Publication:
Tunable carbon quantum Dots from starch via microwave assisted carbonization
Tunable carbon quantum Dots from starch via microwave assisted carbonization
Date
2017-01
Authors
L. A. Adams
K. A. Fagbenro-Owoseni
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Volume Title
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Research Projects
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Abstract
Tunable luminescence carbon dots (C-dots) were prepared through microwaveassisted carbonization of aqueous starch suspension mediated by sulfuric and phosphoric acids respectively as surface passivating agents. The as-prepared C-dots showed green, blue and yellow luminescence under 365nm UV light. The C-dots were further characterized by UV-Vis, FTIR, and band gap determination. Fourier transform infrared spectroscopy (FTIR) studies revealed bands at 3460 cm-1 (OH), 2979 cm-1 1708 cm-1 (C=O), 1188 and 1040cm-1 (C-O), and 1397 cm-1 (C=C) indicative of the graphitic nature of the carbon. The UV-Vis showed blue shifted absorption bands, while the band gap calculated revealed narrow sizing of the C-dots in the semiconductor range. The results suggest that this approach may serve as a facile route to colour tunable photoluminescent C-dot materials with potential biological applications.
Description
Keywords
Carbon quantum dots,
Semiconductor,
Starch,
Microwave,
Luminescence