Molybdenum disulfide quantum dot-chiral gold nano particle assembly as well as preparation method and application thereof
A gold nanoparticle and molybdenum disulfide technology, which is applied in the field of molybdenum disulfide quantum dot-chiral gold nanoparticle assembly and its preparation, can solve the problems of unsuitable real-time analysis, expensive and complex sample pretreatment process, etc.
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Embodiment 1
[0038] Embodiment 1: In the present embodiment, tetrachloroauric acid trihydrate is adopted.
[0039]Add 0.025mmol of tetrachloroauric acid trihydrate (molecular weight 393.83) and 0.025mmol of N-acetyl-L-cysteine to 50mL of ultrapure water and stir, add 1mL of 4mg / mL (about 0.1mmol) hydroboration Sodium solution, the solution gradually changed from yellow to deep red, and continued to stir at room temperature for 2 hours to obtain a solution of chiral gold nanoparticles functionalized with N-acetyl-L-cysteine. Since the absorbance of gold nanoparticles at 520 nm is 1.861, the concentration of the chiral gold nanoparticles solution is calculated to be about 6.89 nmol / L according to Lambert-Beer's law. figure 1 Infrared spectra of chiral gold nanoparticles functionalized for N-acetyl-L-cysteine and N-acetyl-L-cysteine, from the infrared spectrum of N-acetyl-L-cysteine can be It can be seen that at 2547cm -1 There is an obvious peak at , which is due to the stretching vi...
Embodiment 2
[0041] The preparation of molybdenum disulfide quantum dots includes the following steps: dissolve 0.5mmol sodium molybdate dihydrate in 10mL ultrapure water, stir ultrasonically for 5min, add HCl to adjust the pH to 6.5, add 2mmol reduced glutathione and 20mL ultrapure water Pure water, after ultrasonication for 10min, transfer the solution into a polytetrafluoroethylene reactor, react at a constant temperature of 200°C for 24h, cool to room temperature and centrifuge for 5min, collect the supernatant to obtain a yellow molybdenum disulfide quantum dot dispersion. figure 2 It is a transmission electron microscope picture of molybdenum disulfide quantum dots. It can be seen from the figure that the molybdenum disulfide quantum dots are well dispersed, the size distribution is uniform, and the average particle size is about 3nm.
Embodiment 3
[0042] Example 3: Preparation of molybdenum disulfide quantum dots-chiral gold nanoparticle assembly: Pipette 1mL of N-acetyl-L-cysteine functionalized chiral gold nanoparticle solution prepared in Example 1 , adding 25 μL of the molybdenum disulfide quantum dot dispersion solution prepared in Example 2, mixing and incubating for 10-20 min, and the molybdenum disulfide quantum dot-chiral gold nanoparticle assembly can be obtained.
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