TY  - JOUR
AU  - Yang, Yu
AU  - Li, Jiongzhao
AU  - Lin, Long
AU  - Peng, Xiaogang
PY  - 2015
TI  - An efficient and surface-benign purification scheme for colloidal nanocrystals based on quantitative assessment
JO  - Nano Research
SN  - 1998-0124
SP  - 3353
EP  - 3364
VL  - 8
IS  - 10
AB  - General application of "greener methods" to the synthesis of monodisperse colloidal nanocrystals introduces impurities, including metal carboxylate precursors, non-volatile solvents, free ligands, and non-nanocrystalline side products. These impurities seriously diminish the solution processability and potential applications of colloidal nanocrystals. A protocol was established for evaluating purification schemes. The results revealed that commonly applied purification schemes and their variants do not exhibit a high level of performance and may degrade the ligand surface coverage. A new scheme involving chloroform–acetonitrile precipitation quantitatively removed all impurities from colloidal solutions of CdSe and CdS nanocrystals coated with a variety of carboxylate ligands. The new scheme was benign to the surface structure of nanocrystal-ligands complexes and resulted in each nanocrystal bearing a close-packed monolayer of carboxylate ligands.
UR  - https://doi.org/10.1007/s12274-015-0835-6
DO  - 10.1007/s12274-015-0835-6