When i synthesize the perovskite nanocrystal, after centrifugation, there are a PL peak at 500 nm and a shoulder at around 440nm, which should belong to nanoplatelets. i don't want to this shoulder, so how can i remove all of the nanoplatelets.
Please give me some advice, thank you！
One possible way to remove the NPls from the PNCs is to use a selective precipitation method, which exploits the difference in solubility between the two types of nanocrystals. For example, you can add a polar solvent, such as ethanol, to the solution containing the PNCs and NPls, and then centrifuge the mixture. The PNCs will precipitate at the bottom of the tube, while the NPls will remain in the supernatant. You can then discard the supernatant and redissolve the PNCs in a non-polar solvent, such as toluene .
Another possible way to remove the NPls from the PNCs is to use a size-exclusion chromatography (SEC) method, which separates the nanocrystals based on their size and shape. For example, you can load the solution containing the PNCs and NPls onto a column filled with porous gel beads, such as Sephadex G-50. The NPls, which are larger and flatter than the PNCs, will be excluded from the pores and elute faster than the PNCs, which will enter the pores and elute slower. You can then collect the fractions containing the PNCs and NPls separately.
I hope this helps you with your synthesis of perovskite nanocrystals.
Li Xu, To selectively remove nanoplatelets and purify perovskite nanocubes from synthesis, various purification techniques can be employed. These include optimizing centrifugation conditions, selective precipitation, size-exclusion chromatography (SEC), characterization, and iterative purification. Here, I'll explain the way to purify perovskite nanocubes by optimizing centrifugation conditions. Follow these steps: prepare the solution, adjust centrifugation parameters [Centrifuge Speed, centrifuge Duration, and Centrifuge Temperature], choose an appropriate centrifuge rotor, prepare the sample, handle the supernatant, characterize the solution, refine centrifugation conditions, consider nanoparticle stability, validate the purification process, and keep detailed records for future reference and reproducibility. This method helps to remove the undesired shoulder at 440 nm and obtain purified perovskite nanocubes with a cleaner emission peak at 500 nm.
I trust that the provided guidance will prove beneficial in facilitating your synthesis of perovskite nanocrystals. Wishing you the utmost success in your endeavors. If further assistance is required, please do not hesitate to seek support.
Best of luck.
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