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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2024

Autores

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

Revista

A Revista está pendente de validação pelos Serviços Administrativos.

Título: CHEMOSENSORS

Vol. 12

Página Final: 70

Indexação

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Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 22