Abstract
The binding of ligands to nanometer-sized surfaces is a central aspect of colloidal nanocrystal (NC) research, for which CdSe NCs were mostly used as the model system to evaluate different surface ...
Highlights
Colloidal semiconductor nanocrystals (NCs) or quantum dots (QDs) are a new class of solution-processable opto-electronic materials.[1,2] The precision synthesis of NCs by hot injection made available NC batches with well-defined optical properties that can be tuned by adjusting the size, shape, or composition of the NCs and used for the development of displays, light sources and lasers, optical sensors, and solar cells.[3−8] Colloidal NCs consist of an inorganic core and an outer surface that is typically passivated by organic ligands.[9]
Using solution 1H nuclear magnetic resonance (NMR) spectroscopy, we demonstrate that in both cases, the as-synthesized, purified NCs are capped by CdOA2
For a systematic study of surface passivation, we focused on CdSe and CdS NC samples having (1) similar dimensions, (2) same zinc blende crystal structure, and (3) same cadmium oleate [Cd(OA)2] ligands
Summary
Colloidal semiconductor nanocrystals (NCs) or quantum dots (QDs) are a new class of solution-processable opto-electronic materials.[1,2] The precision synthesis of NCs by hot injection made available NC batches with well-defined optical properties that can be tuned by adjusting the size, shape, or composition of the NCs and used for the development of displays, light sources and lasers, optical sensors, and solar cells.[3−8] Colloidal NCs consist of an inorganic core and an outer surface that is typically passivated by organic ligands.[9] These ligands are primarily used to control NC nucleation and growth during synthesis and stabilize NC dispersions. A similar picture was retrieved in the case of CdSe NCs synthesized using cadmium phosphonates, with alkyl phosphonate and phosphonate anhydrides instead of oleate binding to excess surface
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