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Changes in the optical properties of CdSTe QDs in artificial seawater and accumulation in Artemia salina

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Abstract

The key to the success of quantum dots (QDs) within industrial applications is their optical properties. The broad applications of QDs emission wavelengths based on the crystal size can change when they are exposed to different environments like seawater. CdSTe QDs were synthesized in a microwave system at 60, 120, 150, and 180 °C producing different crystal sizes that fluoresce blue (510 nm), green (538 nm), yellow (566 nm), and red (636 nm), respectively. A redshift of the fluorescence indicating possible agglomeration or increase in the crystal size was observed in artificial seawater (40 g/L). Also, a broadening of the emission peaks for the smallest crystals was observed when the CdSTe QDs were in contact with artificial seawater for 72 h. When A. salina was exposed to CdSTe QDs in artificial seawater, an ingest without loss of fluorescence was observed using fluorescence microscopy. The highest cadmium accumulation (2.2 mg/Kg) into A. salina was observed with the largest crystal synthesized at 180 °C, indicating an effect of the crystal size. The small changes and not quenching of the fluorescence in artificial seawater help to understand the behavior of QDs in extreme environments and their applications for photocatalysis in salty environments.

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Acknowledgments

The research reported in this publication was supported by an Institutional Development Award (IDeA) from the National Institute of General Medical Sciences of the National Institutes of Health under Grant Number P20 GM103475. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. TEM work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779* and the State of Florida. We thank Dr. Monica Arroyo and Dr. Dallas E. Alston for editing the manuscript.

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  1. Department of Natural Sciences, Pontifical Catholic University of Puerto Rico at Ponce, Puerto Rico, USA

    Luis Alamo-Nole, Glorimar Rivera-Rodriguez & Lizette Santos-Santori

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  1. Luis Alamo-Nole
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  2. Glorimar Rivera-Rodriguez
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  3. Lizette Santos-Santori
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Correspondence to Luis Alamo-Nole.

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Alamo-Nole, L., Rivera-Rodriguez, G. & Santos-Santori, L. Changes in the optical properties of CdSTe QDs in artificial seawater and accumulation in Artemia salina. MRS Advances 6, 291–296 (2021). https://doi.org/10.1557/s43580-021-00013-4

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