The Trouble with ODE: Polymerization during Nanocrystal Synthesis

Dhaene, Evert and Billet, Jonas and Bennett, Ellie and Van Driessche, Isabel and De Roo, Jonathan. (2019) The Trouble with ODE: Polymerization during Nanocrystal Synthesis. Nano Letters, 19 (10). pp. 7411-7417.

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Official URL: https://edoc.unibas.ch/72228/

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1-Octadecene is a widely used solvent for high-temperature nanocrystal synthesis (120–320 °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.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Nanomaterials (De Roo)
UniBasel Contributors:De Roo, Jonathan
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:16 Sep 2020 01:30
Deposited On:22 Oct 2019 14:18

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