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CdSeTe/ZnS quantum dots have gained significant attention in the field of nanotechnology due to their unique optical and electronic properties, making them ideal candidates for a wide range of applications. These quantum dots are semiconductor nanocrystals composed of cadmium selenide telluride (CdSeTe) core and a zinc sulfide (ZnS) shell. In this article, Alfa Chemistry aims to provide a comprehensive overview of the characteristics, synthesis methods, and diverse applications of CdSeTe/ZnS quantum dots.
The synthesis of CdSeTe/ZnS quantum dots typically involves a hot-injection method, where precursors containing the semiconductor materials are rapidly injected into a solvent at elevated temperatures. The reaction parameters such as temperature, precursor concentration, and reaction time can be optimized to control the size, shape, and optical properties of the quantum dots. Ligands such as trioctylphosphine (TOP) and trioctylphosphine oxide (TOPO) are often used to stabilize the quantum dots and prevent aggregation.
The synthesis of CdSeTe/ZnS quantum dots. [1]
Another widely utilized methods is the successive ion layer adsorption and reaction (SILAR) technique. This technique involves the sequential adsorption of Cd, Se, and Te ions onto the core, followed by the deposition of Zn and S ions to form the shell. The SILAR method offers fine control over the shell thickness and composition, resulting in high-quality CdSeTe/ZnS quantum dots with tailored properties.
CdSeTe/ZnS quantum dots have shown promise in biological imaging due to their tunable emission wavelengths, high brightness, and resistance to photobleaching. They are used for labeling and tracking biomolecules, cells, and tissues in biological research and diagnostics.
The potential of CdTeSe/ZnS core-shell quantum dots has been explored in photothermal therapy of cancer. Jin Wang et al. prepared CdTeSe/ZnS core-shell quantum dots through an aqueous phase synthesis method, which have near-infrared output and excellent photothermal properties. The quantum dots can induce apoptosis of liver cancer cell Huh7 under the action of photothermal, thus serving as an exogenous substance for photothermal treatment of cancer.
CdTeSe/ZnS core-shell quantum dots for photothermal therapy. [2]
The exceptional optical properties of CdSeTe/ZnS quantum dots make them suitable for enhancing the color quality and efficiency of LEDs. By incorporating quantum dots into LED designs, improved color rendering, and energy efficiency can be achieved.
CdSeTe/ZnS quantum dots are being explored for their potential in photovoltaic devices. Their tunable bandgap and high quantum yield offer opportunities for enhancing the performance of solar cells and expanding the range of light absorption.
The sensitivity and tunable emission of CdSeTe/ZnS quantum dots make them valuable in sensor and detector technologies. They are employed in environmental monitoring, chemical sensing, biosensing, and optoelectronic sensor devices. Alasdair J. Stewart et al. developed a near-infrared electroluminescence sensor based on water-soluble CdSeTe/ZnS quantum dots. The sensor shows a linear response to cholesterol within the detection limit, thereby providing a platform for the development of rapid cholesterol detection.
CdSeTe/ZnS QDs-based cholesterol biosensor. [3]
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