Optical and structural characterization of tomato-based carbon quantum dots (lycopersicon esculentum Mill)
DOI:
https://doi.org/10.5377/ryr.v1i57.16706Keywords:
tomato, carbon quantum dots, carbonization, photoluminescence, absorption, electron microscopyAbstract
Carbon quantum dots possess attractive optical and electronic properties for different applications, for example, in biological markers, illumination and solar cells. In the present study it is reported the synthesis of these quantum dots by direct carbonization of tomato and their characterization using scanning electron microscopy, X-ray energy dispersive and optical spectroscopy. The scanning electron microscopy images show quantum dot sizes between 20 nm and 60 nm. In the absorption spectra, a predominant band at 275 nm attributed to transitions associated with functional groups and π-π* transitions of C=C bonds and n-π* transitions of C=O bonds has been observed. On the other hand, at least four bands were observed in the photoluminescence spectra, with maxima around 650 nm, 580 nm, 560 nm and 500 nm. This multiband emission could be associated, preliminarily, to transitions of silicon, sulfur and potassium traces that have been observed by energy dispersive X-ray in the different samples.
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Instituto de Ciencia, Tecnología e Innovación (ICTI)
Reality and Reflection
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