A method for measuring the coverage of ligands on the surface of quantum dots
A surface ligand and measurement method technology, applied in the field of quantum dots, can solve the problems of low pixel resolution, poor uniformity of quantum dot solution, and uneven photoelectric efficiency
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Embodiment 1
[0037] Determination of the coverage of phosphorus-containing ligands on the surface of CdZnSe / CdZnSe / ZnSe quantum dots
[0038] 1. Determine the average particle size d of CdZnSe / CdZnSe / ZnSe quantum dots, and the surface ligands of CdZnSe / CdZnSe / ZnSe quantum dots with tetradecyl phosphoric acid are dissolved in n-hexane solution, and the prepared solution of 5 mg / ml is to be After the solution was completely dissolved, a small amount of quantum dot solution was taken and 5 drops were placed on the copper mesh, and the carbon 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 be 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. The TEM images were analyzed, t...
Embodiment 2
[0046] Determination of the coverage of phosphorus-containing ligands on the surface of CdZnS / ZnS quantum dots
[0047] 1. Determine the average particle size d of CdZnS / ZnS quantum dots, take the CdZnS / ZnS quantum dots whose surface ligands are cetylphosphoric acid and trioctylphosphine and dissolve them in n-hexane solution to prepare a 3 mg / ml solution , after the solution is completely dissolved, a small amount of quantum dot solution is taken and 8 drops are placed on the copper mesh, and the carbon mesh is placed in a transmission electron microscope analyzer for testing and analysis. Set the accelerating voltage to 300 kV, the emission current to 20 μA, the working distance to 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 images were analyzed, the length of the scale wa...
Embodiment 3
[0055] Determination of the coverage of phosphorus-containing ligands on the surface of CdZnS / ZnSe quantum dots
[0056] 1. Determine the average particle size d of the CdZnS / ZnSe quantum dots. Dissolve CdZnS / ZnSe quantum dots whose surface ligand is octadecylphosphoric acid in n-hexane solution to prepare a 1 mg / ml solution. After the solution is completely dissolved, take a small amount of quantum dot solution and drop 10 drops on the copper mesh. The carbon mesh was 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 20 mm, and the dead time to be 40%. To zoom in and analyze the sample, first set the magnification to 100,000 times, take the area where the quantum dots are concentrated and evenly dispersed for focusing analysis, and take its TEM picture. The TEM images were analyzed, the length of the scale was set first, and then 30-80 quantum dots were sele...
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