Quantification of the morphological transition in cadmium selenide nanocrystals as a function of reaction temperature

Michael, Cameron; Rogerson, Jordan A.; Blom, Douglas A.; Dukes, Albert D.

doi:10.1007/s11706-016-0319-y

Cited by 1 publication

(2 citation statements)

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“…In our study, the CdSe nanocrystal surface was passivated with oleic acid, which bonds to the surface via a carboxylic acid. Previous synthetic work on CdSe nanocrystals has demonstrated that the choice of surface ligands can influence the overall shape of a nanocrystal due to the surface ligands binding more tightly at certain facets [16,26]. It is possible that ligands which bind more tightly to the surface would prevent the surface atoms from rearranging at elevated temperatures; this could lead to nanocrystals of the same size having different melting points based upon their surface passivation.…”

Section: Resultsmentioning

confidence: 99%

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Comparison of the observed size-dependent melting point of CdSe nanocrystals to theoretical predictions

et al. 2018

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Cadmium selenide nanocrystals were observed to have a size-dependent melting point which was depressed relative to the bulk melting temperature. The observed size-dependent melting point ranged from 500-1478 K, while a model based on the surface area to volume ratio predicted that is should range between 774-1250 K. The nanocrystals were heated in situ in the electron microscope, and the melting point was almost immediately followed by the vaporization of the CdSe nanocrystals, allowing for straightforward determination of the melting temperature. The differences between the observed melting point of CdSe nanocrystals and the values predicted by the surface area to volume ratio model indicates that additional factors are involved in the melting point depression of nanocrystals.

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Section: Resultsmentioning

confidence: 99%

“…STEM imaging conditions are similar to those we have described in a previous report [16]. Electron microscopy was performed utilizing a JEOL 2100 F 200 kV field emission gun (FEG)-STEM/TEM equipped with a Corrected Electron Optical System (CEOS).…”

Section: Instrumentationmentioning

confidence: 99%