Enhanced Ripening Behaviour of Cadmium Selenide Quantum Dots (CdSe QDs)

摘要

In this research, cadmium selenide quantum dots (CdSe QDs) are synthesized successfully in theabsence of trioctylphosphine (TOP) for 46 minutes and characterized by TEM and XRD analysis. TheTEM image reveals that the CdSe QDs are spherical, compact with a dense stucture. The ripeningbehaviour of CdSe QDs is monitored using the red-shift characteristic in the UV-visible absorptionpeaks, and their size variations are estimated by the quantum confinement theory. The coarseningeffect of CdSe QDs can be observed clearly from LSW plots due to the increase in ripening time and-3 3 ripening temperature. The ripening coefficient is obtained to be 6.84 (10 ) nm /min. The Arrheniusplot provides the activation energy value of the ripened samples, which are very low compared to thesample prior ripening, and is attributed to the domination of volume diffusion through the liquid phase.