A method for measuring the coverage of ligands on the surface of quantum dots
A technology of surface ligands and measurement methods, applied in the field of quantum dots, can solve the problems of poor solubility, poor uniformity of quantum dot solution, and non-uniform photoelectric efficiency.
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Embodiment 1
[0044] The coverage of octanethiol ligands on the surface of CdZnSe / CdZnSe / ZnSe quantum dots was determined.
[0045] The average particle size d of the CdZnSe / CdZnSe / ZnSe quantum dots was determined. Dissolve CdZnSe / CdZnSe / ZnSe quantum dots whose surface ligand is octanethiol in n-hexane solution, and prepare a 5 mg / ml solution. After the solution is completely dissolved, take a small amount of quantum dot solution and drop 5 drops on the copper mesh. The copper mesh was placed in a transmission electron microscope analyzer for testing and analysis. Set the accelerating voltage to 200 kV, the emission current to 10 μA, the working distance to 15 mm, and the dead time to be 20%. To zoom in and analyze the sample, first set the magnification to 70,000 times, take the area where the quantum dots are concentrated and evenly dispersed for focusing analysis, and take its TEM picture. To analyze the TEM images, first set the length of the scale, and then take 30-80 quantum dots fo...
Embodiment 2
[0051] The coverage of octadecylphosphoric acid on the surface of CdZnSe quantum dots was determined.
[0052] The average particle size d of the CdZnSe quantum dots was determined. Dissolve CdZnSe quantum dots whose surface ligand is octadecylphosphoric acid in n-hexane solution to prepare a 3 mg / ml solution. After the solution is completely dissolved, take a small amount of quantum dot solution and drop 8 drops on the copper mesh. Placed in a transmission electron microscope analyzer for test analysis. Set the accelerating voltage to 300 kV, the emission current to 20 μA, the working distance to be 20 mm, and the dead time to be 40%. To zoom in and analyze the sample, first set the magnification to 150,000 times, take the area where the quantum dots are concentrated and evenly dispersed for focusing analysis, and take its TEM picture. The TEM image was analyzed, the length of the scale was set first, and then 30-80 quantum dots were selected for calibration, and the averag...
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