Surface Chemistry of CuInS2 Colloidal Nanocrystals, Tight Binding of L-Type Ligands
Citations Over TimeTop 10% of 2014 papers
Abstract
We analyze the surface chemistry of CuInS2 nanocrystals synthesized in the presence of amines. Using solution NMR spectroscopy and elemental analysis, we come to the conclusion that as-synthesized CuInS2 nanocrystals have charge neutral inorganic cores and are stabilized by a layer of tightly bound L-type amines. In situ NMR heating-up experiments show that desorption of amines can be induced by increasing the temperature, which makes the partial exchange of amines for thiols possible. On the other hand, we find that carboxylic acids are unable to bind as L-type ligands to the CuInS2 surface. In addition, we demonstrate that the use of technical oleylamine in the synthesis of CuInS2 nanocrystals leads to nonstoichiometric nanocrystals which have, next to oleylamine ligands, also X-type impurities on the surface that can be exchanged for carboxylic acids.
Related Papers
- → Hcp cobalt nanocrystals with high magnetic anisotropy prepared by easy one-pot synthesis(2016)40 cited
- → In situ capping for size control of monochalcogenide (ZnS, CdS and SnS) nanocrystals produced by anaerobic metal-reducing bacteria(2015)14 cited
- → Single-source precursor synthesis of colloidal CaS and SrS nanocrystals(2012)17 cited
- Susquehanna Chorale Spring Concert "Roots and Wings"(2017)
- Surfactant-assisted synthesis and magnetic properties of monodispersed manganese ferrite nanocrystals(2011)