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

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Martins, CSM (Author) Other; Silva, AL (Author) Other; de Gouveia, LP (Author) Other; Çaha, I (Author) Other; Bondarchuk, O (Author) Other; LaGrow, AP (Author) Other; Deepak, FL (Author) Other; Joao A V Prior (Author) FFUP

Journal

The Journal is awaiting validation by the Administrative Services.

Title: CHEMOSENSORS

Vol. 12

Final page: 70

ISSN: 2227-9040

Indexing

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Other information

Authenticus ID: P-010-D8J

DOI: 10.3390/chemosensors12040070

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