The synthesis of modified carbon dots (N-CDs) from nanocrystalline cellulose, as the carbon source, with the combination of urea and ethylenediamine, as nitrogen dopant agents, was successfully carried out by pyrolysis at 300 °C. The N-CDs dispersed in both ethanol and distilled water generated bright blue fluorescent color under a UV lamp at 365 nm wavelength with a 29% quantum yield value. FTIR analysis confirmed that the surfaces of carbon dots were modified by amine and N-doped groups on the carbon ring structure and the data from the UV-VIS spectrum also showed that assumption. Produced N-CDs had a size distribution of 2-5 nm with an average diameter of around 3.4 nm. The ability of N-CDs as a detector was explored from the fluorescence quenching by Hg 2+ ions, in which it reached 40%. The determination of Hg 2+ could be completed in 10 min with a wide linearity range from 0-100 µM and a detection limit of 59 µM by the static quenching process.
Carbon nanodots (CDots) are nanoparticles that can be synthesized from various carbon sources. In synthesizing the Dots by using carbon source from oil palm empty fruit as raw material, cellulose could become a potential source. Cellulose nanocrystals were utilized as precursors, and the Cdots were obtained by using microwave method. In this study, CDots synthesis using microwave method has been successfully done. From FTIR analysis, cellulose isolated from oil palm empty fruit showed functional groups which corresponded to neat cellulose. And for TEM analysis showed rod forms needles arranged variously, and they have diameter length about 10, 9nm. The physical properties of Cdotswere obtained in the most optimum parameters during the conditions of 1000 watts for 20 minutes. The obtained results were dark brown colour with green-to-blue fluorescent under UV light source. From this study, it can be concluded that CDots can be synthesized from cellulose nanocrystals.
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