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Controlling Fluorescence Wavelength in the Synthesis of TGA-Capped CdTe Quantum Dots

Title
Controlling Fluorescence Wavelength in the Synthesis of TGA-Capped CdTe Quantum Dots
Type
Article in International Scientific Journal
Year
2024
Authors
Martins, CSM
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Silva, AL
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de Gouveia, LP
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Çaha, I
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Bondarchuk, O
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LaGrow, AP
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Deepak, FL
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Joao A V Prior
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Title: CHEMOSENSORSImported from Authenticus Search for Journal Publications
Vol. 12
Final page: 70
ISSN: 2227-9040
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Publicação em ISI Web of Knowledge ISI Web of Knowledge - 0 Citations
Publicação em Scopus Scopus - 0 Citations
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Authenticus ID: P-010-D8J
Abstract (EN): Quantum dots (QDs) are semiconductor materials, with a size range between 1-10 nm, showcasing unique size-dependent physical and chemical properties. Such properties have potentiated their use in areas like medical imaging and biosensing. Herein, we present an open-air approach for synthesis of QDs, reducing the need for controllable atmospheric conditions. Furthermore, we present a predictive mathematical model for maximum emission wavelength (lambda max) control. Through a straightforward microwave-based aqueous synthesis of TGA-CdTe QDs, we investigated the influence of time, temperature, and Te:Cd and TGA:Cd molar ratios on lambda max, using a chemometric experimental design approach. CdTe-QDs were characterized by UV-Vis and fluorescence spectroscopies. Additionally, Fourier-Transform Infrared spectroscopy, X-ray photoelectron spectroscopy, Transmission Electron Microscopy, and Energy Dispersive X-ray were conducted. Stable QDs with fluorescence ranging from green to red (527.6 nm to 629.2 nm) were obtained. A statistical analysis of the results revealed that time and temperature were the most significant factors influencing lambda max. After fine-tuning the variables, a mathematical model with 97.7% of prediction accurately forecasted experimental conditions for synthesizing TGA-CdTe QDs at predefined lambda max. Stability tests demonstrated that the QDs retained their optical characteristics for over a month at 4 degrees C, facilitating diverse applications.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 22
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