Abstract
The instantaneous isolation of green fluorescent colloidal quantum dots of iron selenide capped with biocompatible oleic acid is reported in this study. These iron-containing quantum dots also serve as a safe alternative to the conventionally used metal-chalcogenide systems in which the heavy metal component is usually toxic. The isolated colored colloidal solutions exhibited intense green fluorescence on exposure to ultraviolet light, which was also confirmed by photoluminescence spectroscopy. The isolated product was subjected to dynamic light scattering and transmission electron microscopy, and the particles were found to exhibit spherical morphology with an average diameter of 6–8 nm, confirming the isolation of quantum dots. The isolated iron selenide quantum dots have promising potential towards bioimaging and sensing, due to the biocompatible coating of oleic acid and iron, which also allows possibility of further chemical derivatization.
Highlights
Quantum dots (QDs) have emerged as one of the most fascinating systems in the new millennium. They have garnered widespread interest amongst a multitude of research groups as they exhibit higher extinction coefficients, higher quantum yields, less photobleaching, broad absorption, and narrow emissions, which can be tuned with size [1, 2]
The preliminary particle size analyses for the samples were performed with the dynamic light scattering technique (DLS), using the instrument Zetasizer Nano (Malvern Nano ZS) involving the advantageous noninvasive backscatter detection at 173∘
The entire experiment when repeated several times produced concordant results and the synthesized samples were found to be very stable at room temperature
Summary
Quantum dots (QDs) have emerged as one of the most fascinating systems in the new millennium They have garnered widespread interest amongst a multitude of research groups as they exhibit higher extinction coefficients, higher quantum yields, less photobleaching, broad absorption, and narrow emissions, which can be tuned with size [1, 2]. Motivated by the extraordinary benefit of these systems, we made efforts to isolate oleic acid capped iron selenide quantum dots via the hot injection route, which has not been reported previously. This would make iron selenide QDs, a probable candidate for targeted delivery under the influence of a magnetic field It can even be used for applications like MRI for which quantum dot systems are already being. The final isolated product was characterized by UV, PL, DLS, TEM, and FT-Raman to ascertain the optical properties, size, and chemical composition
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