Example 1 Preparation of Fluorescent Carbon Quantum Dots
[0044] The preparation method steps are as follows:
[0045] Take 1g of cellulose acetate, 0.7g of melamine and 0.4g of sodium thiosulfate respectively in a beaker, add 35mL of ultrapure water, fully stir and sonicate for 40min, transfer the fully dispersed solution to the polytetrafluoroethylene of the high-pressure hydrothermal reactor. In the vinyl fluoride lining, the oven was preheated to 180 °C in advance, and the reaction was carried out for 21 h. After the reaction, the reactor was taken out and cooled to room temperature, and the reaction solution was taken out for ultrasonic treatment for 30 min again, and the supernatant was taken. After filtration, the solution was dialyzed in a dialysis bag with a molecular cut-off of 1000 for 72 hours to obtain a yellow-green fluorescent carbon quantum dot solution. Finally, the dialyzed solution was placed in a freeze dryer for freeze drying to obtain a dark bro...
Embodiment 2
[0046] Example 2 TEM of two-phase structure fluorescent microgels
[0047] The carbon quantum dot solution prepared in Example 1 was dripped on the copper mesh in advance and placed in a constant temperature incubator for 12h. The TEM image obtained by shooting is as follows figure 2 As shown, the carbon quantum dots are uniformly distributed with an average size of 10 nm. image 3 is the infrared spectrum of the prepared carbon dots, such as image 3 shown at 3420cm -1 There is an O-H stretching vibration peak at 3210cm -1 is the N-H stretching vibration peak. Stretching vibration peaks of C=O bond and C=C bond, the peaks are 1630 cm, respectively -1 and 1590cm -1 . 1400cm -1 is the absorption peak of C-N, and the stretching vibration peak of C-S is at 1120 cm -1 In summary, it was proved by infrared spectroscopy that the carbon quantum dots were successfully doped with N and S elements to form corresponding chemical bonds.
[0048] Plasmon resonance UV absorption s...
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