Synthesis and characterization of colloidal CdSexS1-x/ZnS quantum dots

Mark V. Reymatias; Arjun Senthil; Dominic Bosomtwi; Shruti I. Gharde; Gema J. Alas; DeYannah J. Walker; Adreanna G. Rael; Nhi Nguyen; Nathan J. Withers; Sergei A. Ivanov; John Watt; Dale L. Huber; Marek Osiński

doi:10.1117/12.2553001

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16 March 2020 Synthesis and characterization of colloidal CdSe_xS_1-x/ZnS quantum dots

Mark V. Reymatias, Arjun Senthil, Dominic Bosomtwi, Shruti I. Gharde, Gema J. Alas, DeYannah J. Walker, Adreanna G. Rael, Nhi Nguyen, Nathan J. Withers, Sergei A. Ivanov, John Watt, Dale L. Huber, Marek Osiński

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Proceedings Volume 11255, Colloidal Nanoparticles for Biomedical Applications XV; 1125506 (2020) https://doi.org/10.1117/12.2553001
Event: SPIE BiOS, 2020, San Francisco, California, United States

Abstract

CdSe_xS_1-x/ZnS quantum dots (QDs) can cover a broader spectral range than the commonly used CdSe/ZnS QDs and are potentially useful as biomarkers for tagging cell lines such as HeLa, A549, and MCF-7 due to their high photoluminescence intensity and stability in solution. So far, there have been few studies of colloidal CdSe_xS_1-x/ZnS QDs that would simultaneously investigate changes in a) the molar composition of QD cores, and b) the shell thickness, as well as the effects of these changes on the photoluminescence and quantum yield properties of the QDs. CdSe_yS_1-y QDs and CdSe_xS_1-x/ZnS core/shell QDs were synthesized via a previously reported and modified hot-injection procedure and via a telescoping one-pot synthesis based on the modified hot-injection procedure. Size, morphology, composition, and colloidal stability of these QD core/shell systems is reported with data obtained from TEM, XRD, TGA, DSC, DLS, and zeta potential techniques. Optical characterization is described using data collected from UV-Vis absorption spectrophotometry and photoluminescence spectroscopy.

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Mark V. Reymatias, Arjun Senthil, Dominic Bosomtwi, Shruti I. Gharde, Gema J. Alas, DeYannah J. Walker, Adreanna G. Rael, Nhi Nguyen, Nathan J. Withers, Sergei A. Ivanov, John Watt, Dale L. Huber, and Marek Osiński "Synthesis and characterization of colloidal CdSe_xS_1-x/ZnS quantum dots", Proc. SPIE 11255, Colloidal Nanoparticles for Biomedical Applications XV, 1125506 (16 March 2020); https://doi.org/10.1117/12.2553001

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