期刊
NANO LETTERS
卷 19, 期 10, 页码 7411-7417出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03088
关键词
Quantum dots; nanoparticles; octadecene; surface chemistry
类别
资金
- FWO Vlaanderen
- Special Research Fund/Concerted Research Actions project [BOF2015/GOA/007]
- Ghent University
- Columbia University
- Fulbright
- Belgian American Education Foundation
- COMPASS project [H2020-MSCA-RISE-2015691185]
1-Octadecene is a widely used solvent for high temperature nanocrystal synthesis (120-320 degrees C). Here, we show that 1-octadecene spontaneously polymerizes under these conditions, and the resulting poly(1-octadecene) has a comparable solubility and size to nanocrystals stabilized by hydrophobic ligands. Typical purification procedures (precipitation/redispersion cycles or size exclusion chromatography) fail to separate the poly(1-octadecene) impurity from the nanocrystal product. To avoid formation of poly(1-octadecene), we replace 1-octadecene with saturated, aliphatic solvents. Alternatively, the nanocrystals' native ligands are exchanged for polar ligands, leading to significant solubility differences between nanocrystals and poly(1-octadecene), therefore allowing isolation of pure nanocrystals, free from polymer impurities. These results will help design superior syntheses and improve nanocrystal purity, an important factor in many applications.
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