Carbon Dots: Síntese, caracterização e produção de filme fluorescente para aplicação em termometria
Carbon Dots: Síntese, caracterização e produção de filme fluorescente para aplicação em termometria
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DOI: https://doi.org/10.22533/at.ed.1232517105
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Palavras-chave: Nanopartícula, luminescência, nanotermômetro.
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Keywords: Nanoparticle, luminescence, nanothermometer.
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Abstract: Carbon Dots (CDs) have gained prominence in recent years due to their visible-spectrum luminescence, biocompatibility, sustainable syntheses, and potential sensitivity to temperature variations. In this context, the present work aimed to synthesize Carbon Dots for the production of a fluorescent film and to evaluate their potential as a temperature sensor. The CDs were obtained from red bell pepper using a hydrothermal method (CD-PV), and the fluorescent film was produced by incorporating CD-PV into PVA (polyvinyl alcohol) (F/CD-PV). As a result, the synthesized CDs exhibited sizes below 10 nm, with an average distribution of 1.55 ± 0.39 nm. FTIR analysis indicated the presence of oxygen-containing and nitrogen-containing groups on their surface, characteristic of red bell pepper. Additionally, they showed excitation-wavelength-dependent emission, with maximum intensity in the blue region at 448 nm under 360 nm excitation. The F/CD-PV fluorescent film presented good flexibility and transparency, preserved the luminescent properties of CD-PV, and exhibited a maximum relative thermal sensitivity of 0.80 % K⁻¹ at 343 K. Therefore, the results presented in this work point to promising prospects in the field of luminescent thermometry.
- Livia Elias da Silva
- Orlando Lucas De Lima Calado
- Islaine Elí Lima Gomes
- Rodrigo Da Silva Viana
- Cintya D' Angeles do Espirito Santo Barbosa